diff --git a/java/google/registry/env/alpha/default/WEB-INF/cron.xml b/java/google/registry/env/alpha/default/WEB-INF/cron.xml
index 4f4eb8d3c..6acb5a4f8 100644
--- a/java/google/registry/env/alpha/default/WEB-INF/cron.xml
+++ b/java/google/registry/env/alpha/default/WEB-INF/cron.xml
@@ -166,5 +166,14 @@
     <target>backend</target>
   </cron>
 
+  <cron>
+    <url><![CDATA[/_ah/sessioncleanup?clear]]></url>
+    <description>
+      Delete up to 100 expired _ah_SESSION entities from Datastore.
+    </description>
+    <schedule>every 15 minutes</schedule>
+    <target>backend</target>
+  </cron>
+
 
 </cronentries>
diff --git a/java/google/registry/env/sandbox/default/WEB-INF/cron.xml b/java/google/registry/env/sandbox/default/WEB-INF/cron.xml
index f15851fb8..e0a87d532 100644
--- a/java/google/registry/env/sandbox/default/WEB-INF/cron.xml
+++ b/java/google/registry/env/sandbox/default/WEB-INF/cron.xml
@@ -142,5 +142,14 @@
   </cron>
   -->
 
+  <cron>
+    <url><![CDATA[/_ah/sessioncleanup?clear]]></url>
+    <description>
+      Delete up to 100 expired _ah_SESSION entities from Datastore.
+    </description>
+    <schedule>every 15 minutes</schedule>
+    <target>backend</target>
+  </cron>
+
 
 </cronentries>