diff --git a/.github/workflows/linux-lcg.yml b/.github/workflows/linux-lcg.yml
index 73a8ccc9c1eb0807e1838f636211b74f6e899826..9b8abc28ddd963130bb1dad223e4d8527a4ed2ad 100644
--- a/.github/workflows/linux-lcg.yml
+++ b/.github/workflows/linux-lcg.yml
@@ -8,8 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        LCG: ["LCG_101/x86_64-ubuntu2004-gcc9-opt",
-              "LCG_99/x86_64-ubuntu2004-gcc9-opt"]
+        LCG: ["LCG_101/x86_64-ubuntu2004-gcc9-opt"]
     steps:
     - uses: actions/checkout@v2
     - uses: cvmfs-contrib/github-action-cvmfs@v2
@@ -27,8 +26,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        LCG: ["LCG_101/x86_64-ubuntu2004-gcc9-opt",
-              "LCG_99/x86_64-ubuntu2004-gcc9-opt"]
+        LCG: ["LCG_101/x86_64-ubuntu2004-gcc9-opt"]
     steps:
     - uses: actions/checkout@v2
     - uses: cvmfs-contrib/github-action-cvmfs@v2