diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index dd1aba2..3accfe7 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -19,7 +19,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu, macos, windows]
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12-dev"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13-dev"]
 
     steps:
       - uses: actions/checkout@v4
diff --git a/pyproject.toml b/pyproject.toml
index 3bcca81..6f2dc91 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,14 +17,16 @@ classifiers = [
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
 ]
 description = "CLI to convert yaml into ics."
 
 dependencies = [
-    "ics-vtimezones == 2020.1",
+    "ics-vtimezones == 2020.2",
     "ics == 0.8.0.dev0",
     "python-dateutil >= 2.8",
     "pyyaml >= 6",
+    "importlib-resources >= 5.2.1"
 ]
 
 [project.optional-dependencies]