diff --git a/.github/workflows/python-build.yml b/.github/workflows/python-build.yml
index 92bb208..abc7656 100644
--- a/.github/workflows/python-build.yml
+++ b/.github/workflows/python-build.yml
@@ -13,10 +13,6 @@ jobs:
       fail-fast: false
       matrix:
         cfg:
-          - { os: windows-latest, architecture: x64, python-version: "3.9" }
-          - { os: windows-latest, architecture: x86, python-version: "3.9" }
-          - { os: macos-13, architecture: x64, python-version: "3.9" }
-          - { os: macos-latest, architecture: arm64, python-version: "3.9" }
           - { os: windows-latest, architecture: x64, python-version: "3.10" }
           - { os: windows-latest, architecture: x86, python-version: "3.10" }
           - { os: macos-13, architecture: x64, python-version: "3.10" }
diff --git a/.github/workflows/python-unittests.yml b/.github/workflows/python-unittests.yml
index 4dea0aa..88bfab6 100644
--- a/.github/workflows/python-unittests.yml
+++ b/.github/workflows/python-unittests.yml
@@ -18,11 +18,6 @@ jobs:
     strategy:
       matrix:
         cfg:
-          - { os: windows-latest, architecture: x64, python-version: "3.9" }
-          - { os: windows-latest, architecture: x86, python-version: "3.9" }
-          - { os: macos-13, architecture: x64, python-version: "3.9" }
-          - { os: macos-latest, architecture: arm64, python-version: "3.9" }
-          - { os: ubuntu-latest, architecture: x64, python-version: "3.9" }
           - { os: windows-latest, architecture: x64, python-version: "3.10" }
           - { os: windows-latest, architecture: x86, python-version: "3.10" }
           - { os: macos-13, architecture: x64, python-version: "3.10" }
diff --git a/setup.cfg b/setup.cfg
index 3ccf09e..3326d5f 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -16,7 +16,7 @@ platforms = any
 packages = find_namespace:
 package_dir =
     = src
-python_requires = ~=3.9
+python_requires = ~=3.10
 
 [options.packages.find]
 where = src
diff --git a/setup.py b/setup.py
index 3ce93bf..acc697e 100644
--- a/setup.py
+++ b/setup.py
@@ -39,8 +39,8 @@
 
     if sys.platform == "darwin":
         define_macros.append(("OS_MACOSX", None))
-        # shared_mutex needs MacOS 10.12+
-        extra_compile_args.append("-mmacosx-version-min=10.12")
+        # shared_mutex needs MacOS 10.12+, filesystem needs 10.15
+        extra_compile_args.append("-mmacosx-version-min=10.15")
         extra_compile_args.append("-Werror=partial-availability")
         extra_link_args.append("-Wl,-no_weak_imports")
 else: