diff --git a/pom.xml b/pom.xml
index ca03c3d2a..458ab4ba3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -561,7 +561,7 @@
       - Internally, update the default features.json file
     -->
     <project.http-client.version>1.41.7</project.http-client.version><!-- {x-version-update:google-http-client-parent:current} -->
-    <project.appengine.version>2.0.4</project.appengine.version>
+    <project.appengine.version>1.9.96</project.appengine.version>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.jsr305.version>3.0.2</project.jsr305.version>
     <project.gson.version>2.9.0</project.gson.version>