diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d9b8aa35..bbcdfe94 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,6 +19,6 @@ jobs:
         uses: actions/setup-node@v1
         with:
           node-version: 16
-      - run: yarn install --frozen-lockfile
+      - run: npm ci
       - run: script/build
-      - run: yarn prettier --check src
+      - run: npm exec prettier --check src
diff --git a/.github/workflows/npmpublish.yml b/.github/workflows/npmpublish.yml
index a93b8664..b6acac41 100644
--- a/.github/workflows/npmpublish.yml
+++ b/.github/workflows/npmpublish.yml
@@ -16,7 +16,7 @@ jobs:
         with:
           node-version: 14
           registry-url: https://registry.npmjs.org/
-      - run: yarn install --frozen-lockfile
+      - run: npm ci
       - run: npm publish
         env:
           NODE_AUTH_TOKEN: ${{secrets.NPM_TOKEN}}