diff --git a/.kokoro/release/publish.cfg b/.kokoro/release/publish.cfg
index e30e0fb..1a1ae90 100644
--- a/.kokoro/release/publish.cfg
+++ b/.kokoro/release/publish.cfg
@@ -61,7 +61,7 @@ build_file: "nodejs-recaptcha-enterprise/.kokoro/trampoline.sh"
 # Configure the docker image for kokoro-trampoline.
 env_vars: {
     key: "TRAMPOLINE_IMAGE"
-    value: "gcr.io/cloud-devrel-kokoro-resources/node:8-user"
+    value: "gcr.io/cloud-devrel-kokoro-resources/node:12-user"
 }
 
 env_vars: {
diff --git a/synth.metadata b/synth.metadata
index 0b88b41..6b86c56 100644
--- a/synth.metadata
+++ b/synth.metadata
@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-recaptcha-enterprise.git",
-        "sha": "1efffc85e021059dd0eeb3d95cc5388f61a325f7"
+        "sha": "4b6b88d44dac12131d6ca322cd240fd7b4ab57da"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "bd0deaa1113b588d70449535ab9cbf0f2bd0e72f"
+        "sha": "5747555f7620113d9a2078a48f4c047a99d31b3e"
       }
     }
   ],