diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index ba8ab27b..2cc27b01 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -35,9 +35,11 @@ jobs:
       - uses: actions/setup-node@v1
         with:
           node-version: "12.x"
-      - run: yarn install
-      - run: yarn render:bibata-modern
-      - run: yarn render:bibata-original
+      - run: |
+          rm -rf bitmaps
+          yarn install
+          yarn render:bibata-modern
+          yarn render:bibata-original
 
       - name: Set up Python
         uses: actions/setup-python@v2