diff --git a/.github/workflows/python.yaml b/.github/workflows/python.yaml
index 7c1fadd..2d914e3 100644
--- a/.github/workflows/python.yaml
+++ b/.github/workflows/python.yaml
@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       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' ]
 
     steps:
       - uses: actions/checkout@v4
diff --git a/.gitignore b/.gitignore
index 82d23bc..1ef15ac 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,5 @@ __pycache__
 .tox
 
 .env*
+
+.direnv/*
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..3c35347
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+python 3.13.2
diff --git a/README.md b/README.md
index 02fe6ac..28ab842 100644
--- a/README.md
+++ b/README.md
@@ -58,15 +58,21 @@ See the [GitHub 'enhancement' issues](https://github.com/buildkite/test-collecto
 
 ## ⚒ Developing
 
-After cloning the repository, install the dependencies:
+After cloning the repository, setup virtual environment (please skip this step if you are using `direnv`):
 
+```bash
+python -m venv .venv && source .venv/bin/activate
 ```
+
+then install the dependencies:
+
+```bash
 pip install -e '.[dev]'
 ```
 
 And run the tests:
 
-```
+```bash
 pytest
 ```