diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 108e306..01cdaaa 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -14,6 +14,10 @@ jobs:
       fail-fast: false
       matrix:
         ruby: ['3.3', '3.2', '3.1', '3.0', '2.7']
+        use_system_libraries: [false, true]
+
+    env:
+      RUBY_GPGME_USE_SYSTEM_LIBRARIES: ${{ matrix.use_system_libraries && matrix.use_system_libraries == 'true' }}
 
     steps:
       - uses: actions/checkout@v3
@@ -21,6 +25,11 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
+      - name: Install libgpgme-dev
+        if: ${{ matrix.use_system_libraries }}
+        run: |
+          sudo apt install -y libgpgme-dev
+      - name: Set RUBY_GPGME_USE_SYSTEM_LIBRARIES
       - name: Install dependencies
         run: bundle install
       - name: Run tests