diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index d85bef1..eaff1cc 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -7,7 +7,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.9", "3.12"]
 
     runs-on: ubuntu-latest
 
diff --git a/pyproject.toml b/pyproject.toml
index cf4bfc5..c8d7711 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,6 +19,7 @@ classifiers = [
     "Topic :: Scientific/Engineering :: GIS",
     "Topic :: Utilities",
 ]
+requires-python = ">=3.9"
 dependencies = ["geopandas>=1.0", "numpy", "pandas", "shapely>=2.0"]
 
 [project.optional-dependencies]