diff --git a/.github/workflows/macos-10.15.yaml b/.github/workflows/macos-10.15.yaml
index 80ce0df..299dfc9 100644
--- a/.github/workflows/macos-10.15.yaml
+++ b/.github/workflows/macos-10.15.yaml
@@ -12,7 +12,7 @@ on:
 jobs:
   build:
 
-    runs-on: macos-11
+    runs-on: macos-10.15
 
     env:
       CSC_IDENTITY_AUTO_DISCOVERY: false
diff --git a/.github/workflows/macos-11.yaml b/.github/workflows/macos-11.yaml
index c3d6563..1e864e5 100644
--- a/.github/workflows/macos-11.yaml
+++ b/.github/workflows/macos-11.yaml
@@ -12,7 +12,7 @@ on:
 jobs:
   build:
 
-    runs-on: macos-10.15
+    runs-on: macos-11
 
     env:
       CSC_IDENTITY_AUTO_DISCOVERY: false