diff --git a/project.clj b/project.clj
index e3d372f..e02c3e6 100644
--- a/project.clj
+++ b/project.clj
@@ -4,12 +4,12 @@
   :license {:name "Eclipse Public License"
             :url "http://www.eclipse.org/legal/epl-v10.html"}
   :eval-in :leiningen
-  :plugins [[thomasa/mranderson "0.4.6"]]
+  :plugins [[thomasa/mranderson "0.4.7-SNAPSHOT"]]
   :java-source-paths ["java-src"]
   :javac-options ["-target" "1.6" "-source" "1.6"]
   :filespecs [{:type :bytes :path "mranderson/project.clj" :bytes ~(slurp "project.clj")}]
   :dependencies [^:source-dep [com.cemerick/pomegranate "0.3.0"]
-                 ^:source-dep [org.clojure/tools.namespace "0.2.11"]
+                 ^:source-dep [org.clojure/tools.namespace "0.3.0-alpha3"]
                  ^:source-dep [me.raynes/fs "1.4.6"]
                  [com.googlecode.jarjar/jarjar "1.3"]]
   :profiles {:dev {:dependencies [[org.clojure/clojure "1.7.0"]]}})
diff --git a/src/leiningen/source_deps.clj b/src/leiningen/source_deps.clj
index 8904c59..cd9998f 100644
--- a/src/leiningen/source_deps.clj
+++ b/src/leiningen/source_deps.clj
@@ -14,8 +14,6 @@
 
 (defn- zip-target-file
   [target-dir entry-path]
-  ;; remove leading slash in case some bonehead created a zip with absolute
-  ;; file paths in it.
   (let [entry-path (str/replace-first (str entry-path) #"^/" "")]
     (fs/file target-dir entry-path)))
 
@@ -33,7 +31,9 @@
      (->> entries
           (filter #(not (.isDirectory ^java.util.zip.ZipEntry %)))
           (map #(.getName %))
-          (filter #(or (.endsWith % ".clj") (.endsWith % ".cljc")))))))
+          (filter #(or (.endsWith % ".clj")
+                       (.endsWith % ".cljc")
+                       (.endsWith % ".cljs")))))))
 
 (defn- cljfile->prefix [clj-file]
   (->> (str/split clj-file #"/")
@@ -44,6 +44,7 @@
   (->> clj-files
        (map cljfile->prefix)
        (remove #(str/blank? %))
+       (remove #(= "clojure.core" %))
        (reduce #(if (%1 %2) (assoc %1 %2 (inc (%1 %2))) (assoc %1 %2 1) ) {})
        (filter #(< 1 (val %)))
        (map first)
@@ -256,7 +257,7 @@
             (doseq [file (clojure-source-files [srcdeps])]
               (update-deftypes file old-ns new-deftype)))
           ;; move actual ns-s
-          (move/move-ns old-ns new-ns srcdeps [srcdeps]))
+          (move/move-ns old-ns new-ns srcdeps (file->extension (str clj-file)) [srcdeps]))
         ;; a clj file without ns
         (when-not (= "project.clj" clj-file)
           (let [old-path (str "target/srcdeps/" clj-file)
diff --git a/src/mranderson/move.clj b/src/mranderson/move.clj
index c6fe17d..c7f5836 100644
--- a/src/mranderson/move.clj
+++ b/src/mranderson/move.clj
@@ -21,7 +21,8 @@
 "}
   mranderson.move
   (:require [clojure.string :as str]
-            [clojure.java.io :as io])
+            [clojure.java.io :as io]
+            [mranderson.util :as util])
   (:import (java.io File FileNotFoundException)))
 
 (defn- update-file
@@ -40,26 +41,27 @@
       (str/replace "-" "_")
       (str/replace "." File/separator)))
 
-(defn- find-file-for-sym [path sym]
-  (->> [".clj" ".cljc"]
-       (map #(io/file path (str (sym->file-name sym) %)))
-       (filter #(.exists %))
-       first))
-
 (defn- sym->file
   [path sym extension]
   (io/file path (str (sym->file-name sym) extension)))
 
-(defn- clojure-source-files [dirs]
+(defn- update? [file extension-of-moved]
+  (let [file-ext (util/file->extension file)
+        all-extensions #{".cljc" ".cljs" ".clj"}]
+    (or
+     (and (= ".cljc" extension-of-moved)
+          (all-extensions file-ext))
+     (= file-ext extension-of-moved)
+     (= file-ext ".cljc"))))
+
+(defn- clojure-source-files [dirs extension]
   (->> dirs
        (map io/file)
        (filter #(.exists ^File %))
        (mapcat file-seq)
        (filter (fn [^File file]
                  (and (.isFile file)
-                      (or
-                       (.endsWith (.getName file) ".clj")
-                       (.endsWith (.getName file) ".cljc")))))
+                      (update? (str file) extension))))
        (map #(.getCanonicalFile ^File %))))
 
 (def ^:private symbol-regex
@@ -82,10 +84,6 @@
                      new-name
                      match)))))
 
-(defn- file->extension
-  [file]
-  (re-find #"\.cljc?$" (str file)))
-
 (defn move-ns-file
   "ALPHA: subject to change. Moves the .clj or .cljc source file (found relative
   to source-path) for the namespace named old-sym to a file for a
@@ -93,9 +91,9 @@
 
   WARNING: This function moves and deletes your source files! Make
   sure you have a backup or version control."
-  [old-sym new-sym source-path]
-  (if-let [old-file (find-file-for-sym source-path old-sym)]
-    (let [new-file (sym->file source-path new-sym (file->extension old-file))]
+  [old-sym new-sym extension source-path]
+  (if-let [old-file (sym->file source-path old-sym extension)]
+    (let [new-file (sym->file source-path new-sym extension)]
       (.mkdirs (.getParentFile new-file))
       (io/copy old-file new-file)
       (.delete old-file)
@@ -116,7 +114,7 @@
 
   WARNING: This function modifies and deletes your source files! Make
   sure you have a backup or version control."
-  [old-sym new-sym source-path dirs]
-  (move-ns-file old-sym new-sym source-path)
-  (doseq [file (clojure-source-files dirs)]
+  [old-sym new-sym source-path extension dirs]
+  (move-ns-file old-sym new-sym extension source-path)
+  (doseq [file (clojure-source-files dirs extension)]
     (update-file file replace-ns-symbol old-sym new-sym)))
diff --git a/src/mranderson/util.clj b/src/mranderson/util.clj
index b344844..2c22dee 100644
--- a/src/mranderson/util.clj
+++ b/src/mranderson/util.clj
@@ -23,6 +23,7 @@
                         (and (.isFile file)
                              (or
                               (.endsWith file-name ".cljc")
+                              (.endsWith file-name ".cljs")
                               (.endsWith file-name ".clj")))))))))
   ([dirs]
      (clojure-source-files-relative dirs nil)))
@@ -113,3 +114,7 @@
     (assert (string? v)
             (str "Something went wrong, version is not a string: " v))
     v))
+
+(defn file->extension
+  [file]
+  (re-find #"\.clj[cs]?$" file))