diff --git a/chat-client-ui-types/package.json b/chat-client-ui-types/package.json
index 3a1b1da4..8198ee5d 100644
--- a/chat-client-ui-types/package.json
+++ b/chat-client-ui-types/package.json
@@ -17,6 +17,7 @@
     },
     "author": "Amazon Web Services",
     "license": "Apache-2.0",
+    "sideEffects": false,
     "dependencies": {
         "@aws/language-server-runtimes-types": "^0.1.56"
     }
diff --git a/runtimes/package.json b/runtimes/package.json
index 5d2263c0..0a03d81b 100644
--- a/runtimes/package.json
+++ b/runtimes/package.json
@@ -9,6 +9,7 @@
     },
     "author": "Amazon Web Services",
     "license": "Apache-2.0",
+    "sideEffects": false,
     "engines": {
         "node": ">=18.0.0"
     },
diff --git a/types/package.json b/types/package.json
index 9d068ed9..b02c7bd7 100644
--- a/types/package.json
+++ b/types/package.json
@@ -17,6 +17,7 @@
     },
     "author": "Amazon Web Services",
     "license": "Apache-2.0",
+    "sideEffects": false,
     "dependencies": {
         "vscode-languageserver-textdocument": "^1.0.12",
         "vscode-languageserver-types": "^3.17.5"