diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,9 @@
 # Changelog for aeson-with
 
+## v0.1.2.0
+
+* Remove useless dependencies on `mtl` and `hashmap`.
+
 ## v0.1.1.0
 
 * Add `view'` and `toListOf'` for viewing `ToJSON` instances.
diff --git a/aeson-with.cabal b/aeson-with.cabal
--- a/aeson-with.cabal
+++ b/aeson-with.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           aeson-with
-version:        0.1.1.2
+version:        0.1.2.0
 synopsis:       withXField combinators for aeson
 description:    Silly little withXField combinators for adding fields to an existing JSON value.
 category:       Data
@@ -34,10 +34,8 @@
   build-depends:
       aeson
     , base >=4.7 && <5
-    , hashmap
     , lens
     , lens-aeson
-    , mtl
     , scientific
     , text
     , unordered-containers
diff --git a/src/Data/Aeson/With.hs b/src/Data/Aeson/With.hs
--- a/src/Data/Aeson/With.hs
+++ b/src/Data/Aeson/With.hs
@@ -28,9 +28,11 @@
 import           Data.Text
 import qualified Data.Vector       as V
 
+-- | Version of `view` for any `ToJSON`.
 view' :: ToJSON a => Getting c Value c -> a -> c
 view' f = view f . toJSON
 
+-- | Version of `toListOf` for any `ToJSON`.
 toListOf' :: ToJSON a1 => Getting (Endo [a2]) Value a2 -> a1 -> [a2]
 toListOf' f = toListOf f . toJSON