diff --git a/Changes.md b/Changes.md
index 5ac0d03..daef9d5 100644
--- a/Changes.md
+++ b/Changes.md
@@ -1,4 +1,4 @@
-## WIP  TBD
+## v0.9.0  2024-09-03
 
  * Adding `maps.Flip`, `maps.FlipSlice`, and `sets.FlipMap`.
  * Adding `sets.All`, `sets.Any`, and `sets.None`.
diff --git a/version.txt b/version.txt
index b19b521..f979ade 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-v0.8.0
+v0.9.0