diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 333361ba..0cfb4b4b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,6 +25,9 @@ jobs:
           - name: Linux
             runs-on: ubuntu-latest
             tox: linux
+          - name: macOS
+            runs-on: macos-latest
+            tox: macos
           - name: Windows
             runs-on: windows-latest
             tox: windows
diff --git a/PyQt5-stubs/QtCore.pyi b/PyQt5-stubs/QtCore.pyi
index 920504a9..8e74e0eb 100644
--- a/PyQt5-stubs/QtCore.pyi
+++ b/PyQt5-stubs/QtCore.pyi
@@ -12850,6 +12850,127 @@ class QSysInfo(sip.simplewrapper):
         @staticmethod
         def windowsVersion() -> 'QSysInfo.WinVersion': ...
 
+    if sys.platform == "darwin":
+        class MacVersion(int):
+            MV_10_0 = ...  # type: int
+            MV_10_1 = ...  # type: int
+            MV_10_10 = ...  # type: int
+            MV_10_11 = ...  # type: int
+            MV_10_12 = ...  # type: int
+            MV_10_2 = ...  # type: int
+            MV_10_3 = ...  # type: int
+            MV_10_4 = ...  # type: int
+            MV_10_5 = ...  # type: int
+            MV_10_6 = ...  # type: int
+            MV_10_7 = ...  # type: int
+            MV_10_8 = ...  # type: int
+            MV_10_9 = ...  # type: int
+            MV_9 = ...  # type: int
+            MV_CHEETAH = ...  # type: int
+            MV_ELCAPITAN = ...  # type: int
+            MV_IOS = ...  # type: int
+            MV_IOS_10_0 = ...  # type: int
+            MV_IOS_4_3 = ...  # type: int
+            MV_IOS_5_0 = ...  # type: int
+            MV_IOS_5_1 = ...  # type: int
+            MV_IOS_6_0 = ...  # type: int
+            MV_IOS_6_1 = ...  # type: int
+            MV_IOS_7_0 = ...  # type: int
+            MV_IOS_7_1 = ...  # type: int
+            MV_IOS_8_0 = ...  # type: int
+            MV_IOS_8_1 = ...  # type: int
+            MV_IOS_8_2 = ...  # type: int
+            MV_IOS_8_3 = ...  # type: int
+            MV_IOS_8_4 = ...  # type: int
+            MV_IOS_9_0 = ...  # type: int
+            MV_IOS_9_1 = ...  # type: int
+            MV_IOS_9_2 = ...  # type: int
+            MV_IOS_9_3 = ...  # type: int
+            MV_JAGUAR = ...  # type: int
+            MV_LEOPARD = ...  # type: int
+            MV_LION = ...  # type: int
+            MV_MAVERICKS = ...  # type: int
+            MV_MOUNTAINLION = ...  # type: int
+            MV_PANTHER = ...  # type: int
+            MV_PUMA = ...  # type: int
+            MV_SIERRA = ...  # type: int
+            MV_SNOWLEOPARD = ...  # type: int
+            MV_TIGER = ...  # type: int
+            MV_TVOS = ...  # type: int
+            MV_TVOS_10_0 = ...  # type: int
+            MV_TVOS_9_0 = ...  # type: int
+            MV_TVOS_9_1 = ...  # type: int
+            MV_TVOS_9_2 = ...  # type: int
+            MV_Unknown = ...  # type: int
+            MV_WATCHOS = ...  # type: int
+            MV_WATCHOS_2_0 = ...  # type: int
+            MV_WATCHOS_2_1 = ...  # type: int
+            MV_WATCHOS_2_2 = ...  # type: int
+            MV_WATCHOS_3_0 = ...  # type: int
