diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 0f1622f..2ef5018 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -1,5 +1,12 @@
 name: Tests
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
 env:
   CI: true
 
@@ -11,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: [6, 8, 10, 12]
+        node: [8, 10, 12]
 
     steps:
       - name: Clone repository
@@ -26,7 +33,7 @@ jobs:
       - run: npm --version
 
       - name: Install npm dependencies
-        run: npm install # switch to `ci` when Node.js 6.x is dropped
+        run: npm ci
 
       - name: Run tests
         run: npm test
diff --git a/lib/git.js b/lib/git.js
index aa1bd35..b1003e4 100644
--- a/lib/git.js
+++ b/lib/git.js
@@ -1,9 +1,7 @@
 const cp = require('child_process');
 const path = require('path');
 const util = require('util');
-
-const Q = require('q');
-const fs = require('q-io/fs');
+const fse = require('fs-extra');
 
 let git = 'git';
 
@@ -26,9 +24,8 @@ util.inherits(ProcessError, Error);
  * Execute a git command.
  * @param {Array.<string>} args Arguments (e.g. ['remote', 'update']).
  * @param {string} cwd Repository directory.
- * @return {Promise} A promise.  The promise will be resolved with the exit code
- *     or rejected with an error.  To get stdout, use a progress listener (e.g.
- *     `promise.progress(function(chunk) {console.log(String(chunk);}))`).
+ * @return {Promise} A promise.  The promise will be resolved with stdout as a string
+ *     or rejected with an error.
  */
 exports = module.exports = function(args, cwd) {
   return spawn(git, args, cwd);
@@ -50,24 +47,26 @@ exports.exe = function(exe) {
  * @return {Promise} A promise.
  */
 function spawn(exe, args, cwd) {
-  const deferred = Q.defer();
-  const child = cp.spawn(exe, args, {cwd: cwd || process.cwd()});
-  const buffer = [];
-  child.stderr.on('data', chunk => {
-    buffer.push(chunk.toString());
-  });
-  child.stdout.on('data', chunk => {
-    deferred.notify(chunk);
-  });
-  child.on('close', code => {
-    if (code) {
-      const msg = buffer.join('') || `Process failed: ${code}`;
-      deferred.reject(new ProcessError(code, msg));
-    } else {
-      deferred.resolve(code);
-    }
+  const promise = new Promise((resolve, reject) => {
+    const child = cp.spawn(exe, args, {cwd: cwd || process.cwd()});
+    const stderrBuffer = [];
+    const stdoutBuffer = [];
+    child.stderr.on('data', chunk => {
+      stderrBuffer.push(chunk.toString());
+    });
+    child.stdout.on('data', chunk => {
+      stdoutBuffer.push(chunk.toString());
+    });
+    child.on('close', code => {
+      if (code) {
+        const msg = stderrBuffer.join('') || `Process failed: ${code}`;
+        reject(new ProcessError(code, msg));
+      } else {
+        resolve(stdoutBuffer.join(''));
+      }
+    });
   });
-  return deferred.promise;
+  return promise;
 }
 
 /**
@@ -88,16 +87,16 @@ exports.init = function init(cwd) {
  * @return {Promise} A promise.
  */
 exports.clone = function clone(repo, dir, branch, options) {
-  return fs.exists(dir).then(exists => {
+  return fse.pathExists(dir).then(exists => {
     if (exists) {
-      return Q.resolve();
+      return Promise.resolve();
     }
-    return fs.makeTree(path.dirname(path.resolve(dir))).then(() => {
+    return fse.ensureDir(path.dirname(path.resolve(dir))).then(() => {
       const args = ['clone', repo, dir, '--branch', branch, '--single-branch'];
       if (options.depth) {
         args.push('--depth', options.depth);
       }
-      return spawn(git, args).fail(err => {
+      return spawn(git, args).catch(err => {
         // try again without branch options
         return spawn(git, ['clone', repo, dir]);
       });
@@ -161,7 +160,7 @@ exports.checkout = function checkout(remote, branch, cwd) {
         return spawn(git, ['checkout', '--orphan', branch], cwd);
       }
       // unhandled error
-      return Q.reject(error);
+      return Promise.reject(error);
     }
   );
 };
@@ -196,9 +195,9 @@ exports.commit = function commit(message, cwd) {
   return spawn(git, ['diff-index', '--quiet', 'HEAD', '.'], cwd)
     .then(() => {
       // nothing to commit
-      return Q.resolve();
+      return Promise.resolve();
     })
-    .fail(() => {
+    .catch(() => {
       return spawn(git, ['commit', '-m', message], cwd);
     });
 };
diff --git a/lib/util.js b/lib/util.js
index ece8155..cf4675a 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -1,7 +1,6 @@
 const path = require('path');
 const async = require('async');
 const fs = require('graceful-fs');
-const Q = require('q');
 
