diff --git a/.github/workflows/e2e-dashboard-tests.yml b/.github/workflows/e2e-dashboard-tests.yml
index 91948aa5..0f293273 100644
--- a/.github/workflows/e2e-dashboard-tests.yml
+++ b/.github/workflows/e2e-dashboard-tests.yml
@@ -25,6 +25,9 @@ jobs:
         with:
           node-version: '20'
 
+      - name: Setup tslib
+        run: make tslib
+
       - name: Build bundle.js
         working-directory: optuna_dashboard
         run: |
diff --git a/.github/workflows/typescript-tests.yml b/.github/workflows/typescript-tests.yml
index 075483cd..01c99470 100644
--- a/.github/workflows/typescript-tests.yml
+++ b/.github/workflows/typescript-tests.yml
@@ -75,14 +75,14 @@ jobs:
         with:
           node-version: '20'
       
-      - working-directory: optuna_dashboard
-        run: npm install
       - working-directory: tslib/types
         run: npm install
       - working-directory: tslib/storage
         run: npm install
       - working-directory: tslib/react
         run: npm install
+      - working-directory: optuna_dashboard
+        run: npm install
       - working-directory: standalone_app
         run: npm install
       - working-directory: vscode
@@ -101,6 +101,10 @@ jobs:
         uses: actions/setup-node@v2
         with:
           node-version: '20'
+
+      - name: Setup tslib
+        run: make tslib
+
       - name: Build bundle.js
         working-directory: optuna_dashboard
         run: |