diff --git a/.evergreen.yml b/.evergreen.yml
index 2595605b6..cf3ee06ea 100644
--- a/.evergreen.yml
+++ b/.evergreen.yml
@@ -17210,7 +17210,7 @@ tasks:
 buildvariants:
   - name: darwin_unit
     display_name: "MacOS Big Sur (Unit tests)"
-    run_on: macos-11
+    run_on: macos-14-arm64
     expansions:
       executable_os_id: darwin-x64
     tasks:
diff --git a/.evergreen/evergreen.yml.in b/.evergreen/evergreen.yml.in
index 4b4d1d58b..61601b7b7 100644
--- a/.evergreen/evergreen.yml.in
+++ b/.evergreen/evergreen.yml.in
@@ -1500,7 +1500,7 @@ tasks:
 buildvariants:
   - name: darwin_unit
     display_name: "MacOS Big Sur (Unit tests)"
-    run_on: macos-11
+    run_on: macos-14-arm64
     expansions:
       executable_os_id: darwin-x64
     tasks: