diff --git a/infrastructure/environments/demo-cfn-create-args.yaml b/infrastructure/environments/demo-cfn-create-args.yaml
index f7717def6..ff15ab6ae 100644
--- a/infrastructure/environments/demo-cfn-create-args.yaml
+++ b/infrastructure/environments/demo-cfn-create-args.yaml
@@ -3,7 +3,7 @@ Parameters:
   - ParameterKey: AdminUserEmail
     ParameterValue: my@email.com
   - ParameterKey: Version
-    ParameterValue: 3.9.0
+    ParameterValue: 3.9.1
   - ParameterKey: InfrastructureBucket
     ParameterValue: BUCKET_URL_PLACEHOLDER
   - ParameterKey: PublicEcrImageUri
diff --git a/infrastructure/environments/demo-cfn-update-args.yaml b/infrastructure/environments/demo-cfn-update-args.yaml
index 67392a047..61928e1bc 100644
--- a/infrastructure/environments/demo-cfn-update-args.yaml
+++ b/infrastructure/environments/demo-cfn-update-args.yaml
@@ -3,7 +3,7 @@ Parameters:
   - ParameterKey: AdminUserEmail
     UsePreviousValue: true
   - ParameterKey: Version
-    ParameterValue: 3.9.0
+    ParameterValue: 3.9.1
   - ParameterKey: InfrastructureBucket
     ParameterValue: BUCKET_URL_PLACEHOLDER
   - ParameterKey: PublicEcrImageUri