diff --git a/pom.xml b/pom.xml
index 09b8ad201..4e1799a26 100644
--- a/pom.xml
+++ b/pom.xml
@@ -437,7 +437,7 @@
       - google-api-java-client/google-api-client-assembly/android-properties (make the filenames match the version here)
       - Internally, update the default features.json file
     -->
-    <project.appengine.version>1.9.77</project.appengine.version>
+    <project.appengine.version>1.9.78</project.appengine.version>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.http.version>1.34.2</project.http.version>
     <project.jsr305.version>3.0.2</project.jsr305.version>