diff --git a/.github/workflows/tests-cxx.yml b/.github/workflows/tests-cxx.yml
index ab6c40e..951859b 100644
--- a/.github/workflows/tests-cxx.yml
+++ b/.github/workflows/tests-cxx.yml
@@ -9,6 +9,7 @@ jobs:
     - uses: actions/checkout@v4
     - name: Install libraries
       run: |
+        sudo apt-get update
         sudo apt-get install libhdf5-serial-dev libboost-dev
     - name: make test
       run: make test