diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index 49bac4d..c694e67 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -17,7 +17,7 @@ jobs:
         node-version: 12
 
     - name: Build
-      run: npm run build:ci
+      run: npm run postinstall && npm run build:ci
 
     - name: Deploy
       uses: peaceiris/actions-gh-pages@v2.4.0
diff --git a/package.json b/package.json
index 3560f7a..0061be7 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
     "build:ci": "parcel build src/index.html --public-url . --log-level 2",
     "test": "jest",
     "test:coverage": "npm run test -- --coverage",
-    "postinstall": "rm -rf ./.cache && node ./postinstall.js"
+    "postinstall": "rm -rf .cache && node postinstall.js"
   },
   "dependencies": {},
   "devDependencies": {