diff --git a/CHANGELOG.md b/CHANGELOG.md
index 198f9411b..99a3c5e37 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 ## master
 
+## 1.2.1 (2022-10-22)
+
+### Type checker core
+
+* Fix type narrowing on case-when ([#662](https://github.com/soutaro/steep/pull/662))
+
 ## 1.2.0 (2022-10-08)
 
 ### Commandline tool
diff --git a/Gemfile.lock b/Gemfile.lock
index a8c53de05..b187f4dcd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    steep (1.2.0)
+    steep (1.2.1)
       activesupport (>= 5.1)
       csv (>= 3.0.9)
       fileutils (>= 1.1.0)
diff --git a/lib/steep/version.rb b/lib/steep/version.rb
index a4dcfaf47..603b41c48 100644
--- a/lib/steep/version.rb
+++ b/lib/steep/version.rb
@@ -1,3 +1,3 @@
 module Steep
-  VERSION = "1.2.0"
+  VERSION = "1.2.1"
 end