diff --git a/.github/workflows/_build.yml b/.github/workflows/_build.yml
index 2ed31b7..d43c5c7 100644
--- a/.github/workflows/_build.yml
+++ b/.github/workflows/_build.yml
@@ -12,12 +12,12 @@ on:
         description: GitHub Actions runner OS
         type: string
         required: false
-        default: "macos-11"
+        default: "macos-12"
       build_os:
         description: Target OS to build for
         type: string
         required: false
-        default: "macos-11"
+        default: "macos-12"
       git_ref:
         description: Git ref to build
         type: string
diff --git a/.github/workflows/_prepare.yml b/.github/workflows/_prepare.yml
index 150d084..3a78885 100644
--- a/.github/workflows/_prepare.yml
+++ b/.github/workflows/_prepare.yml
@@ -7,7 +7,7 @@ on:
         description: GitHub Actions runner OS
         type: string
         required: false
-        default: "macos-11"
+        default: "macos-12"
       builder_ref:
         description: Git ref to checkout of build-emacs-for-macos
         required: false
diff --git a/.github/workflows/_release.yml b/.github/workflows/_release.yml
index da2e0e9..af15146 100644
--- a/.github/workflows/_release.yml
+++ b/.github/workflows/_release.yml
@@ -8,7 +8,7 @@ on:
         description: GitHub Actions runner OS
         type: string
         required: false
-        default: "macos-11"
+        default: "macos-12"
       plan_artifact:
         description: Name of artifact containing a emacs-builder plan yaml file
         type: string
@@ -21,6 +21,11 @@ on:
         description: "Test build name"
         type: string
         required: false
+      update_casks:
+        description: "Update casks in homebrew tap?"
+        type: boolean
+        required: true
+        default: true
     secrets:
       TAP_REPO_TOKEN:
         description: Personal Access Token for Homebrew Tap repo
@@ -57,7 +62,10 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Trigger update casks workflow in homebrew tap
-        if: ${{ steps.dmg.outputs.result != 'fail' && inputs.test_build_name == '' }}
+        if: >-
+          steps.dmg.outputs.result != 'fail' &&
+          inputs.test_build_name == '' &&
+          inputs.update_casks
         run: >-
           gh workflow run --repo jimeh/homebrew-emacs-builds update-casks.yml
         env:
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 924b5a6..c794952 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -19,9 +19,9 @@ on:
         required: false
         default: ""
       os:
-        description: 'Runner OS ("macos-11", "macos-12", or "macos-latest")'
+        description: 'Runner OS ("macos-12", "macos-13", or "macos-latest")'
         required: true
-        default: "macos-11"
+        default: "macos-12"
       test_build_name:
         description: "Test build name"
         required: false
@@ -62,7 +62,7 @@ jobs:
     needs: [prepare]
     with:
       os: ${{ github.event.inputs.os }}
-      build_os: "macos-11"
+      build_os: "macos-12"
       artifact_prefix: "x86_64-"
       git_ref: ${{ github.event.inputs.git_ref }}
       git_sha: ${{ github.event.inputs.git_sha }}
@@ -89,6 +89,7 @@ jobs:
       plan_artifact: x86_64-build-plan
       dmg_artifact: x86_64-dmg
       test_build_name: ${{ github.event.inputs.test_build_name }}
+      update_casks: true
     secrets:
       TAP_REPO_TOKEN: ${{ secrets.TAP_REPO_TOKEN }}
 
@@ -130,5 +131,6 @@ jobs:
       plan_artifact: arm64-build-plan
       dmg_artifact: arm64-dmg
       test_build_name: ${{ github.event.inputs.test_build_name }}
+      update_casks: false
     secrets:
       TAP_REPO_TOKEN: ${{ secrets.TAP_REPO_TOKEN }}
diff --git a/.github/workflows/nightly-master.yml b/.github/workflows/nightly-master.yml
index 081f31a..f4e38e1 100644
--- a/.github/workflows/nightly-master.yml
+++ b/.github/workflows/nightly-master.yml
@@ -31,7 +31,7 @@ jobs:
     uses: ./.github/workflows/_build.yml
     needs: [prepare]
     with:
-      build_os: "macos-11"
+      build_os: "macos-12"
       artifact_prefix: "x86_64-"
       git_ref: "master"
       git_sha: ${{ github.event.inputs.git_sha }}
@@ -53,6 +53,7 @@ jobs:
     with:
       plan_artifact: x86_64-build-plan
       dmg_artifact: x86_64-dmg
+      update_casks: true
     secrets:
       TAP_REPO_TOKEN: ${{ secrets.TAP_REPO_TOKEN }}
 
@@ -88,5 +89,6 @@ jobs:
     with:
       plan_artifact: arm64-build-plan
       dmg_artifact: arm64-dmg
+      update_casks: false
     secrets:
       TAP_REPO_TOKEN: ${{ secrets.TAP_REPO_TOKEN }}