diff --git a/.azure-pipelines/azure-pipelines-osx.yml b/.azure-pipelines/azure-pipelines-osx.yml
index 904ee2a..7ab4aed 100755
--- a/.azure-pipelines/azure-pipelines-osx.yml
+++ b/.azure-pipelines/azure-pipelines-osx.yml
@@ -5,7 +5,7 @@
 jobs:
 - job: osx
   pool:
-    vmImage: macOS-11
+    vmImage: macOS-12
   strategy:
     matrix:
       osx_64_python3.10.____cpython:
diff --git a/.ci_support/osx_64_python3.10.____cpython.yaml b/.ci_support/osx_64_python3.10.____cpython.yaml
index ddf7410..a1b95c4 100644
--- a/.ci_support/osx_64_python3.10.____cpython.yaml
+++ b/.ci_support/osx_64_python3.10.____cpython.yaml
@@ -1,9 +1,11 @@
 MACOSX_DEPLOYMENT_TARGET:
-- '10.12'
+- '10.13'
+MACOSX_SDK_VERSION:
+- '10.13'
 c_stdlib:
 - macosx_deployment_target
 c_stdlib_version:
-- '10.12'
+- '10.13'
 channel_sources:
 - conda-forge
 channel_targets:
diff --git a/.ci_support/osx_64_python3.11.____cpython.yaml b/.ci_support/osx_64_python3.11.____cpython.yaml
index f59ab48..b3e5e7b 100644
--- a/.ci_support/osx_64_python3.11.____cpython.yaml
+++ b/.ci_support/osx_64_python3.11.____cpython.yaml
@@ -1,9 +1,11 @@
 MACOSX_DEPLOYMENT_TARGET:
-- '10.12'
+- '10.13'
+MACOSX_SDK_VERSION:
+- '10.13'
 c_stdlib:
 - macosx_deployment_target
 c_stdlib_version:
-- '10.12'
+- '10.13'
 channel_sources:
 - conda-forge
 channel_targets:
diff --git a/.ci_support/osx_64_python3.12.____cpython.yaml b/.ci_support/osx_64_python3.12.____cpython.yaml
index c248455..6a390f8 100644
--- a/.ci_support/osx_64_python3.12.____cpython.yaml
+++ b/.ci_support/osx_64_python3.12.____cpython.yaml
@@ -1,9 +1,11 @@
 MACOSX_DEPLOYMENT_TARGET:
-- '10.12'
+- '10.13'
+MACOSX_SDK_VERSION:
+- '10.13'
 c_stdlib:
 - macosx_deployment_target
 c_stdlib_version:
-- '10.12'
+- '10.13'
 channel_sources:
 - conda-forge
 channel_targets:
diff --git a/.ci_support/osx_64_python3.9.____73_pypy.yaml b/.ci_support/osx_64_python3.9.____73_pypy.yaml
index 1edb841..779f51b 100644
--- a/.ci_support/osx_64_python3.9.____73_pypy.yaml
+++ b/.ci_support/osx_64_python3.9.____73_pypy.yaml
@@ -1,9 +1,11 @@
 MACOSX_DEPLOYMENT_TARGET:
-- '10.12'
+- '10.13'
+MACOSX_SDK_VERSION:
+- '10.13'
 c_stdlib:
 - macosx_deployment_target
 c_stdlib_version:
-- '10.12'
+- '10.13'
 channel_sources:
 - conda-forge
 channel_targets:
diff --git a/.ci_support/osx_64_python3.9.____cpython.yaml b/.ci_support/osx_64_python3.9.____cpython.yaml
index f705118..eb84582 100644
--- a/.ci_support/osx_64_python3.9.____cpython.yaml
+++ b/.ci_support/osx_64_python3.9.____cpython.yaml
@@ -1,9 +1,11 @@
 MACOSX_DEPLOYMENT_TARGET:
-- '10.12'
+- '10.13'
+MACOSX_SDK_VERSION:
+- '10.13'
 c_stdlib:
 - macosx_deployment_target
 c_stdlib_version:
-- '10.12'
+- '10.13'
 channel_sources:
 - conda-forge
 channel_targets:
diff --git a/.ci_support/osx_arm64_python3.10.____cpython.yaml b/.ci_support/osx_arm64_python3.10.____cpython.yaml
index 1de2760..bd69b48 100644
--- a/.ci_support/osx_arm64_python3.10.____cpython.yaml
+++ b/.ci_support/osx_arm64_python3.10.____cpython.yaml
@@ -1,5 +1,7 @@
 MACOSX_DEPLOYMENT_TARGET:
 - '11.0'
+MACOSX_SDK_VERSION:
+- '11.0'
 c_stdlib:
 - macosx_deployment_target
 c_stdlib_version:
diff --git a/.ci_support/osx_arm64_python3.11.____cpython.yaml b/.ci_support/osx_arm64_python3.11.____cpython.yaml
index 6e3f8eb..494b6f9 100644
--- a/.ci_support/osx_arm64_python3.11.____cpython.yaml
+++ b/.ci_support/osx_arm64_python3.11.____cpython.yaml
@@ -1,5 +1,7 @@
 MACOSX_DEPLOYMENT_TARGET:
 - '11.0'
+MACOSX_SDK_VERSION:
+- '11.0'
 c_stdlib:
 - macosx_deployment_target
 c_stdlib_version:
diff --git a/.ci_support/osx_arm64_python3.12.____cpython.yaml b/.ci_support/osx_arm64_python3.12.____cpython.yaml
index 3a43a92..e37d2a7 100644
--- a/.ci_support/osx_arm64_python3.12.____cpython.yaml
+++ b/.ci_support/osx_arm64_python3.12.____cpython.yaml
@@ -1,5 +1,7 @@
 MACOSX_DEPLOYMENT_TARGET:
 - '11.0'
+MACOSX_SDK_VERSION:
+- '11.0'
 c_stdlib:
 - macosx_deployment_target
 c_stdlib_version:
diff --git a/.ci_support/osx_arm64_python3.9.____cpython.yaml b/.ci_support/osx_arm64_python3.9.____cpython.yaml
index b829ba5..af81950 100644
--- a/.ci_support/osx_arm64_python3.9.____cpython.yaml
+++ b/.ci_support/osx_arm64_python3.9.____cpython.yaml
@@ -1,5 +1,7 @@
 MACOSX_DEPLOYMENT_TARGET:
 - '11.0'
+MACOSX_SDK_VERSION:
+- '11.0'
 c_stdlib:
 - macosx_deployment_target
 c_stdlib_version:
diff --git a/.gitattributes b/.gitattributes
index 7f32763..18f114a 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -20,8 +20,8 @@ bld.bat text eol=crlf
 .travis.yml linguist-generated=true
 .scripts/* linguist-generated=true
 .woodpecker.yml linguist-generated=true
-LICENSE.txt linguist-generated=true
-README.md linguist-generated=true
+/LICENSE.txt linguist-generated=true
+/README.md linguist-generated=true
 azure-pipelines.yml linguist-generated=true
 build-locally.py linguist-generated=true
 shippable.yml linguist-generated=true
diff --git a/recipe/conda_build_config.yaml b/recipe/conda_build_config.yaml
index 8883a4c..fc8115b 100644
--- a/recipe/conda_build_config.yaml
+++ b/recipe/conda_build_config.yaml
@@ -1,2 +1,2 @@
-MACOSX_DEPLOYMENT_TARGET:
-  - '10.12'  # [osx and x86]
+c_stdlib_version:          # [osx and x86]
+  - '10.13'                # [osx and x86]
diff --git a/recipe/meta.yaml b/recipe/meta.yaml
index b97f667..b42d0cc 100644
--- a/recipe/meta.yaml
+++ b/recipe/meta.yaml
@@ -1,5 +1,5 @@
 {% set name = "libcst" %}
-{% set version = "1.3.1" %}
+{% set version = "1.4.0" %}
 
 package:
   name: libcst
@@ -7,7 +7,7 @@ package:
 
 source:
   url: https://pypi.io/packages/source/{{ name[0] }}/{{ name }}/libcst-{{ version }}.tar.gz
-  sha256: 03b1df1ae02456f1d465fcd5ead1d0d454bb483caefd8c8e6bde515ffdb53d1b
+  sha256: 449e0b16604f054fa7f27c3ffe86ea7ef6c409836fe68fe4e752a1894175db00
   patches:
     - 0001-Add-headerpad_max_install_names-to-linker-arguments.patch
 
@@ -25,6 +25,7 @@ requirements:
     - python                                 # [build_platform != target_platform]
     - cross-python_{{ target_platform }}     # [build_platform != target_platform]
     - {{ compiler('rust') }}
+    - {{ stdlib('c') }}
     - cargo-bundle-licenses
   host:
     - python