diff --git a/infra/config/generated/cr-buildbucket.cfg b/infra/config/generated/cr-buildbucket.cfg
index 51c0ff6..5862c76 100644
--- a/infra/config/generated/cr-buildbucket.cfg
+++ b/infra/config/generated/cr-buildbucket.cfg
@@ -32,7 +32,7 @@
       name: "mac"
       swarming_host: "chromium-swarm.appspot.com"
       dimensions: "cpu:x86-64"
-      dimensions: "os:Mac-10.15"
+      dimensions: "os:Mac-11"
       dimensions: "pool:luci.flex.ci"
       recipe {
         name: "gn"
@@ -122,7 +122,7 @@
       name: "mac"
       swarming_host: "chromium-swarm.appspot.com"
       dimensions: "cpu:x86-64"
-      dimensions: "os:Mac-10.15"
+      dimensions: "os:Mac-11"
       dimensions: "pool:luci.flex.try"
       recipe {
         name: "gn"
diff --git a/infra/config/main.star b/infra/config/main.star
index 0fb49df..8b269ef 100755
--- a/infra/config/main.star
+++ b/infra/config/main.star
@@ -120,7 +120,7 @@
     )
 
 ci_builder("linux", "Ubuntu-22.04")
-ci_builder("mac", "Mac-10.15", caches = [swarming.cache("macos_sdk")])
+ci_builder("mac", "Mac-11", caches = [swarming.cache("macos_sdk")])
 ci_builder("win", "Windows-10", caches = [swarming.cache("windows_sdk")])
 
 luci.cq(
@@ -197,5 +197,5 @@
     )
 
 try_builder("linux", "Ubuntu-22.04")
-try_builder("mac", "Mac-10.15", caches = [swarming.cache("macos_sdk")])
+try_builder("mac", "Mac-11", caches = [swarming.cache("macos_sdk")])
 try_builder("win", "Windows-10", caches = [swarming.cache("windows_sdk")])
diff --git a/infra/recipe_modules/macos_sdk/__init__.py b/infra/recipe_modules/macos_sdk/__init__.py
index 56b6a94..52364a7 100644
--- a/infra/recipe_modules/macos_sdk/__init__.py
+++ b/infra/recipe_modules/macos_sdk/__init__.py
@@ -33,12 +33,14 @@
                 tool_ver=Single(str),
             ),
             default={
+                # Check macOS version used in CQ/CI and required version of Xcode.
+                # https://xcodereleases.com/
                 'sdk_version':
-                    '12B5025f',
+                    '15C500b',  # Xcode 15.2
                 'tool_package':
                     'infra/tools/mac_toolchain/${platform}',
                 'tool_version':
-                    'git_revision:e9b1fe29fe21a1cd36428c43ea2aba244bd31280',
+                    'git_revision:1b9e28e1cfc65541b83def4480835449b60188a1',
             },
         )
 }
diff --git a/infra/recipe_modules/macos_sdk/examples/full.expected/mac.json b/infra/recipe_modules/macos_sdk/examples/full.expected/mac.json
index 58b1191..63d3ec7 100644
--- a/infra/recipe_modules/macos_sdk/examples/full.expected/mac.json
+++ b/infra/recipe_modules/macos_sdk/examples/full.expected/mac.json
@@ -6,7 +6,7 @@
       "-root",
       "[CACHE]/macos_sdk",
       "-ensure-file",
-      "infra/tools/mac_toolchain/${platform} git_revision:e9b1fe29fe21a1cd36428c43ea2aba244bd31280",
+      "infra/tools/mac_toolchain/${platform} git_revision:1b9e28e1cfc65541b83def4480835449b60188a1",
       "-max-threads",
       "0",
       "-json-output",
@@ -19,7 +19,7 @@
       "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
       "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
       "@@@STEP_LOG_LINE@json.output@      {@@@",
-      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-git_revision:e9b\",@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-git_revision:1b9\",@@@",
       "@@@STEP_LOG_LINE@json.output@        \"package\": \"infra/tools/mac_toolchain/resolved-platform\"@@@",
       "@@@STEP_LOG_LINE@json.output@      }@@@",
       "@@@STEP_LOG_LINE@json.output@    ]@@@",
@@ -35,7 +35,7 @@
       "-kind",
       "mac",
       "-xcode-version",
-      "12b5025f",
+      "15c500b",
       "-output-dir",
       "[CACHE]/macos_sdk/XCode.app"
     ],
diff --git a/infra/recipes/gn.expected/ci_mac.json b/infra/recipes/gn.expected/ci_mac.json
index e8d64e2..93c3f9c 100644
--- a/infra/recipes/gn.expected/ci_mac.json
+++ b/infra/recipes/gn.expected/ci_mac.json
@@ -156,7 +156,7 @@
       "-root",
       "[CACHE]/macos_sdk",
       "-ensure-file",
-      "infra/tools/mac_toolchain/${platform} git_revision:e9b1fe29fe21a1cd36428c43ea2aba244bd31280",
+      "infra/tools/mac_toolchain/${platform} git_revision:1b9e28e1cfc65541b83def4480835449b60188a1",
       "-max-threads",
       "0",
       "-json-output",
@@ -181,7 +181,7 @@
       "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
       "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
       "@@@STEP_LOG_LINE@json.output@      {@@@",
-      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-git_revision:e9b\",@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-git_revision:1b9\",@@@",
       "@@@STEP_LOG_LINE@json.output@        \"package\": \"infra/tools/mac_toolchain/resolved-platform\"@@@",
       "@@@STEP_LOG_LINE@json.output@      }@@@",
       "@@@STEP_LOG_LINE@json.output@    ]@@@",
@@ -197,7 +197,7 @@
       "-kind",
       "mac",
       "-xcode-version",
-      "12b5025f",
+      "15c500b",
       "-output-dir",
       "[CACHE]/macos_sdk/XCode.app"
     ],
diff --git a/infra/recipes/gn.expected/cq_mac.json b/infra/recipes/gn.expected/cq_mac.json
index 6263b81..a5ec5dc 100644
--- a/infra/recipes/gn.expected/cq_mac.json
+++ b/infra/recipes/gn.expected/cq_mac.json
@@ -207,7 +207,7 @@
       "-root",
       "[CACHE]/macos_sdk",
       "-ensure-file",
-      "infra/tools/mac_toolchain/${platform} git_revision:e9b1fe29fe21a1cd36428c43ea2aba244bd31280",
+      "infra/tools/mac_toolchain/${platform} git_revision:1b9e28e1cfc65541b83def4480835449b60188a1",
       "-max-threads",
       "0",
       "-json-output",
@@ -232,7 +232,7 @@
       "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
       "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
       "@@@STEP_LOG_LINE@json.output@      {@@@",
-      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-git_revision:e9b\",@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-git_revision:1b9\",@@@",
       "@@@STEP_LOG_LINE@json.output@        \"package\": \"infra/tools/mac_toolchain/resolved-platform\"@@@",
       "@@@STEP_LOG_LINE@json.output@      }@@@",
       "@@@STEP_LOG_LINE@json.output@    ]@@@",
@@ -248,7 +248,7 @@
       "-kind",
       "mac",
       "-xcode-version",
-      "12b5025f",
+      "15c500b",
       "-output-dir",
       "[CACHE]/macos_sdk/XCode.app"
     ],