diff --git a/lib/terraform-substrate/terraform-substrate.template.yaml b/lib/terraform-substrate/terraform-substrate.template.yaml
index 3c5f8ce..d3c4244 100644
--- a/lib/terraform-substrate/terraform-substrate.template.yaml
+++ b/lib/terraform-substrate/terraform-substrate.template.yaml
@@ -3605,6 +3605,16 @@ Resources:
                   - s3:PutBucketPolicy
                   - s3:PutBucketPublicAccessBlock
                 Resource: arn:aws:s3:::elasticbeanstalk-us-east-1-396287094661
+              # Elastic Beanstalk stages the CloudFormation template for
+              # configuration UpdateStack calls in its AWS-owned regional
+              # bucket and CloudFormation fetches it with the caller's
+              # credentials. Zip deploys never touch this path.
+              - Sid: ReadBeanstalkServiceTemplates
+                Effect: Allow
+                Action:
+                  - s3:GetObject
+                  - s3:GetObjectVersion
+                Resource: arn:aws:s3:::elasticbeanstalk-us-east-1/*
               - Sid: ManageCloudFormationTemplates
                 Effect: Allow
                 Action: