diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 7483e7434..838a3f56a 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-20.04]
         gcc_v: [7,8,9,10] # Version of GFortran we want to use.
         python-version: [3.9]
     env:
@@ -23,18 +23,18 @@ jobs:
       run: echo ::set-output name=tag::${GITHUB_REF#refs/*/}
 
     - name: Checkout code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         submodules: recursive
 
     - name: Setup cmake
       if: contains( matrix.gcc_v, 9 )
-      uses: jwlawson/actions-setup-cmake@v1.8
+      uses: jwlawson/actions-setup-cmake@v1.13
       with:
         cmake-version: '3.19.x'
 
     - name: Install Python
-      uses: actions/setup-python@v1 # Use pip to install latest CMake, & FORD/Jin2For, etc.
+      uses: actions/setup-python@v4 # Use pip to install latest CMake, & FORD/Jin2For, etc.
       with:
         python-version: ${{ matrix.python-version }}
 
@@ -112,7 +112,7 @@ jobs:
 
     - name: Deploy documentation for tagged release
       if: matrix.gcc_v == 7 && startsWith(github.ref, 'refs/tags/')
-      uses: JamesIves/github-pages-deploy-action@4.1.3
+      uses: JamesIves/github-pages-deploy-action@v4.4.1
       with:
         branch: gh-pages # The branch the action should deploy to.
         folder: doc  # The folder the action should deploy.