diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6418413..0e8e4bc 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -15,13 +15,13 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-22.04, macos-11, macos-12]
+        os: [ubuntu-22.04, macos-12, macos-13]
         compiler: [gfortran-10, gfortran-11, gfortran-12, gfortran-13]
         exclude:
-          - os: macos-11
-            compiler: gfortran-13
           - os: macos-12
             compiler: gfortran-10
+          - os: macos-13
+            compiler: gfortran-10
 
       # fail-fast if set to 'true' here is good for production, but when
       # debugging, set to 'false'. fail-fast means if *any* ci test in the matrix fails