 /**
  * Generate a list of unique directory paths given a list of file paths.
@@ -126,32 +125,32 @@ function makeDir(path, callback) {
  * @return {Promise} A promise.
  */
 exports.copy = function(files, base, dest) {
-  const deferred = Q.defer();
-
-  const pairs = [];
-  const destFiles = [];
-  files.forEach(file => {
-    const src = path.resolve(base, file);
-    const relative = path.relative(base, src);
-    const target = path.join(dest, relative);
-    pairs.push({
-      src,
-      dest: target
+  const promise = new Promise((resolve, reject) => {
+    const pairs = [];
+    const destFiles = [];
+    files.forEach(file => {
+      const src = path.resolve(base, file);
+      const relative = path.relative(base, src);
+      const target = path.join(dest, relative);
+      pairs.push({
+        src,
+        dest: target
+      });
+      destFiles.push(target);
     });
-    destFiles.push(target);
-  });
 
-  async.eachSeries(dirsToCreate(destFiles), makeDir, err => {
-    if (err) {
-      return deferred.reject(err);
-    }
-    async.each(pairs, copyFile, err => {
+    async.eachSeries(dirsToCreate(destFiles), makeDir, err => {
       if (err) {
-        return deferred.reject(err);
+        return reject(err);
       }
-      return deferred.resolve();
+      async.each(pairs, copyFile, err => {
+        if (err) {
+          return reject(err);
+        }
+        return resolve();
+      });
     });
   });
 
