diff --git a/.github/workflows/cmake_ctest.yml b/.github/workflows/cmake_ctest.yml
index 6aac91b6..aec03e06 100644
--- a/.github/workflows/cmake_ctest.yml
+++ b/.github/workflows/cmake_ctest.yml
@@ -56,7 +56,7 @@ jobs:
         # see: https://github.com/actions/runner-images/issues/8659
         sudo rm -f /etc/apt/sources.list.d/ubuntu-toolchain-r-ubuntu-test-jammy.list
         sudo apt-get update
-        sudo apt-get install -y --allow-downgrades libc6=2.35-0ubuntu3.6 libc6-dev=2.35-0ubuntu3.6 libstdc++6=12.3.0-1ubuntu1~22.04 libgcc-s1=12.3.0-1ubuntu1~22.04
+        sudo apt-get install -y --allow-downgrades libc6=2.39-0ubuntu8​  libc6-dev=2.39-0ubuntu8​  libstdc++6=12.3.0-1ubuntu1~22.04 libgcc-s1=12.3.0-1ubuntu1~22.04
         sudo /usr/bin/Xvfb $DISPLAY &
 
     # This lets us use sscache on Windows