diff --git a/ChangeLog.md b/ChangeLog.md
new file mode 100644
index 0000000..5daf6b3
--- /dev/null
+++ b/ChangeLog.md
@@ -0,0 +1,5 @@
+# Changelog for sonic
+
+## 0.1
+
+* Initial release.
diff --git a/src/Sonic/Constraints.hs b/src/Sonic/Constraints.hs
index 31f7498..c496403 100644
--- a/src/Sonic/Constraints.hs
+++ b/src/Sonic/Constraints.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE RecordWildCards, FlexibleInstances, OverlappingInstances, RankNTypes #-}
+{-# LANGUAGE RecordWildCards, FlexibleInstances, RankNTypes #-}
 module Sonic.Constraints where
 
 import Protolude hiding (head)
diff --git a/src/Sonic/Utils.hs b/src/Sonic/Utils.hs
index faec3a4..1237c2d 100644
--- a/src/Sonic/Utils.hs
+++ b/src/Sonic/Utils.hs
@@ -1,7 +1,6 @@
 {-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
-{-# LANGUAGE OverlappingInstances #-}
 {-# LANGUAGE ViewPatterns #-}
 {-# LANGUAGE DeriveAnyClass, DeriveGeneric #-}
 module Sonic.Utils where