-  return deferred.promise;
+  return promise;
 };
diff --git a/package-lock.json b/package-lock.json
index 7c80b79..14b7fe1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -81,6 +81,16 @@
         "color-convert": "^1.9.0"
       }
     },
+    "anymatch": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.1.tgz",
+      "integrity": "sha512-mM8522psRCqzV+6LhomX5wgp25YVibjh8Wj23I5RPkPppSVSjyKD2A2mBJmWGa+KN7f2D6LNh9jkBCeyLktzjg==",
+      "dev": true,
+      "requires": {
+        "normalize-path": "^3.0.0",
+        "picomatch": "^2.0.4"
+      }
+    },
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
@@ -90,30 +100,6 @@
         "sprintf-js": "~1.0.2"
       }
     },
-    "arr-diff": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
-      "integrity": "sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA=",
-      "dev": true
-    },
-    "arr-flatten": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
-      "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg==",
-      "dev": true
-    },
-    "arr-union": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/arr-union/-/arr-union-3.1.0.tgz",
-      "integrity": "sha1-45sJrqne+Gao8gbiiK9jkZuuOcQ=",
-      "dev": true
-    },
-    "array-each": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/array-each/-/array-each-1.0.1.tgz",
-      "integrity": "sha1-p5SvDAWrF1KEbudTofIRoFugxE8=",
-      "dev": true
-    },
     "array-find-index": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/array-find-index/-/array-find-index-1.0.2.tgz",
@@ -131,18 +117,6 @@
         "is-string": "^1.0.5"
       }
     },
-    "array-slice": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/array-slice/-/array-slice-1.1.0.tgz",
-      "integrity": "sha512-B1qMD3RBP7O8o0H2KbrXDyB0IccejMF15+87Lvlor12ONPRHP6gTjXMNkt/d3ZuOGbAe66hFmaCfECI24Ufp6w==",
-      "dev": true
-    },
-    "array-unique": {
-      "version": "0.3.2",
-      "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.3.2.tgz",
-      "integrity": "sha1-qJS3XUvE9s1nnvMkSp/Y9Gri1Cg=",
-      "dev": true
-    },
     "array.prototype.flat": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/array.prototype.flat/-/array.prototype.flat-1.2.3.tgz",
@@ -159,12 +133,6 @@
       "integrity": "sha512-jgsaNduz+ndvGyFt3uSuWqvy4lCnIJiovtouQN5JZHOKCS2QuhEdbcQHFhVksz2N2U9hXJo8odG7ETyWlEeuDw==",
       "dev": true
     },
-    "assign-symbols": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/assign-symbols/-/assign-symbols-1.0.0.tgz",
-      "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
-      "dev": true
-    },
     "astral-regex": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/astral-regex/-/astral-regex-1.0.0.tgz",
@@ -176,72 +144,17 @@
       "resolved": "https://registry.npmjs.org/async/-/async-3.2.0.tgz",
       "integrity": "sha512-TR2mEZFVOj2pLStYxLht7TyfuRzaydfpxr3k9RpHIzMgw7A64dzsdqCxH1WJyQdoe8T10nDXd9wnEigmiuHIZw=="
     },
-    "atob": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/atob/-/atob-2.1.2.tgz",
-      "integrity": "sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==",
-      "dev": true
-    },
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
       "dev": true
     },
-    "base": {
-      "version": "0.11.2",
-      "resolved": "https://registry.npmjs.org/base/-/base-0.11.2.tgz",
-      "integrity": "sha512-5T6P4xPgpp0YDFvSWwEZ4NoE3aM4QBQXDzmVbraCkFj8zHM+mba8SyqB5DbZWyR7mYHo6Y7BdQo3MoA4m0TeQg==",
-      "dev": true,
-      "requires": {
-        "cache-base": "^1.0.1",
-        "class-utils": "^0.3.5",
-        "component-emitter": "^1.2.1",
-        "define-property": "^1.0.0",
-        "isobject": "^3.0.1",
-        "mixin-deep": "^1.2.0",
-        "pascalcase": "^0.1.1"
-      },
-      "dependencies": {
-        "define-property": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/define-property/-/define-property-1.0.0.tgz",
-          "integrity": "sha1-dp66rz9KY6rTr56NMEybvnm/sOY=",
-          "dev": true,
-          "requires": {
-            "is-descriptor": "^1.0.0"
-          }
-        },
-        "is-accessor-descriptor": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-1.0.0.tgz",
-          "integrity": "sha512-m5hnHTkcVsPfqx3AKlyttIPb7J+XykHvJP2B9bZDjlhLIoEq4XoK64Vg7boZlVWYK6LUY94dYPEE7Lh0ZkZKcQ==",
-          "dev": true,
-          "requires": {
-            "kind-of": "^6.0.0"
-          }
-        },
-        "is-data-descriptor": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/is-data-descriptor/-/is-data-descriptor-1.0.0.tgz",
-          "integrity": "sha512-jbRXy1FmtAoCjQkVmIVYwuuqDFUbaOeDjmed1tOGPrsMhtJA4rD9tkgA0F1qJ3gRFRXcHYVkdeaP50Q5rE/jLQ==",
-          "dev": true,
-          "requires": {
-            "kind-of": "^6.0.0"
-          }
-        },
-        "is-descriptor": {
-          "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/is-descriptor/-/is-descriptor-1.0.2.tgz",
-          "integrity": "sha512-2eis5WqQGV7peooDyLmNEPUrps9+SXX5c9pL3xEB+4e9HnGuDa7mB7kHxHw4CbqS9k1T2hOH3miL8n8WtiYVtg==",
-          "dev": true,
-          "requires": {
-            "is-accessor-descriptor": "^1.0.0",
-            "is-data-descriptor": "^1.0.0",
-            "kind-of": "^6.0.2"
-          }
-        }
-      }
+    "binary-extensions": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.0.0.tgz",
