diff --git a/CHANGELOG.md b/CHANGELOG.md
index dbc1d70..f4a209d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 ## UNRELEASED
 
+## 0.4.1
+
+## Fixed
+
+- Fixed `ModInt::operator~` and `ConstantModInt<mod>::operator~` when the modulo number is not prime.
+
 ## 0.4.0
 
 ## Added