diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+2.8.3
+---
+
+- `mtl-2.3` and `transformers-0.6` support (see [#235](https://github.com/GetShopTV/swagger2/pull/235), [#236](https://github.com/GetShopTV/swagger2/pull/236));
+
 2.8.2
 ---
 
diff --git a/src/Data/Swagger/Declare.hs b/src/Data/Swagger/Declare.hs
--- a/src/Data/Swagger/Declare.hs
+++ b/src/Data/Swagger/Declare.hs
@@ -16,7 +16,6 @@
 
 import Control.Monad
 import Control.Monad.Cont (ContT)
-import Control.Monad.List (ListT)
 import Control.Monad.Reader (ReaderT)
 import Control.Monad.Trans
 import Control.Monad.Trans.Except (ExceptT)
diff --git a/src/Data/Swagger/Internal/Schema.hs b/src/Data/Swagger/Internal/Schema.hs
--- a/src/Data/Swagger/Internal/Schema.hs
+++ b/src/Data/Swagger/Internal/Schema.hs
@@ -27,7 +27,7 @@
 import Data.Data.Lens (template)
 
 import Control.Monad
-import Control.Monad.Writer
+import Control.Monad.Writer hiding (First, Last)
 import Data.Aeson (ToJSON (..), ToJSONKey (..), ToJSONKeyFunction (..), Value (..), Object(..))
 import Data.Char
 import Data.Data (Data)
@@ -46,6 +46,7 @@
 import Data.Scientific (Scientific)
 import Data.Fixed (Fixed, HasResolution, Pico)
 import Data.Set (Set)
+import Data.Semigroup
 import qualified Data.Text as T
 import qualified Data.Text.Lazy as TL
 import Data.Time
diff --git a/swagger2.cabal b/swagger2.cabal
--- a/swagger2.cabal
+++ b/swagger2.cabal
@@ -1,6 +1,6 @@
 cabal-version:       >=1.10
 name:                swagger2
-version:             2.8.2
+version:             2.8.3
 
 synopsis:            Swagger 2.0 data model
 category:            Web, Swagger
@@ -64,10 +64,10 @@
     , containers       >=0.5.7.1   && <0.7
     , template-haskell >=2.11.1.0  && <2.19
     , time             >=1.6.0.1   && <1.14
-    , transformers     >=0.5.2.0   && <0.6
+    , transformers     >=0.5.2.0   && <0.7
 
   build-depends:
-      mtl              >=2.2.2   && <2.3
+      mtl              >=2.2.2   && <2.4
     , text             >=1.2.3.0 && <2.1
 
   -- other dependencies