diff --git a/docs/changelog.rst b/docs/changelog.rst
index f3e1acf08..a82008a49 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -28,7 +28,7 @@ They may change at any time.
 9.1
 ...
 
-*In development*
+*May 27, 2021*
 
 .. note::
 
diff --git a/docs/conf.py b/docs/conf.py
index dad7475f7..2246c0287 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -59,9 +59,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '9.0'
+version = '9.1'
 # The full version, including alpha/beta/rc tags.
-release = '9.0'
+release = '9.1'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/src/websockets/version.py b/src/websockets/version.py
index 02dbe9d3c..a7901ef92 100644
--- a/src/websockets/version.py
+++ b/src/websockets/version.py
@@ -1 +1 @@
-version = "9.0.2"
+version = "9.1"