diff --git a/java/google/registry/env/alpha/default/WEB-INF/appengine-web.xml b/java/google/registry/env/alpha/default/WEB-INF/appengine-web.xml
index da59be7d3..932dfc3af 100644
--- a/java/google/registry/env/alpha/default/WEB-INF/appengine-web.xml
+++ b/java/google/registry/env/alpha/default/WEB-INF/appengine-web.xml
@@ -8,7 +8,7 @@
   <sessions-enabled>true</sessions-enabled>
   <instance-class>B4</instance-class>
   <basic-scaling>
-    <max-instances>8</max-instances>
+    <max-instances>4</max-instances>
     <idle-timeout>10m</idle-timeout>
   </basic-scaling>
 
diff --git a/java/google/registry/env/sandbox/default/WEB-INF/appengine-web.xml b/java/google/registry/env/sandbox/default/WEB-INF/appengine-web.xml
index 0f8942ebe..16257498e 100644
--- a/java/google/registry/env/sandbox/default/WEB-INF/appengine-web.xml
+++ b/java/google/registry/env/sandbox/default/WEB-INF/appengine-web.xml
@@ -8,7 +8,7 @@
   <sessions-enabled>true</sessions-enabled>
   <instance-class>B4</instance-class>
   <basic-scaling>
-    <max-instances>8</max-instances>
+    <max-instances>4</max-instances>
     <idle-timeout>10m</idle-timeout>
   </basic-scaling>