diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index becb1171..1e3528c7 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -7,7 +7,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
         os: [ubuntu-latest]
     runs-on: ${{ matrix.os }}
     timeout-minutes: 5
diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 15a1d815..c9e55a48 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -7,7 +7,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
         os: [macos-latest, windows-latest, ubuntu-latest]
     runs-on: ${{ matrix.os }}
     timeout-minutes: 15
diff --git a/noxfile.py b/noxfile.py
index 042a31f3..db1871c9 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -6,7 +6,7 @@
 
 import nox
 
-python_versions = ["3.8", "3.9", "3.10", "3.11", "3.12"]
+python_versions = ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 
 # Use 'uv' to manager Nox' virtualenvs, if available
 if shutil.which("uv"):
diff --git a/pyproject.toml b/pyproject.toml
index 1a017112..9222d596 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Utilities",
     "Typing :: Typed",
 ]
diff --git a/shell.nix b/shell.nix
index f0275d45..39ecb161 100644
--- a/shell.nix
+++ b/shell.nix
@@ -9,8 +9,8 @@
   },
   pkgs ? import (builtins.fetchTarball {
     # Branch: nixos-unstable
-    url = "https://github.com/NixOS/nixpkgs/archive/c75037bbf9093a2acb617804ee46320d6d1fea5a.tar.gz";
-    sha256 = "1hs4rfylv0f1sbyhs1hf4f7jsq4np498fbcs5xjlmrkwhx4lpgmc";
+    url = "https://github.com/NixOS/nixpkgs/archive/62939616bcc4da119f15eed184b124a9383fcf56.tar.gz";
+    sha256 = "1nl40n5bbnzwyx1074g38py638s55d2bsn04ynlz9ix1r5f0nv6x";
   }) { overlays = [ old_pythons_overlay ]; }
 }:
 pkgs.mkShell {
@@ -21,6 +21,7 @@ pkgs.mkShell {
     python310
     python311
     python312
+    python313
     poetry
 
     # Allow installation of binary wheels by (a) providing manylinux2014