diff --git a/docs/project/changelog.rst b/docs/project/changelog.rst
index 615d3ab7..7e4bce9c 100644
--- a/docs/project/changelog.rst
+++ b/docs/project/changelog.rst
@@ -30,7 +30,7 @@ notice.
 13.1
 ----
 
-*In development*
+*September 21, 2024*
 
 Backwards-incompatible changes
 ..............................
diff --git a/src/websockets/version.py b/src/websockets/version.py
index bbda56d6..00b0a985 100644
--- a/src/websockets/version.py
+++ b/src/websockets/version.py
@@ -18,7 +18,7 @@
 # When tagging a release, set `released = True`.
 # After tagging a release, set `released = False` and increment `tag`.
 
-released = False
+released = True
 
 tag = version = commit = "13.1"