diff --git a/.ci.yaml b/.ci.yaml
index 9586ff77c0..5f6a93ea9c 100755
--- a/.ci.yaml
+++ b/.ci.yaml
@@ -63,10 +63,10 @@ platform_properties:
         ]
       dependencies: >-
         []
-      os: Mac-12
+      os: Mac-10.15
       device_type: none
       mac_model: Macmini8,1
-      xcode: 13a233
+      xcode: 12c33
   mac_android:
     properties:
       caches: >-
@@ -85,7 +85,7 @@ platform_properties:
           {"dependency": "chrome_and_driver", "version": "version:84"},
           {"dependency": "open_jdk"}
         ]
-      os: Mac-12
+      os: Mac-12.0
       device_os: N
   mac_ios:
     properties:
@@ -106,7 +106,7 @@ platform_properties:
           {"dependency": "gems"},
           {"dependency": "ios_signing"}
         ]
-      os: Mac-12
+      os: Mac-12.0
       device_os: iOS-15.1
       xcode: 13a233
   windows: