diff --git a/.github/workflows/build-macos.yml b/.github/workflows/build-macos.yml
index 854fa097..46570708 100644
--- a/.github/workflows/build-macos.yml
+++ b/.github/workflows/build-macos.yml
@@ -32,6 +32,9 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     
+    - name: Install gfortran
+      run: sudo apt install gfortran
+    
     - name: Clean up FortranCInterface_VERIFY
       # FortranCInterface_VERIFY fails on macOS, but it's not actually needed for the current build
       run: sed -i".backup" 's/FortranCInterface_VERIFY(CXX)/# FortranCInterface_VERIFY(CXX)/g' ${{github.workspace}}/CMakeLists.txt
diff --git a/.github/workflows/build-windows.yml b/.github/workflows/build-windows.yml
index f1e261b6..ecfa1b71 100644
--- a/.github/workflows/build-windows.yml
+++ b/.github/workflows/build-windows.yml
@@ -32,6 +32,9 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     
+    - name: Install gfortran
+      run: sudo apt install gfortran
+    
     - name: Clean up FortranCInterface_VERIFY
       # FortranCInterface_VERIFY fails on macOS, but it's not actually needed for the current build
       run: sed -i 's/FortranCInterface_VERIFY(CXX)/# FortranCInterface_VERIFY(CXX)/g' ${{github.workspace}}/CMakeLists.txt