diff --git a/packages/devtools-kit/package.json b/packages/devtools-kit/package.json
index c366cec4..b1a8b864 100644
--- a/packages/devtools-kit/package.json
+++ b/packages/devtools-kit/package.json
@@ -9,6 +9,7 @@
     "type": "git",
     "url": "git+https://github.com/vuejs/devtools.git"
   },
+  "sideEffects": false,
   "exports": {
     ".": {
       "import": "./dist/index.js",
diff --git a/packages/shared/package.json b/packages/shared/package.json
index f1d155bc..c099c276 100644
--- a/packages/shared/package.json
+++ b/packages/shared/package.json
@@ -9,6 +9,7 @@
     "type": "git",
     "url": "git+https://github.com/vuejs/devtools.git"
   },
+  "sideEffects": false,
   "exports": {
     ".": {
       "import": "./dist/index.js",