diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1d3cc21..b0d106e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## UNRELEASED
+## 0.2.2 (2025-10-20)
 
 - Modernize the repo to use `pyproject.toml`.
 - Update docs.
diff --git a/pyproject.toml b/pyproject.toml
index 8a45a39..77ff31f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,6 +36,16 @@ dependencies = [
 ]
 dynamic = ["version"]
 
+[project.optional-dependencies]
+testing = [
+    "coverage>=7.0,<8.0",
+    "pycodestyle>=2.10,<3.0",
+    "pytest>=7.0,<8.0",
+    "pytest-cov>=4.0,<5.0",
+    "pytest-doctestplus>=1.0,<2.0",
+    "tox>=4.0,<5.0",
+]
+
 [project.urls]
 Documentation = "https://projectpanoptes.org/"
 Source = "https://github.com/panoptes/panoptes-data/"