diff --git a/CHANGELOG.md b/CHANGELOG.md
index d4f997a..2299d5b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,10 +7,11 @@ and this project adheres to
 [Haskell Package Versioning Policy](https://pvp.haskell.org/).
 
 
-## [1.3.8] - 2023-08-13
+## [1.4.0] - 2024-10-21
+
+* Bump stack version to lts-21.25 and GHC-9.4.8
+* Change effect system to `effectful` one
 
-* Land on `effectful` effect system. Remove polysemy
-* Bump stack version to lts-20.26 and GHC-9.2.8
 
 ## [1.3.7] - 2023-04-06
 
diff --git a/README.md b/README.md
index 405dfca..a54ebbc 100644
--- a/README.md
+++ b/README.md
@@ -117,4 +117,4 @@ or use arrows of keyboard.
 
 ## Contribution
 
-Contribution is welcome!
+Contributions are welcoming!