diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 1a48ee0f..9b88b4e9 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -31,9 +31,9 @@ jobs:
         python-version: ["3.11", "3.12"]
         include:
           - { os: ubuntu-latest, python-version: "3.10" }
-          # - os: ubuntu-latest
-          #   python-version: "3.13"
-          #   python-install-version: "3.13-dev"
+          - os: ubuntu-latest
+            python-version: "3.13"
+            python-install-version: "3.13-dev"
     runs-on: ${{ matrix.os }}
     steps:
       - name: Clone the repo
@@ -75,9 +75,9 @@ jobs:
         python-version: ["3.11", "3.12"]
         include:
           - { os: ubuntu-latest, python-version: "3.10" }
-          # - os: ubuntu-latest
-          #   python-version: "3.13"
-          #   python-install-version: "3.13-dev"
+          - os: ubuntu-latest
+            python-version: "3.13"
+            python-install-version: "3.13-dev"
     runs-on: ${{ matrix.os }}
     steps:
       - name: Clone the repo
diff --git a/noxfile.py b/noxfile.py
index 96f994c6..34c0ed49 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -2,6 +2,7 @@
 
 import json
 import os
+import tempfile
 from importlib.metadata import Distribution
 from pathlib import Path
 
@@ -11,7 +12,7 @@
 nox.options.error_on_external_run = True
 
 
-def install_coverage_hook(session: nox.Session):
+def _install_coverage_hook(session: nox.Session):
     session.run(
         'python',
         '-c',
@@ -27,6 +28,28 @@ def install_coverage_hook(session: nox.Session):
     )
 
 
+def _session_install_for_python313(session: nox.Session, install_args: list[str]):
+    with tempfile.TemporaryDirectory() as temp_dir:
+        constraints_txt = Path(temp_dir, 'python313-constraints.txt')
+        constraints_txt.write_text("""\
+sqlalchemy @ git+https://github.com/sqlalchemy/sqlalchemy ; python_version >= "3.13"
+truststore @ git+https://github.com/sethmlarson/truststore@support-for-python-313 ; python_version >= "3.13"
+""")
+
+        session.install(
+            '-c',
+            os.fspath(constraints_txt),
+            *install_args,
+            env={f'{p}_NO_EXTENSIONS': '1' for p in ['AIOHTTP', 'MULTIDICT', 'YARL']},
+        )
+
+
+@nox.session(reuse_venv=True)
+def dev_env(session: nox.Session):
+    _session_install_for_python313(session, ['-e', '.[gui, test, types]'])
+    print(session.virtualenv.bin, end='')
+
+
 @nox.session(name='format')
 def format_code(session: nox.Session):
     "Format source code."
@@ -70,21 +93,25 @@ def test(session: nox.Session, minimum_versions: bool):
                 wheel_metadata_json,
             )['wheel-path']
 
-    install_requires = [
+    install_args = [
         f'instawow[gui, test] @ {package_path}',
         'instawow_test_plugin @ tests/plugin',
     ]
-
     if minimum_versions:
         (package_metadata,) = Distribution.discover(name='instawow', path=[package_path])
-
-        session.install(
-            '--resolution', 'lowest-direct', *install_requires, *package_metadata.requires or ()
+        _session_install_for_python313(
+            session,
+            [
+                '--resolution',
+                'lowest-direct',
+                *install_args,
+                *(package_metadata.requires or ()),
+            ],
         )
     else:
-        session.install(*install_requires)
+        _session_install_for_python313(session, install_args)
 
-    install_coverage_hook(session)
+    _install_coverage_hook(session)
 
     session.run(
         *'coverage run -m pytest -n auto'.split(),
@@ -117,7 +144,11 @@ def type_check(session: nox.Session):
                 wheel_metadata_json,
             )['wheel-path']
 
-    session.install(f'instawow[gui, types] @ {package_path}')
+    _session_install_for_python313(
+        session,
+        [f'instawow[gui, types] @ {package_path}'],
+    )
+
     session.run('npx', 'pyright', external=True)
 
 
@@ -165,7 +196,6 @@ def publish_dists(session: nox.Session):
 def freeze_cli(session: nox.Session):
     import argparse
     import shutil
-    import tempfile
 
     PYAPP_VERSION = 'v0.15.1'
 
diff --git a/shell.nix b/shell.nix
index e9bc19ca..dd11d136 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,33 +1,24 @@
 { pkgs ? import <nixpkgs> { } }:
 let
-  python = pkgs.python312;
-  venvDir = toString ./venvs + ("/" + python.pythonVersion);
+  python = pkgs.python313.override { enableGIL = false; enableOptimizations = true; };
 in
 pkgs.mkShell {
   buildInputs = [
-    pkgs.nixpkgs-fmt
-    pkgs.nodejs_20
     pkgs.nil
+    pkgs.nixpkgs-fmt
+    pkgs.nodejs_21
+    pkgs.python312.pkgs.nox
     pkgs.uv
     python
-    python.pkgs.venvShellHook
   ];
 
   SOURCE_DATE_EPOCH = "315532800"; # The year 1980
   PYTHONBREAKPOINT = "IPython.terminal.debugger.set_trace";
 
   shellHook = ''
-    if [ -d "${venvDir}" ]; then
-      echo "Skipping venv creation, '${venvDir}' already exists"
-    else
-      echo "Creating new venv environment in path: '${venvDir}'"
-      # Note that the module venv was only introduced in python 3, so for 2.7
-      # this needs to be replaced with a call to virtualenv
-      uv venv "${venvDir}"
-    fi
-
-    source "${venvDir}/bin/activate"
+    set -ex
 
-    AIOHTTP_NO_EXTENSIONS=1 MULTIDICT_NO_EXTENSIONS=1 CC=clang++ uv pip install nox -e ".[gui, test, types]"
+    VENV_BIN_DIR=$(nox -vv -s dev_env --force-python ${python.pythonVersion})
+    source "$VENV_BIN_DIR/activate"
   '';
 }