diff --git a/.github/workflows/linting.yml b/.github/workflows/linting.yml
index 5f5ed47af29..9d5354858a1 100644
--- a/.github/workflows/linting.yml
+++ b/.github/workflows/linting.yml
@@ -7,7 +7,7 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: set up Python
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v2
       with:
         python-version: 3.8
 
diff --git a/.github/workflows/unit_tests.yml b/.github/workflows/unit_tests.yml
index f7d473b738a..cb5cfe87612 100644
--- a/.github/workflows/unit_tests.yml
+++ b/.github/workflows/unit_tests.yml
@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-18.04
     strategy:
       matrix:
-        python: [2.7, 3.6, 3.7, 3.8, 3.9, '3.10']
+        python: [2.7, 3.5, 3.6, 3.7, 3.8, 3.9, '3.10']
         modules_tool: [Lmod-6.6.3, Lmod-7.8.22, Lmod-8.1.14]
         module_syntax: [Lua, Tcl]
         # exclude some configurations: only test Tcl module syntax with Lmod 7.x and Python 2.7 & 3.6
@@ -14,6 +14,8 @@ jobs:
             module_syntax: Tcl
           - modules_tool: Lmod-8.1.14
             module_syntax: Tcl
+          - python: 3.5
+            module_syntax: Tcl
           - python: 3.7
             module_syntax: Tcl
           - python: 3.8
@@ -36,7 +38,7 @@ jobs:
         key: eb-sourcepath
 
     - name: set up Python
-      uses: actions/setup-python@v1
+      uses: actions/setup-python@v2
       with:
         python-version: ${{matrix.python}}
         architecture: x64