+      "integrity": "sha512-Phlt0plgpIIBOGTT/ehfFnbNlfsDEiqmzE2KRXoX1bLIlir4X/MR+zSyBEkL05ffWgnRSf/DXv+WrUAVr93/ow==",
+      "dev": true
     },
     "body": {
       "version": "5.1.0",
@@ -265,35 +178,6 @@
         "concat-map": "0.0.1"
       }
     },
-    "braces": {
-      "version": "2.3.2",
-      "resolved": "https://registry.npmjs.org/braces/-/braces-2.3.2.tgz",
-      "integrity": "sha512-aNdbnj9P8PjdXU4ybaWLK2IF3jc/EoDYbC7AazW6to3TRsfXxscC9UXOB5iDiEQrkyIbWp2SLQda4+QAa7nc3w==",
-      "dev": true,
-      "requires": {
-        "arr-flatten": "^1.1.0",
-        "array-unique": "^0.3.2",
-        "extend-shallow": "^2.0.1",
-        "fill-range": "^4.0.0",
-        "isobject": "^3.0.1",
-        "repeat-element": "^1.1.2",
-        "snapdragon": "^0.8.1",
-        "snapdragon-node": "^2.0.1",
-        "split-string": "^3.0.2",
-        "to-regex": "^3.0.1"
-      },
-      "dependencies": {
-        "extend-shallow": {
-          "version": "2.0.1",
-          "resolved": "https://registry.npmjs.org/extend-shallow/-/extend-shallow-2.0.1.tgz",
-          "integrity": "sha1-Ua99YUrZqfYQ6huvu5idaxxWiQ8=",
-          "dev": true,
-          "requires": {
-            "is-extendable": "^0.1.0"
-          }
-        }
-      }
-    },
     "browser-stdout": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
@@ -306,23 +190,6 @@
       "integrity": "sha1-NWnt6Lo0MV+rmcPpLLBMciDeH6g=",
       "dev": true
     },
-    "cache-base": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/cache-base/-/cache-base-1.0.1.tgz",
-      "integrity": "sha512-AKcdTnFSWATd5/GCPRxr2ChwIJ85CeyrEyjRHlKxQ56d4XJMGym0uAiKn0xbLOGOl3+yRpOTi484dVCEc5AUzQ==",
-      "dev": true,
-      "requires": {
-        "collection-visit": "^1.0.0",
-        "component-emitter": "^1.2.1",
-        "get-value": "^2.0.6",
-        "has-value": "^1.0.0",
-        "isobject": "^3.0.1",
-        "set-value": "^2.0.0",
-        "to-object-path": "^0.3.0",
-        "union-value": "^1.0.0",
-        "unset-value": "^1.0.0"
-      }
-    },
     "callsites": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
@@ -382,25 +249,62 @@
       "integrity": "sha1-V00xLt2Iu13YkS6Sht1sCu1KrII=",
       "dev": true
     },
-    "class-utils": {
-      "version": "0.3.6",
-      "resolved": "https://registry.npmjs.org/class-utils/-/class-utils-0.3.6.tgz",
-      "integrity": "sha512-qOhPa/Fj7s6TY8H8esGu5QNpMMQxz79h+urzrNYN6mn+9BnxlDGf5QZ+XeCDsxSjPqsSR56XOZOJmpeurnLMeg==",
+    "chokidar": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.3.0.tgz",
+      "integrity": "sha512-dGmKLDdT3Gdl7fBUe8XK+gAtGmzy5Fn0XkkWQuYxGIgWVPPse2CxFA5mtrlD0TOHaHjEUqkWNyP1XdHoJES/4A==",
       "dev": true,
       "requires": {
-        "arr-union": "^3.1.0",
-        "define-property": "^0.2.5",
-        "isobject": "^3.0.0",
-        "static-extend": "^0.1.1"
+        "anymatch": "~3.1.1",
+        "braces": "~3.0.2",
+        "fsevents": "~2.1.1",
+        "glob-parent": "~5.1.0",
+        "is-binary-path": "~2.1.0",
+        "is-glob": "~4.0.1",
+        "normalize-path": "~3.0.0",
+        "readdirp": "~3.2.0"
       },
       "dependencies": {
-        "define-property": {
-          "version": "0.2.5",
-          "resolved": "https://registry.npmjs.org/define-property/-/define-property-0.2.5.tgz",
-          "integrity": "sha1-w1se+RjsPJkPmlvFe+BKrOxcgRY=",
+        "braces": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
+          "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
+          "dev": true,
+          "requires": {
+            "fill-range": "^7.0.1"
+          }
+        },
+        "fill-range": {
+          "version": "7.0.1",
+          "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
+          "integrity": "sha512-qOo9F+dMUmC2Lcb4BbVvnKJxTPjCm+RRpe4gDuGrzkL7mEVl/djYSu2OdQ2Pa302N4oqkSg9ir6jaLWJ2USVpQ==",
+          "dev": true,
+          "requires": {
+            "to-regex-range": "^5.0.1"
+          }
+        },
+        "is-glob": {
+          "version": "4.0.1",
+          "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-4.0.1.tgz",
+          "integrity": "sha512-5G0tKtBTFImOqDnLB2hG6Bp2qcKEFduo4tZu9MT/H6NQv/ghhy30o55ufafxJ/LdH79LLs2Kfrn85TLKyA7BUg==",
+          "dev": true,
+          "requires": {
+            "is-extglob": "^2.1.1"
+          }
+        },
+        "is-number": {
+          "version": "7.0.0",
+          "resolved": "https://registry.npmjs.org/is-number/-/is-number-7.0.0.tgz",
+          "integrity": "sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng==",
+          "dev": true
+        },
+        "to-regex-range": {
+          "version": "5.0.1",
+          "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
+          "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
           "dev": true,
           "requires": {
-            "is-descriptor": "^0.1.0"
+            "is-number": "^7.0.0"
           }
         }
       }
@@ -465,16 +369,6 @@
       "integrity": "sha1-56qDAZF+9iGzXYo580jc3R234z4=",
       "dev": true
     },
-    "collection-visit": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/collection-visit/-/collection-visit-1.0.0.tgz",
-      "integrity": "sha1-S8A3PBZLwykbTTaMgpzxqApZ3KA=",
-      "dev": true,
-      "requires": {
-        "map-visit": "^1.0.0",
-        "object-visit": "^1.0.0"
-      }
-    },
     "color-convert": {
