diff --git a/.gitlab/os-macos.yml b/.gitlab/os-macos.yml
index 6e99249fc9..66ee5931c2 100644
--- a/.gitlab/os-macos.yml
+++ b/.gitlab/os-macos.yml
@@ -7,7 +7,7 @@
         GIT_CLONE_PATH: "$CI_BUILDS_DIR/cmake ci ext/$CI_CONCURRENT_ID"
         # TODO: Factor this out so that each job selects the Xcode version to
         # use so that different versions can be tested in a single pipeline.
-        DEVELOPER_DIR: "/Applications/Xcode-16.3.app/Contents/Developer"
+        DEVELOPER_DIR: "/Applications/Xcode-16.4.app/Contents/Developer"
         # Avoid conflicting with other projects running on the same machine.
         SCCACHE_SERVER_PORT: 4227
 
@@ -144,7 +144,7 @@
         - cmake # Since this is a bare runner, pin to a project.
         - macos-x86_64
         - shell
-        - xcode-16.3
+        - xcode-16.4
         - nonconcurrent
 
 .macos_x86_64_tags_ext:
@@ -152,7 +152,7 @@
         - cmake # Since this is a bare runner, pin to a project.
         - macos-x86_64
         - shell
-        - xcode-16.3
+        - xcode-16.4
         - concurrent
 
 .macos_arm64_tags:
@@ -160,7 +160,7 @@
         - cmake # Since this is a bare runner, pin to a project.
         - macos-arm64
         - shell
-        - xcode-16.3
+        - xcode-16.4
         - nonconcurrent
 
 .macos_arm64_tags_ext:
@@ -168,7 +168,7 @@
         - cmake # Since this is a bare runner, pin to a project.
         - macos-arm64
         - shell
-        - xcode-16.3
+        - xcode-16.4
         - concurrent
 
 .macos_arm64_tags_package:
@@ -176,7 +176,7 @@
         - cmake # Since this is a bare runner, pin to a project.
         - macos-arm64
         - shell
-        - xcode-16.3
+        - xcode-16.4
         - nonconcurrent
         - finder