diff --git a/CHANGELOG.md b/CHANGELOG.md
index 869d08b..36be770 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,7 @@
 Releases
 ========
 
-v0.3.1 (unreleased)
+v0.3.1 (2017-05-31)
 -------------------
 
 -   Support multierr 1.0.