       "version": "1.9.3",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.3.tgz",
@@ -496,12 +390,6 @@
       "integrity": "sha1-FopHAXVran9RoSzgyXv6KMCE7WM=",
       "dev": true
     },
-    "component-emitter": {
-      "version": "1.3.0",
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-        "has-value": {
-          "version": "0.3.1",
-          "resolved": "https://registry.npmjs.org/has-value/-/has-value-0.3.1.tgz",
-          "integrity": "sha1-ex9YutpiyoJ+wKIHgCVlSEWZXh8=",
-          "dev": true,
-          "requires": {
-            "get-value": "^2.0.3",
-            "has-values": "^0.1.4",
-            "isobject": "^2.0.0"
-          },
-          "dependencies": {
-            "isobject": {
-              "version": "2.1.0",
-              "resolved": "https://registry.npmjs.org/isobject/-/isobject-2.1.0.tgz",
-              "integrity": "sha1-8GVWEJaj8dou9GJy+BXIQNh+DIk=",
-              "dev": true,
-              "requires": {
-                "isarray": "1.0.0"
-              }
-            }
-          }
-        },
-        "has-values": {
-          "version": "0.1.4",
-          "resolved": "https://registry.npmjs.org/has-values/-/has-values-0.1.4.tgz",
-          "integrity": "sha1-bWHeldkd/Km5oCCJrThL/49it3E=",
-          "dev": true
-        }
-      }
-    },
     "uri-js": {
       "version": "4.2.2",
       "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
@@ -3912,43 +2592,17 @@
         "punycode": "^2.1.0"
       }
     },
-    "urix": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
-      "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
-      "dev": true
-    },
     "url-safe": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/url-safe/-/url-safe-2.0.0.tgz",
       "integrity": "sha1-3NRt5GZqdUbuQ+qQasF12qYm3p4="
     },
-    "url2": {
-      "version": "0.0.0",
-      "resolved": "https://registry.npmjs.org/url2/-/url2-0.0.0.tgz",
-      "integrity": "sha1-Tqq9HVw6yQ1iq0SFyZhCKGWgSxo="
-    },
-    "use": {
-      "version": "3.1.1",
-      "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
-      "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
-      "dev": true
-    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
-    "v8flags": {
-      "version": "3.1.3",
-      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.1.3.tgz",
-      "integrity": "sha512-amh9CCg3ZxkzQ48Mhcb8iX7xpAfYJgePHxWMQCBWECpOSqJUXgY26ncA61UTV0BkPqfhcy6mzwCIoP4ygxpW8w==",
-      "dev": true,
-      "requires": {
-        "homedir-polyfill": "^1.0.1"
-      }
-    },
     "validate-npm-package-license": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
@@ -4067,9 +2721,9 @@
       "dev": true
     },
     "yargs": {
-      "version": "13.3.0",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.0.tgz",
-      "integrity": "sha512-2eehun/8ALW8TLoIl7MVaRUrg+yCnenu8B4kBlRxj3GJGDKU1Og7sMXPNm1BYyM1DOJmTZ4YeN/Nwxv+8XJsUA==",
+      "version": "13.3.2",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
+      "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
       "dev": true,
       "requires": {
         "cliui": "^5.0.0",
@@ -4081,7 +2735,7 @@
         "string-width": "^3.0.0",
         "which-module": "^2.0.0",
         "y18n": "^4.0.0",
-        "yargs-parser": "^13.1.1"
+        "yargs-parser": "^13.1.2"
       },
       "dependencies": {
         "ansi-regex": {
@@ -4110,9 +2764,9 @@
           }
         },
         "p-limit": {
-          "version": "2.2.2",
-          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.2.2.tgz",
-          "integrity": "sha512-WGR+xHecKTr7EbUEhyLSh5Dube9JtdiG78ufaeLxTgpudf/20KqyMioIUZJAezlTIi6evxuoUs9YXc11cU+yzQ==",
+          "version": "2.3.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+          "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
           "dev": true,
           "requires": {
             "p-try": "^2.0.0"
@@ -4156,9 +2810,9 @@
       }
     },
     "yargs-parser": {
-      "version": "13.1.1",
-      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz",
-      "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==",
+      "version": "13.1.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
+      "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
       "dev": true,
       "requires": {
         "camelcase": "^5.0.0",
diff --git a/package.json b/package.json
index 39049f7..532a5c4 100644
--- a/package.json
+++ b/package.json
@@ -22,8 +22,6 @@
     "async": "^3.2.0",
     "fs-extra": "^8.1.0",
     "graceful-fs": "^4.2.3",
-    "q": "^1.5.1",
-    "q-io": "^1.13.6",
     "url-safe": "^2.0.0"
   },
   "devDependencies": {
@@ -31,10 +29,9 @@
     "eslint": "^5.16.0",
     "eslint-config-tschaub": "^13.1.0",
     "grunt": "^1.0.3",
-    "grunt-cli": "^1.3.2",
     "grunt-contrib-watch": "^1.1.0",
     "grunt-mocha-test": "^0.13.3",
-    "mocha": "^6.2.2",
+    "mocha": "^7.1.1",
     "tmp": "^0.1.0"
   },
   "peerDependencies": {
diff --git a/tasks/gh-pages.js b/tasks/gh-pages.js
index 84b3f59..6af7f90 100644
--- a/tasks/gh-pages.js
+++ b/tasks/gh-pages.js
@@ -1,6 +1,5 @@
 const path = require('path');
 const fse = require('fs-extra');
-const Q = require('q');
 const urlSafe = require('url-safe');
 const copy = require('../lib/util').copy;
 const git = require('../lib/git');
@@ -11,23 +10,18 @@ function getCacheDir() {
 }
 
