diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index 51a86484..221dc524 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -46,7 +46,7 @@ jobs:
   CMake_Linux:
     strategy:
       matrix:
-        tag: ['5.6', '5.7', '5.8', '5.9', '5.10']
+        tag: ['5.7', '5.8', '5.9', '5.10']
     runs-on: ubuntu-latest
     container:
       image: swift:${{ matrix.tag }}