diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bdf02c2a..43a712c2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,9 @@ jobs:
         with:
           ref: ${{ github.event.inputs.ref }}
       - name: Install Dependencies
-        run: sudo apt-get install -y python3-sphinx
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y python3-sphinx
       - name: Build Documentation
         run: |
           mkdir -p build