diff --git a/.github/workflows/build-darwin.yml b/.github/workflows/build-darwin.yml
index 9dc02b91f7..e16be8814f 100644
--- a/.github/workflows/build-darwin.yml
+++ b/.github/workflows/build-darwin.yml
@@ -9,7 +9,7 @@ on:
     inputs:
       runs-on:
         type: string
-        default: macos-12-large
+        default: macos-13-large
       tag:
         type: string
         required: true
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e7acf37682..203190c58f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -84,7 +84,7 @@ jobs:
     uses: ./.github/workflows/build-darwin.yml
     secrets: inherit
     with:
-      runs-on: ${{ github.repository_owner == 'oven-sh' && 'macos-12-large' || 'macos-12' }}
+      runs-on: ${{ github.repository_owner == 'oven-sh' && 'macos-13-large' || 'macos-13' }}
       tag: darwin-x64
       arch: x64
       cpu: haswell
@@ -95,7 +95,7 @@ jobs:
     uses: ./.github/workflows/build-darwin.yml
     secrets: inherit
     with:
-      runs-on: ${{ github.repository_owner == 'oven-sh' && 'macos-12-large' || 'macos-12' }}
+      runs-on: ${{ github.repository_owner == 'oven-sh' && 'macos-13-large' || 'macos-13' }}
       tag: darwin-x64-baseline
       arch: x64
       cpu: nehalem
@@ -106,7 +106,7 @@ jobs:
     uses: ./.github/workflows/build-darwin.yml
     secrets: inherit
     with:
-      runs-on: ${{ github.repository_owner == 'oven-sh' && 'namespace-profile-bun-ci-darwin-aarch64' || 'macos-12' }}
+      runs-on: ${{ github.repository_owner == 'oven-sh' && 'namespace-profile-bun-ci-darwin-aarch64' || 'macos-13' }}
       tag: darwin-aarch64
       arch: aarch64
       cpu: native
@@ -175,7 +175,7 @@ jobs:
     with:
       run-id: ${{ inputs.run-id }}
       pr-number: ${{ github.event.number }}
-      runs-on: ${{ github.repository_owner == 'oven-sh' && 'macos-12-large' || 'macos-12' }}
+      runs-on: ${{ github.repository_owner == 'oven-sh' && 'macos-13-large' || 'macos-13' }}
       tag: darwin-x64
   darwin-x64-baseline-test:
     if: ${{ inputs.run-id || github.event_name == 'pull_request' }}
@@ -186,7 +186,7 @@ jobs:
     with:
       run-id: ${{ inputs.run-id }}
       pr-number: ${{ github.event.number }}
-      runs-on: ${{ github.repository_owner == 'oven-sh' && 'macos-12-large' || 'macos-12' }}
+      runs-on: ${{ github.repository_owner == 'oven-sh' && 'macos-13-large' || 'macos-13' }}
       tag: darwin-x64-baseline
   darwin-aarch64-test:
     if: ${{ inputs.run-id || github.event_name == 'pull_request' }}
@@ -197,7 +197,7 @@ jobs:
     with:
       run-id: ${{ inputs.run-id }}
       pr-number: ${{ github.event.number }}
-      runs-on: ${{ github.repository_owner == 'oven-sh' && 'namespace-profile-bun-ci-darwin-aarch64' || 'macos-12' }}
+      runs-on: ${{ github.repository_owner == 'oven-sh' && 'namespace-profile-bun-ci-darwin-aarch64' || 'macos-13' }}
       tag: darwin-aarch64
   windows-x64-test:
     if: ${{ inputs.run-id || github.event_name == 'pull_request' }}
diff --git a/.github/workflows/create-release-build.yml b/.github/workflows/create-release-build.yml
index e9aa5796fe..42adea0585 100644
--- a/.github/workflows/create-release-build.yml
+++ b/.github/workflows/create-release-build.yml
@@ -90,7 +90,7 @@ jobs:
     uses: ./.github/workflows/build-darwin.yml
     secrets: inherit
     with:
-      runs-on: ${{ github.repository_owner == 'oven-sh' && 'macos-12-large' || 'macos-12' }}
+      runs-on: ${{ github.repository_owner == 'oven-sh' && 'macos-13-large' || 'macos-13' }}
       tag: darwin-x64
       arch: x64
       cpu: haswell
@@ -100,7 +100,7 @@ jobs:
     uses: ./.github/workflows/build-darwin.yml
     secrets: inherit
     with:
-      runs-on: ${{ github.repository_owner == 'oven-sh' && 'macos-12-large' || 'macos-12' }}
+      runs-on: ${{ github.repository_owner == 'oven-sh' && 'macos-13-large' || 'macos-13' }}
       tag: darwin-x64-baseline
       arch: x64
       cpu: nehalem
@@ -110,7 +110,7 @@ jobs:
     uses: ./.github/workflows/build-darwin.yml
     secrets: inherit
     with:
-      runs-on: ${{ github.repository_owner == 'oven-sh' && 'namespace-profile-bun-ci-darwin-aarch64' || 'macos-12' }}
+      runs-on: ${{ github.repository_owner == 'oven-sh' && 'namespace-profile-bun-ci-darwin-aarch64' || 'macos-13' }}
       tag: darwin-aarch64
       arch: aarch64
       cpu: native
diff --git a/.github/workflows/run-lint-cpp.yml b/.github/workflows/run-lint-cpp.yml
index 12abea144b..7aae7eaacb 100644
--- a/.github/workflows/run-lint-cpp.yml
+++ b/.github/workflows/run-lint-cpp.yml
@@ -17,7 +17,7 @@ on:
 jobs:
   lint-cpp:
     name: Lint C++
-    runs-on: ${{ github.repository_owner == 'oven-sh' && 'macos-13-xlarge' || 'macos-12' }}
+    runs-on: ${{ github.repository_owner == 'oven-sh' && 'macos-13-xlarge' || 'macos-13' }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 70b8f52b67..18981fd5cd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -72,7 +72,7 @@ endif()
 
