diff --git a/.envrc b/.envrc
new file mode 100755
index 0000000..1b4b3d6
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+set -eo pipefail
+shopt -s inherit_errexit
+
+watch_file venv/bin/activate
+
+if [[ -f "venv/bin/activate" ]]; then
+    source venv/bin/activate
+fi
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index c63892b..3818efb 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -9,7 +9,7 @@ jobs:
     - uses: actions/checkout@v4
     - uses: actions/setup-python@v5
       with:
-        python-version: '3.11'
+        python-version: '3.12'
         architecture: x64
     - run: make build
     - run: venv-tools/bin/twine upload dist/*
diff --git a/.python-version b/.python-version
new file mode 100644
index 0000000..e4fba21
--- /dev/null
+++ b/.python-version
@@ -0,0 +1 @@
+3.12