 function getRemoteUrl(dir, remote) {
-  let repo;
   return git(['config', '--get', `remote.${remote}.url`], dir)
-    .progress(chunk => {
-      repo = String(chunk)
-        .split(/[\n\r]/)
-        .shift();
-    })
-    .then(() => {
+    .then(data => {
+      const repo = data.split(/[\n\r]/).shift();
       if (repo) {
-        return Q.resolve(repo);
+        return Promise.resolve(repo);
       }
-      return Q.reject(
+      return Promise.reject(
         new Error('Failed to get repo URL from options or current directory.')
       );
     })
-    .fail(err => {
-      return Q.reject(
+    .catch(err => {
+      return Promise.reject(
         new Error(
           'Failed to get remote.origin.url (task must either be run in a ' +
             'git repository with a configured origin remote or must be ' +
@@ -39,7 +33,7 @@ function getRemoteUrl(dir, remote) {
 
 function getRepo(options) {
   if (options.repo) {
-    return Q.resolve(options.repo);
+    return Promise.resolve(options.repo);
   }
   return getRemoteUrl(process.cwd(), 'origin');
 }
@@ -135,9 +129,9 @@ module.exports = function(grunt) {
               `but expected "${repoUrl}" in ${options.clone}.  ` +
               'If you have changed your "repo" option, try ' +
               'running `grunt gh-pages-clean` first.';
-            return Q.reject(new Error(message));
+            return Promise.reject(new Error(message));
           }
-          return Q.resolve();
+          return Promise.resolve();
         });
       })
       .then(() => {
@@ -158,7 +152,7 @@ module.exports = function(grunt) {
           log('Removing files');
           return git.rm(only.join(' '), options.clone);
         }
-        return Q.resolve();
+        return Promise.resolve();
       })
       .then(() => {
         log('Copying files');
@@ -180,7 +174,7 @@ module.exports = function(grunt) {
             );
           });
         }
-        return Q.resolve();
+        return Promise.resolve();
       })
       .then(() => {
         log('Committing');
@@ -189,28 +183,29 @@ module.exports = function(grunt) {
       .then(() => {
         if (options.tag) {
           log('Tagging');
-          const deferred = Q.defer();
-          git
-            .tag(options.tag, options.clone)
-            .then(() => {
-              return deferred.resolve();
-            })
-            .fail(error => {
-              // tagging failed probably because this tag alredy exists
-              log('Tagging failed, continuing');
-              grunt.log.debug(error);
-              return deferred.resolve();
-            });
-          return deferred.promise;
+          const promise = new Promise((resolve, reject) => {
+            git
+              .tag(options.tag, options.clone)
+              .then(() => {
+                return resolve();
+              })
+              .catch(error => {
+                // tagging failed probably because this tag alredy exists
+                log('Tagging failed, continuing');
+                grunt.log.debug(error);
+                return resolve();
+              });
+          });
+          return promise;
         }
-        return Q.resolve();
+        return Promise.resolve();
       })
       .then(() => {
         if (options.push) {
           log('Pushing');
           return git.push(options.remote, options.branch, options.clone);
         }
-        return Q.resolve();
+        return Promise.resolve();
       })
       .then(
         () => {
@@ -223,9 +218,6 @@ module.exports = function(grunt) {
             );
           }
           done(error);
-        },
-        progress => {
-          grunt.verbose.writeln(progress);
         }
       );
   });
diff --git a/test/add.spec.js b/test/add.spec.js
index 3575832..0bc2f93 100644
--- a/test/add.spec.js
+++ b/test/add.spec.js
@@ -41,17 +41,13 @@ describe('add', () => {
   });
 
