diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 5c485f4..f746a1c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -19,7 +19,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu, macos, windows]
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14-dev"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14", "3.15"]
 
     steps:
       - uses: actions/checkout@v7
diff --git a/pyproject.toml b/pyproject.toml
index 40b0f38..b33208e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "yaml2ics"
 version = "0.4dev0"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 authors = [{name = "Scientific Python Developers"}]
 readme = "README.md"
 license = {file = "LICENSE"}
@@ -13,21 +13,21 @@ classifiers = [
   "Development Status :: 4 - Beta",
   "License :: OSI Approved :: BSD License",
   "Programming Language :: Python :: 3",
-  "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
   "Programming Language :: Python :: 3.13",
   "Programming Language :: Python :: 3.14",
+  "Programming Language :: Python :: 3.15",
 ]
 description = "CLI to convert yaml into ics."
 
 dependencies = [
     "ics-vtimezones == 2020.2",
-    "ics == 0.8.0.dev0",
-    "python-dateutil >= 2.8",
+    "ics == 0.8.0.dev1",
+    "python-dateutil >= 2.9",
     "pyyaml >= 6",
-    "importlib-resources >= 5.2.1",
+    "importlib-resources >= 6.4",
     "tzdata; platform_system == 'Windows'"
 ]