diff --git a/CHANGELOG.md b/CHANGELOG.md
index d75fee5..9199be5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Change Log
 
-## Unreleased
+## 5.5.0
 
 New error codes:
 * Introduce Y067: Don't use `Incomplete | None = None`.
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 26774a1..5a83212 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -26,7 +26,7 @@ however, we advise setting up a virtual environment first:
 
     $ python3 -m venv env
     $ source env/bin/activate
-    $ pip install -e --group=dev
+    $ pip install -e . --group=dev
 
 To format your code with `isort` and `black`, run: