diff --git a/.github/workflows/test-docs.yml b/.github/workflows/test-docs.yml
index 6323d8be..d9ca31c4 100644
--- a/.github/workflows/test-docs.yml
+++ b/.github/workflows/test-docs.yml
@@ -41,6 +41,7 @@ jobs:
           sudo apt install libgdal-dev
           python -m pip install --upgrade pip
           make develop
+          npm install mocha
       - name: run tests
         run: make test
         env: