diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7cb267c2dd..eaeaadf055 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -281,10 +281,10 @@ jobs:
   # otherwise has no server-test coverage. Scoped to the observer/watcher suites to
   # bound runtime.
   server-tests-macos:
-    name: server-tests (macos-14, file observation)
+    name: server-tests (macos-15, file observation)
     needs: changes
     if: ${{ !cancelled() && (needs.changes.outputs.full != 'false' || needs.changes.outputs.server != 'false') }}
-    runs-on: macos-14
+    runs-on: macos-15
     steps:
       - uses: actions/checkout@v4
 
diff --git a/scripts/ci-workflow.test.mjs b/scripts/ci-workflow.test.mjs
index 37508cad7d..1052f87b26 100644
--- a/scripts/ci-workflow.test.mjs
+++ b/scripts/ci-workflow.test.mjs
@@ -24,7 +24,7 @@ const gatedCiJobs = new Map([
     "server-integration-windows",
     { name: "server-integration (windows-latest)", contract: "server" },
   ],
-  ["server-tests-macos", { name: "server-tests (macos-14, file observation)", contract: "server" }],
+  ["server-tests-macos", { name: "server-tests (macos-15, file observation)", contract: "server" }],
   ["desktop-tests-ubuntu", { name: "desktop-tests (ubuntu-latest)", contract: "desktop" }],
   ["desktop-tests-windows", { name: "desktop-tests (windows-latest)", contract: "desktop" }],
   ["app-tests", { name: "app-tests", contract: "app" }],