diff --git a/.github/actions/setup-venv/action.yml b/.github/actions/setup-venv/action.yml
index c42420a..a58ed56 100644
--- a/.github/actions/setup-venv/action.yml
+++ b/.github/actions/setup-venv/action.yml
@@ -16,6 +16,11 @@ runs:
       with:
         python-version: ${{ inputs.python-version }}
 
+    - shell: bash
+      run: |
+        # install ffmpeg
+        apt install ffmpeg
+
     - shell: bash
       run: |
         # Install prerequisites.
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 87521a4..971cfe7 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -30,8 +30,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # python: ['3.7', '3.10']
-        python: ['3.10']
+        python: ['3.7', '3.10']
         task: # --show-capture=no on purpose
           - name: Test
             run: |