diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index f9431db..2ac4710 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -16,17 +16,39 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
-      with:
-        python-version: ${{ matrix.python-version }}
-    - name: Install dependencies
-      run: |
-        python -m pip install --upgrade pip
-        python -m pip install tox tox-gh-actions
-    - name: Test with tox
-      run: tox
+      - uses: actions/checkout@v2
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install tox tox-gh-actions
+
+      # Install TeX distribution for PGF output from matplotlib
+      - name: Install TeX distribution for PGF output (Ubuntu)
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y texlive-latex-extra
+
+      - name: Install TeX distribution for PGF output (Windows)
+        if: runner.os == 'Windows'
+        run: |
+          choco install miktex -y
+          echo "C:\Program Files\MiKTeX\miktex\bin\x64" >> $env:GITHUB_PATH
+
+      - name: Install TeX distribution for PGF output (macOS)
+        if: runner.os == 'macOS'
+        run: |
+          brew install --cask mactex-no-gui
+          echo "/Library/TeX/texbin" >> $GITHUB_PATH
+
+      - name: Test with tox
+        run: tox
 
   deploy:
     needs: build