diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 144fd99..85ab652 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,10 +24,14 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-latest
+          - os: ubuntu-22.04
             compiler: gfortran-10
             cmake_generator: Unix Makefiles
             shell: bash
+          - os: ubuntu-latest
+            compiler: gfortran-13
+            cmake_generator: Unix Makefiles
+            shell: bash
           - os: macos-latest
             compiler: gfortran-12
             cmake_generator: Unix Makefiles