+            MV_YOSEMITE = ...  # type: int
+
+        MV_10_0 = ...  # type: int
+        MV_10_1 = ...  # type: int
+        MV_10_10 = ...  # type: int
+        MV_10_11 = ...  # type: int
+        MV_10_12 = ...  # type: int
+        MV_10_2 = ...  # type: int
+        MV_10_3 = ...  # type: int
+        MV_10_4 = ...  # type: int
+        MV_10_5 = ...  # type: int
+        MV_10_6 = ...  # type: int
+        MV_10_7 = ...  # type: int
+        MV_10_8 = ...  # type: int
+        MV_10_9 = ...  # type: int
+        MV_9 = ...  # type: int
+        MV_CHEETAH = ...  # type: int
+        MV_ELCAPITAN = ...  # type: int
+        MV_IOS = ...  # type: int
+        MV_IOS_10_0 = ...  # type: int
+        MV_IOS_4_3 = ...  # type: int
+        MV_IOS_5_0 = ...  # type: int
+        MV_IOS_5_1 = ...  # type: int
+        MV_IOS_6_0 = ...  # type: int
+        MV_IOS_6_1 = ...  # type: int
+        MV_IOS_7_0 = ...  # type: int
+        MV_IOS_7_1 = ...  # type: int
+        MV_IOS_8_0 = ...  # type: int
+        MV_IOS_8_1 = ...  # type: int
+        MV_IOS_8_2 = ...  # type: int
+        MV_IOS_8_3 = ...  # type: int
+        MV_IOS_8_4 = ...  # type: int
+        MV_IOS_9_0 = ...  # type: int
+        MV_IOS_9_1 = ...  # type: int
+        MV_IOS_9_2 = ...  # type: int
+        MV_IOS_9_3 = ...  # type: int
+        MV_JAGUAR = ...  # type: int
+        MV_LEOPARD = ...  # type: int
+        MV_LION = ...  # type: int
+        MV_MAVERICKS = ...  # type: int
+        MV_MOUNTAINLION = ...  # type: int
+        MV_PANTHER = ...  # type: int
+        MV_PUMA = ...  # type: int
+        MV_SIERRA = ...  # type: int
+        MV_SNOWLEOPARD = ...  # type: int
+        MV_TIGER = ...  # type: int
+        MV_TVOS = ...  # type: int
+        MV_TVOS_10_0 = ...  # type: int
+        MV_TVOS_9_0 = ...  # type: int
+        MV_TVOS_9_1 = ...  # type: int
+        MV_TVOS_9_2 = ...  # type: int
+        MV_Unknown = ...  # type: int
+        MV_WATCHOS = ...  # type: int
+        MV_WATCHOS_2_0 = ...  # type: int
+        MV_WATCHOS_2_1 = ...  # type: int
+        MV_WATCHOS_2_2 = ...  # type: int
+        MV_WATCHOS_3_0 = ...  # type: int
+        MV_YOSEMITE = ...  # type: int
+
+        MacintoshVersion = ... # type: QSysInfo.MacVersion
+
+        @staticmethod
+        def macVersion() -> 'QSysInfo.MacVersion': ...
+
     @typing.overload
     def __init__(self) -> None: ...
     @typing.overload
diff --git a/stubtest.allowlist.macos b/stubtest.allowlist.macos
new file mode 100644
index 00000000..40df1961
--- /dev/null
+++ b/stubtest.allowlist.macos
@@ -0,0 +1,7 @@
+# Linux only
+PyQt5.QtX11Extras
+
+# To review
+PyQt5.QtGui.QDrag.cancel
+PyQt5.QtWidgets.QMacCocoaViewContainer
+PyQt5.QtWidgets.QMenu.setAsDockMenu
diff --git a/tox.ini b/tox.ini
index 1e11e711..726866b3 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,8 +5,9 @@ envlist = py3{6,7,8,9,10}-{windows,linux}
 deps =
   pip>=20.0
 setenv:
-  windows: OS_MARKER = windows
   linux: OS_MARKER = linux
+  macos: OS_MARKER = macos
+  windows: OS_MARKER = windows
 extras =
   dev
 commands =