diff --git a/docs/conf.py b/docs/conf.py
index ffe61f7ba..d22b85a82 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -26,7 +26,7 @@
 author = "Aymeric Augustin"
 
 # The full version, including alpha/beta/rc tags
-release = "9.1"
+release = "10.0"
 
 
 # -- General configuration ---------------------------------------------------
diff --git a/docs/project/changelog.rst b/docs/project/changelog.rst
index 736dfde41..90e08728b 100644
--- a/docs/project/changelog.rst
+++ b/docs/project/changelog.rst
@@ -28,7 +28,7 @@ They may change at any time.
 10.0
 ----
 
-*In development*
+*September 9, 2021*
 
 Backwards-incompatible changes
 ..............................
diff --git a/src/websockets/version.py b/src/websockets/version.py
index a7901ef92..168f8b054 100644
--- a/src/websockets/version.py
+++ b/src/websockets/version.py
@@ -1 +1 @@
-version = "9.1"
+version = "10.0"