diff --git a/tests/playgrounds/advanced_playground.html b/tests/playgrounds/advanced_playground.html
index b4b6c3de5..dfc8d3e1e 100644
--- a/tests/playgrounds/advanced_playground.html
+++ b/tests/playgrounds/advanced_playground.html
@@ -67,7 +67,7 @@
 <script src="../themes/test_themes.js"></script>
 <script src="./screenshot.js"></script>
 <script src="./test_blocks_toolbox.js"></script>
-<script src="https://unpkg.com/@blockly/dev-tools/dist/index.js"></script>
+<script src="https://unpkg.com/@blockly/dev-tools@1.1.1/dist/index.js"></script>
 <script src="https://unpkg.com/@blockly/theme-modern/dist/index.js"></script>
 
 <script>