diff --git a/.github/workflows/python-test.yml b/.github/workflows/python-test.yml
index c575b93..154cf33 100644
--- a/.github/workflows/python-test.yml
+++ b/.github/workflows/python-test.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
 
     steps:
     - uses: actions/checkout@v4
diff --git a/pyproject.toml b/pyproject.toml
index e2b6356..f7a01fa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,7 +15,7 @@ classifiers = [
     "License :: OSI Approved :: MIT License",
     "Operating System :: OS Independent",
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 dependencies = [
     "pandas>=1.5",
     "pyarrow>=10",
@@ -51,7 +51,7 @@ cotdata = ["*.yaml"]
 
 [tool.ruff]
 line-length = 100
-target-version = "py39"
+target-version = "py310"
 
 [tool.ruff.lint]
 select = ["E", "F", "W", "I"]