diff --git a/.github/workflows/build-ectrans4py.yml b/.github/workflows/build-ectrans4py.yml
index c20950f5f..18e4458e6 100644
--- a/.github/workflows/build-ectrans4py.yml
+++ b/.github/workflows/build-ectrans4py.yml
@@ -47,8 +47,8 @@ jobs:
 
           - name: macos
             # Xcode compiler requires empty environment variables, so we pass null (~) here
-            os: macos-13
-            compiler: clang-14
+            os: macos-15
+            compiler: clang-17
             compiler_cc: ~
             compiler_cxx: ~
             compiler_fc: gfortran-13
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2bbb436e6..d772aa3d9 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -77,8 +77,8 @@ jobs:
 
           - name: macos
             # Xcode compiler requires empty environment variables, so we pass null (~) here
-            os: macos-13
-            compiler: clang-14
+            os: macos-15
+            compiler: clang-17
             compiler_cc: ~
             compiler_cxx: ~
             compiler_fc: gfortran-13