   it('creates a gh-pages branch', done => {
-    let branch;
     helper
       .git(['rev-parse', '--abbrev-ref', 'HEAD'], repo1)
-      .progress(chunk => {
-        branch = String(chunk);
-      })
-      .then(() => {
+      .then(branch => {
         assert.strictEqual(branch, 'gh-pages\n', 'branch created');
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 
   it('copies source files relative to the base', () => {
@@ -71,7 +67,7 @@ describe('add', () => {
       .then(() => {
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 
   /**
@@ -89,17 +85,13 @@ describe('add', () => {
   });
 
   it('creates a gh-pages branch', done => {
-    let branch;
     helper
       .git(['rev-parse', '--abbrev-ref', 'HEAD'], repo2)
-      .progress(chunk => {
-        branch = String(chunk);
-      })
-      .then(() => {
+      .then(branch => {
         assert.strictEqual(branch, 'gh-pages\n', 'branch created');
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 
   it('overwrites, but does not remove existing', () => {
@@ -123,6 +115,6 @@ describe('add', () => {
       .then(() => {
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 });
diff --git a/test/custom-clone-dir.spec.js b/test/custom-clone-dir.spec.js
index 059eb87..2b5df2c 100644
--- a/test/custom-clone-dir.spec.js
+++ b/test/custom-clone-dir.spec.js
@@ -41,6 +41,6 @@ describe('custom-clone-dir', () => {
       .then(() => {
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 });
diff --git a/test/deep-base.spec.js b/test/deep-base.spec.js
index 84d38ef..b7fc825 100644
--- a/test/deep-base.spec.js
+++ b/test/deep-base.spec.js
@@ -34,17 +34,13 @@ describe('deep-base', () => {
   });
 
