diff --git a/.github/workflows/test_py.yaml b/.github/workflows/test_py.yaml
index 675fe8d..8d562dc 100644
--- a/.github/workflows/test_py.yaml
+++ b/.github/workflows/test_py.yaml
@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.10"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v2
diff --git a/pyproject.toml b/pyproject.toml
index 5a43e24..20eb3fa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ version = "0.5.1"
 description = "A rusty mutex watershed"
 readme = "README.md"
 
-requires-python = ">=3.11"
+requires-python = ">=3.9"
 classifiers = [
     'Development Status :: 2 - Pre-Alpha',
     'Intended Audience :: Developers',