diff --git a/.github/workflows/unit_tests.yml b/.github/workflows/unit_tests.yml
index 12fe8cb5b63..94963f832b7 100644
--- a/.github/workflows/unit_tests.yml
+++ b/.github/workflows/unit_tests.yml
@@ -14,12 +14,8 @@ jobs:
     strategy:
       matrix:
         python: [3.6, '3.11']
-        modules_tool: [Lmod-7.8.22, Lmod-8.6.8]
+        modules_tool: [Lmod-8.6.8]
         module_syntax: [Lua, Tcl]
-        # exclude some configurations: only test Tcl module syntax with Lmod 8.x and Python 3.6
-        exclude:
-          - modules_tool: Lmod-7.8.22
-            module_syntax: Tcl
       fail-fast: false
     steps:
     - uses: actions/checkout@v2
@@ -62,7 +58,7 @@ jobs:
           # first determine which branch of easybuild-framework repo to install
           BRANCH=develop
           if [ "x$GITHUB_BASE_REF" = 'xmain' ]; then BRANCH=main; fi
-          if [ "x$GITHUB_BASE_REF" = 'x4.x' ]; then BRANCH=4.x; fi
+          if [ "x$GITHUB_BASE_REF" = 'x5.0.x' ]; then BRANCH=5.0.x; fi
           echo "Using easybuild-framework branch $BRANCH (\$GITHUB_BASE_REF $GITHUB_BASE_REF)"
 
           git clone -b $BRANCH --depth 10 --single-branch https://github.com/easybuilders/easybuild-framework.git