diff --git a/.github/workflows/client.yml b/.github/workflows/client.yml
index 6eb06f364..02c2a4a43 100644
--- a/.github/workflows/client.yml
+++ b/.github/workflows/client.yml
@@ -43,7 +43,7 @@ jobs:
           cmake_target: launchdarkly-cpp-client
           simulate_release: true
   build-test-client-mac:
-    runs-on: macos-12
+    runs-on: macos-13
     steps:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/ci
diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index 7f1be3f88..d4adf59d7 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -23,7 +23,7 @@ jobs:
           platform_version: '22.04'
 
   test-macos:
-    runs-on: macos-12
+    runs-on: macos-13
     steps:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/cmake-test
diff --git a/.github/workflows/hello-apps.yml b/.github/workflows/hello-apps.yml
index 30b7de123..4b76149aa 100644
--- a/.github/workflows/hello-apps.yml
+++ b/.github/workflows/hello-apps.yml
@@ -15,7 +15,7 @@ jobs:
   smoketest:
     strategy:
       matrix:
-        os: [ "ubuntu-22.04", "macos-12", "windows-2022" ]
+        os: [ "ubuntu-22.04", "macos-13", "windows-2022" ]
       fail-fast: false
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/.github/workflows/manual-sdk-release-artifacts.yml b/.github/workflows/manual-sdk-release-artifacts.yml
index deb5dda18..655754875 100644
--- a/.github/workflows/manual-sdk-release-artifacts.yml
+++ b/.github/workflows/manual-sdk-release-artifacts.yml
@@ -38,7 +38,7 @@ jobs:
     strategy:
       matrix:
         # Each of the platforms for which release-artifacts need generated.
-        os: [ ubuntu-latest, windows-2022, macos-12 ]
+        os: [ ubuntu-latest, windows-2022, macos-13 ]
     runs-on: ${{ matrix.os }}
     outputs:
       hashes-linux: ${{ steps.release-sdk.outputs.hashes-linux }}
diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index 0abae4ec2..e6718c154 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -24,7 +24,7 @@ jobs:
     strategy:
       matrix:
         # Each of the platforms for which release-artifacts need generated.
-        os: [ ubuntu-latest, windows-2022, macos-12 ]
+        os: [ ubuntu-latest, windows-2022, macos-13 ]
     runs-on: ${{ matrix.os }}
     needs: [ 'release-please' ]
     if: ${{ needs.release-please.outputs.package-client-released == 'true'}}
@@ -48,7 +48,7 @@ jobs:
     strategy:
       matrix:
         # Each of the platforms for which release-artifacts need generated.
-        os: [ ubuntu-latest, windows-2022, macos-12 ]
+        os: [ ubuntu-latest, windows-2022, macos-13 ]
     runs-on: ${{ matrix.os }}
     needs: [ 'release-please' ]
     if: ${{ needs.release-please.outputs.package-server-released == 'true'}}
@@ -72,7 +72,7 @@ jobs:
     strategy:
       matrix:
         # Each of the platforms for which release-artifacts need generated.
-        os: [ ubuntu-latest, windows-2022, macos-12 ]
+        os: [ ubuntu-latest, windows-2022, macos-13 ]
     runs-on: ${{ matrix.os }}
     needs: [ 'release-please' ]
     if: ${{ needs.release-please.outputs.package-server-redis-released  == 'true'}}
diff --git a/.github/workflows/server-redis.yml b/.github/workflows/server-redis.yml
index d0e1a2318..235065d87 100644
--- a/.github/workflows/server-redis.yml
+++ b/.github/workflows/server-redis.yml
@@ -28,7 +28,7 @@ jobs:
           cmake_target: launchdarkly-cpp-server-redis-source
           simulate_release: true
   build-redis-mac:
-    runs-on: macos-12
+    runs-on: macos-13
     steps:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/ci
diff --git a/.github/workflows/server.yml b/.github/workflows/server.yml
index 642211efa..408859829 100644
--- a/.github/workflows/server.yml
+++ b/.github/workflows/server.yml
@@ -43,7 +43,7 @@ jobs:
           cmake_target: launchdarkly-cpp-server
           simulate_release: true
   build-test-server-mac:
-    runs-on: macos-12
+    runs-on: macos-13
     steps:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/ci