   it('creates a gh-pages branch', done => {
-    let branch;
     helper
       .git(['rev-parse', '--abbrev-ref', 'HEAD'], repo)
-      .progress(chunk => {
-        branch = String(chunk);
-      })
-      .then(() => {
+      .then(branch => {
         assert.strictEqual(branch, 'gh-pages\n', 'branch created');
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 
   it('copies source files relative to the base', done => {
@@ -63,6 +59,6 @@ describe('deep-base', () => {
       .then(() => {
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 });
diff --git a/test/deep-clone-dir.spec.js b/test/deep-clone-dir.spec.js
index dd31557..11820af 100644
--- a/test/deep-clone-dir.spec.js
+++ b/test/deep-clone-dir.spec.js
@@ -41,6 +41,6 @@ describe('deep-clone-dir', () => {
       .then(() => {
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 });
diff --git a/test/different-repo.spec.js b/test/different-repo.spec.js
index b3a5842..0172a79 100644
--- a/test/different-repo.spec.js
+++ b/test/different-repo.spec.js
@@ -34,17 +34,13 @@ describe('different-repo', () => {
   });
 
   it('creates a gh-pages branch', done => {
-    let branch;
     helper
       .git(['rev-parse', '--abbrev-ref', 'HEAD'], repo)
-      .progress(chunk => {
-        branch = String(chunk);
-      })
-      .then(() => {
+      .then(branch => {
         assert.strictEqual(branch, 'gh-pages\n', 'branch created');
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 
   it('copies source files', done => {
@@ -74,6 +70,6 @@ describe('different-repo', () => {
       .then(() => {
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 });
diff --git a/test/dotfiles-option.spec.js b/test/dotfiles-option.spec.js
index 83d4143..ae43445 100644
--- a/test/dotfiles-option.spec.js
+++ b/test/dotfiles-option.spec.js
@@ -34,17 +34,13 @@ describe('dotfiles-option', () => {
   });
 
   it('creates a gh-pages branch', done => {
-    let branch;
     helper
       .git(['rev-parse', '--abbrev-ref', 'HEAD'], repo)
-      .progress(chunk => {
-        branch = String(chunk);
-      })
-      .then(() => {
+      .then(branch => {
         assert.strictEqual(branch, 'gh-pages\n', 'branch created');
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 
   it('pushes the gh-pages branch to remote', done => {
@@ -53,7 +49,7 @@ describe('dotfiles-option', () => {
       .then(() => {
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 
   it('copies files with dots', done => {
diff --git a/test/multitask.spec.js b/test/multitask.spec.js
index 3537c65..d9015f0 100644
--- a/test/multitask.spec.js
+++ b/test/multitask.spec.js
@@ -49,7 +49,7 @@ describe('multitask', () => {
       .then(() => {
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 
   it('pushes the branch-two branch to remote', done => {
@@ -58,6 +58,6 @@ describe('multitask', () => {
       .then(() => {
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 });
diff --git a/test/same-repo.spec.js b/test/same-repo.spec.js
index 1bfb943..396a72e 100644
--- a/test/same-repo.spec.js
+++ b/test/same-repo.spec.js
@@ -34,17 +34,13 @@ describe('same-repo', () => {
   });
 
   it('creates a gh-pages branch', done => {
-    let branch;
     helper
       .git(['rev-parse', '--abbrev-ref', 'HEAD'], repo)
-      .progress(chunk => {
-        branch = String(chunk);
-      })
-      .then(() => {
+      .then(branch => {
         assert.strictEqual(branch, 'gh-pages\n', 'branch created');
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 
   it('pushes the gh-pages branch to remote', done => {
@@ -53,6 +49,6 @@ describe('same-repo', () => {
       .then(() => {
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 });
diff --git a/test/unpushed.spec.js b/test/unpushed.spec.js
index 80f98f9..1c88a47 100644
--- a/test/unpushed.spec.js
+++ b/test/unpushed.spec.js
@@ -34,17 +34,13 @@ describe('unpushed', () => {
   });
 
   it('creates a gh-pages branch', done => {
-    let branch;
     helper
       .git(['rev-parse', '--abbrev-ref', 'HEAD'], repo)
-      .progress(chunk => {
-        branch = String(chunk);
-      })
-      .then(() => {
+      .then(branch => {
         assert.strictEqual(branch, 'gh-pages\n', 'branch created');
         done();
       })
-      .fail(done);
+      .catch(done);
   });
 
   it('does not push the gh-pages branch to remote', done => {
@@ -53,7 +49,7 @@ describe('unpushed', () => {
       .then(() => {
         done(new Error('Expected not to find origin/gh-pages'));
       })
-      .fail(() => {
+      .catch(() => {
         // failure on the ls-remote is what we're looking for (no push)
         done();
       });