diff --git a/.circleci/config.yml b/.circleci/config.yml
index de7e22aa..bb2a2df1 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,8 +7,8 @@ defaults: &defaults
 step_restore_cache: &restore_cache
   restore_cache:
     keys:
-    - v1-dependencies-{{ checksum "yarn.lock" }}-1
-    - v1-dependencies-
+      - v1-dependencies-{{ checksum "yarn.lock" }}-1
+      - v1-dependencies-
 
 step_install_deps: &install_deps
   run:
@@ -45,19 +45,9 @@ jobs:
       - *save_cache
       - run: yarn test-dts
 
-  check-size:
-    <<: *defaults
-    steps:
-      - checkout
-      - *restore_cache
-      - *install_deps
-      - *save_cache
-      - run: yarn size
-
 workflows:
   version: 2
   ci:
     jobs:
       - test
       - test-dts
-      - check-size
diff --git a/.github/workflows/size-check.yml b/.github/workflows/size-check.yml
new file mode 100644
index 00000000..bf63447e
--- /dev/null
+++ b/.github/workflows/size-check.yml
@@ -0,0 +1,19 @@
+name: 'size'
+on:
+  pull_request:
+    branches:
+      - master
+jobs:
+  size:
+    runs-on: ubuntu-latest
+    env:
+      CI_JOB_NUMBER: 1
+    steps:
+      - uses: actions/checkout@v1
+      - uses: bahmutov/npm-install@v1
+
+      - uses: posva/size-check-action@v1.0.2
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          build_script: size
+          files: packages/vue/dist/vue.global.prod.js packages/runtime-dom/dist/runtime-dom.global.prod.js packages/size-check/dist/size-check.global.prod.js