diff --git a/.gitea/workflows/validate.yml b/.gitea/workflows/validate.yml
index 21f9822..b9f575f 100644
--- a/.gitea/workflows/validate.yml
+++ b/.gitea/workflows/validate.yml
@@ -36,6 +36,13 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      # The opencv-python wheel links against libGL at import time, so cv2
+      # cannot even be imported on the bare runner image.
+      - name: Install the OpenCV shared libraries
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y --no-install-recommends libgl1 libglib2.0-0
+
       - uses: astral-sh/setup-uv@v5
         with:
           enable-cache: true