diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 36a785c..9af02bb 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -38,7 +38,7 @@ jobs:
 
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
+          python -m pip install --upgrade pip cmake
           if [[ "${{ matrix.otio-version }}" == "main" ]]; then
             pip install "git+https://github.com/AcademySoftwareFoundation/OpenTimelineIO.git"
           else