 # --- MacOS SDK ---
 if(APPLE AND DEFINED ENV{CI})
-    set(CMAKE_OSX_DEPLOYMENT_TARGET "12.0")
+    set(CMAKE_OSX_DEPLOYMENT_TARGET "13.0")
 endif()
 
 if(APPLE AND NOT CMAKE_OSX_DEPLOYMENT_TARGET)
diff --git a/Makefile b/Makefile
index 5f941249a9..c997d7da7b 100644
--- a/Makefile
+++ b/Makefile
@@ -26,7 +26,7 @@ ifeq ($(ARCH_NAME_RAW),arm64)
 ARCH_NAME = aarch64
 DOCKER_BUILDARCH = arm64
 BREW_PREFIX_PATH = /opt/homebrew
-DEFAULT_MIN_MACOS_VERSION = 11.0
+DEFAULT_MIN_MACOS_VERSION = 13.0
 MARCH_NATIVE = -mtune=$(CPU_TARGET)
 ifeq ($(OS_NAME),linux)
 MARCH_NATIVE = -march=armv8-a+crc -mtune=ampere1
diff --git a/scripts/env.sh b/scripts/env.sh
index e86241c515..658f16ba8b 100755
--- a/scripts/env.sh
+++ b/scripts/env.sh
@@ -90,7 +90,7 @@ if [[ $(uname -s) == 'Linux' ]]; then
 fi
 
 if [[ $(uname -s) == 'Darwin' ]]; then
-  export CMAKE_OSX_DEPLOYMENT_TARGET=${CMAKE_OSX_DEPLOYMENT_TARGET:-12.0}
+  export CMAKE_OSX_DEPLOYMENT_TARGET=${CMAKE_OSX_DEPLOYMENT_TARGET:-13.0}
 
   CMAKE_FLAGS+=(-DCMAKE_OSX_DEPLOYMENT_TARGET=${CMAKE_OSX_DEPLOYMENT_TARGET})
   export CFLAGS="$CFLAGS -mmacosx-version-min=${CMAKE_OSX_DEPLOYMENT_TARGET} -D__DARWIN_NON_CANCELABLE=1 "
diff --git a/src/bun.js/RuntimeTranspilerCache.zig b/src/bun.js/RuntimeTranspilerCache.zig
index 9b57d24fb6..551659c6e0 100644
--- a/src/bun.js/RuntimeTranspilerCache.zig
+++ b/src/bun.js/RuntimeTranspilerCache.zig
@@ -201,7 +201,7 @@ pub const RuntimeTranspilerCache = struct {
 
                     try metadata.encode(metadata_stream.writer());
 
-                    if (comptime bun.Environment.allow_assert) {
+                    if (comptime bun.Environment.isDebug) {
                         var metadata_stream2 = std.io.fixedBufferStream(metadata_buf[0..Metadata.size]);
                         var metadata2 = Metadata{};
                         metadata2.decode(metadata_stream2.reader()) catch |err| bun.Output.panic("Metadata did not roundtrip encode -> decode  successfully: {s}", .{@errorName(err)});