diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 214de73..7aa8f40 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,9 +11,9 @@ jobs:
       matrix:
         include:
           - python-version: "3.7"
-            os: ubuntu-latest
+            os: ubuntu-20.04
           - python-version: "3.8"
-            os: ubuntu-latest
+            os: ubuntu-20.04
           - python-version: "3.9"
             os: ubuntu-latest
           - python-version: "3.10"
@@ -22,6 +22,8 @@ jobs:
             os: ubuntu-latest
           - python-version: "3.12"
             os: ubuntu-latest
+          - python-version: "3.13"
+            os: ubuntu-latest
           - python-version: "pypy3.9"
             os: windows-latest
 
diff --git a/setup.cfg b/setup.cfg
index 04df847..a099330 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -19,6 +19,7 @@ classifiers =
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3.11
     Programming Language :: Python :: 3.12
+    Programming Language :: Python :: 3.13
     Programming Language :: Python :: Implementation :: CPython
     Programming Language :: Python :: Implementation :: PyPy