diff --git a/pkg/codegen/schema/pulumi.json b/pkg/codegen/schema/pulumi.json
index 4c6a6b270054..08e99123a2ab 100644
--- a/pkg/codegen/schema/pulumi.json
+++ b/pkg/codegen/schema/pulumi.json
@@ -68,6 +68,7 @@
                     "format": "regex"
                 }
             },
+            "additionalProperties": false,
             "required": ["moduleFormat"]
         },
         "config": {
@@ -314,6 +315,7 @@
                             "type": "object"
                         }
                     },
+                    "additionalProperties": false,
                     "required": ["environment"]
                 },
                 "deprecationMessage": {