diff --git a/java/google/registry/env/production/backend/WEB-INF/appengine-web.xml b/java/google/registry/env/production/backend/WEB-INF/appengine-web.xml
index c5a10f8fa..e99978109 100644
--- a/java/google/registry/env/production/backend/WEB-INF/appengine-web.xml
+++ b/java/google/registry/env/production/backend/WEB-INF/appengine-web.xml
@@ -9,7 +9,7 @@
   <sessions-enabled>true</sessions-enabled>
   <instance-class>B4_1G</instance-class>
   <basic-scaling>
-    <max-instances>50</max-instances>
+    <max-instances>100</max-instances>
     <idle-timeout>10m</idle-timeout>
   </basic-scaling>
 
diff --git a/java/google/registry/env/production/default/WEB-INF/appengine-web.xml b/java/google/registry/env/production/default/WEB-INF/appengine-web.xml
index ea7cbadb6..3cd46adeb 100644
--- a/java/google/registry/env/production/default/WEB-INF/appengine-web.xml
+++ b/java/google/registry/env/production/default/WEB-INF/appengine-web.xml
@@ -9,7 +9,7 @@
   <sessions-enabled>true</sessions-enabled>
   <instance-class>B4_1G</instance-class>
   <basic-scaling>
-    <max-instances>50</max-instances>
+    <max-instances>100</max-instances>
     <idle-timeout>30m</idle-timeout>
   </basic-scaling>
 
diff --git a/java/google/registry/env/sandbox/backend/WEB-INF/appengine-web.xml b/java/google/registry/env/sandbox/backend/WEB-INF/appengine-web.xml
index da07bd489..69f1f6773 100644
--- a/java/google/registry/env/sandbox/backend/WEB-INF/appengine-web.xml
+++ b/java/google/registry/env/sandbox/backend/WEB-INF/appengine-web.xml
@@ -9,7 +9,7 @@
   <sessions-enabled>true</sessions-enabled>
   <instance-class>B4</instance-class>
   <basic-scaling>
-    <max-instances>50</max-instances>
+    <max-instances>100</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 8e64412bf..33629697b 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
@@ -9,7 +9,7 @@
   <sessions-enabled>true</sessions-enabled>
   <instance-class>B4</instance-class>
   <basic-scaling>
-    <max-instances>50</max-instances>
+    <max-instances>100</max-instances>
     <idle-timeout>30m</idle-timeout>
   </basic-scaling>