diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+#### 0.10.0.3
+
+* Allow `mtl == 2.2.*`
+
 #### 0.10.0.1
 
 * Bump `Cabal` upper bound to `< 1.22`
diff --git a/rest-gen.cabal b/rest-gen.cabal
--- a/rest-gen.cabal
+++ b/rest-gen.cabal
@@ -1,90 +1,93 @@
-Name:               rest-gen
-Version:            0.10.0.2
-Description:        Documentation and client generation from rest definition.
-Synopsis:           Documentation and client generation from rest definition.
-Maintainer:         code@silk.co
-Category:           Web
-Build-Type:         Simple
-Cabal-Version:      >= 1.8
-License:            BSD3
-License-File:       LICENSE
-Data-Dir:           files
-Data-Files:         Docs/*.st
-                    Docs/*.js
-                    Docs/*.css
-                    Javascript/base.js
-                    Ruby/base.rb
-Extra-Source-Files: CHANGELOG.md
-
-Library
-  GHC-Options:     -Wall
-  Hs-Source-Dirs:   src
-  Build-Depends:
-
-      base                      >= 4.5     &&  < 4.8
-    , HStringTemplate           >= 0.6     &&  < 0.8
-    , attoparsec                >= 0.10    &&  < 0.12
-    , aeson                     >= 0.7     &&  < 0.8
-    , aeson-utils               == 0.2.*
-    , blaze-html                >= 0.5     &&  < 0.8
-    , bytestring                >= 0.9     &&  < 0.11
-    , Cabal                     >= 1.18    &&  < 1.22
-    , code-builder              == 0.1.*
-    , containers                >= 0.4     &&  < 0.6
-    , directory                 >= 1.1     &&  < 1.3
-    , fclabels                  >= 1.0.4   &&  < 2.1
-    , filepath                  >= 1.2     &&  < 1.4
-    , generic-aeson             == 0.1.*
-    , happstack-server          >= 7.0.5   &&  < 7.4
-    , hashable                  >= 1.1     &&  < 1.3
-    , hslogger                  >= 1.1     &&  < 1.3
-    , hxt                       >= 9.2     &&  < 9.4
-    , json-schema               == 0.4.*
-    , mtl                       >= 2.0     &&  < 2.2
-    , pretty                    >= 1.0     &&  < 1.2
-    , process                   >= 1.0     &&  < 1.3
-    , regular                   == 0.3.*
-    , rest-core                 >= 0.29    &&  < 0.31
-    , rest-types                == 1.10.*
-    , safe                      >= 0.2     &&  < 0.4
-    , split                     >= 0.1     &&  < 0.3
-    , tagged                    >= 0.2     &&  < 0.8
-    , text                      >= 0.11    &&  < 1.2
-    , unordered-containers      == 0.2.*
-    , utf8-string               == 0.3.*
-    , vector                    == 0.10.*
+name:                rest-gen
+version:             0.10.0.3
+description:         Documentation and client generation from rest definition.
+synopsis:            Documentation and client generation from rest definition.
+maintainer:          code@silk.co
+category:            Web
+build-type:          Simple
+cabal-version:       >= 1.8
+license:             BSD3
+license-file:        LICENSE
+data-dir:            files
 
-  Exposed-Modules:  Rest.Gen
-                    Rest.Gen.Base
-                    Rest.Gen.Base.ActionInfo
-                    Rest.Gen.Base.ActionInfo.Ident
-                    Rest.Gen.Base.ApiTree
-                    Rest.Gen.Base.JSON
-                    Rest.Gen.Base.JSON.Pretty
-                    Rest.Gen.Base.Link
-                    Rest.Gen.Base.XML
-                    Rest.Gen.Config
-                    Rest.Gen.Docs.Generate
-                    Rest.Gen.Docs.Happstack
-                    Rest.Gen.Haskell.Generate
-                    Rest.Gen.JavaScript.Generate
-                    Rest.Gen.Ruby.Generate
-                    Rest.Gen.Utils
+data-files:
+  Docs/*.st
+  Docs/*.js
+  Docs/*.css
+  Javascript/base.js
+  Ruby/base.rb
+extra-source-files:
+  CHANGELOG.md
+  LICENSE
 
-  Other-Modules: Paths_rest_gen
+source-repository head
+  type:              git
+  location:          https://github.com/silkapp/rest.git
 
-Test-suite rest-gen-tests
-  build-depends:       base                 >= 4.5    && < 4.8
-                     , HUnit                == 1.2.*
-                     , rest-core            >= 0.29   &&  < 0.31
-                     , rest-gen
-                     , test-framework       == 0.8.*
-                     , test-framework-hunit == 0.3.*
-  hs-source-dirs:      tests
-  main-is:             Runner.hs
-  type:                exitcode-stdio-1.0
-  ghc-options:         -Wall
+library
+  ghc-options:       -Wall
+  hs-source-dirs:    src
+  other-modules:     Paths_rest_gen
+  exposed-modules:
+    Rest.Gen
+    Rest.Gen.Base
+    Rest.Gen.Base.ActionInfo
+    Rest.Gen.Base.ActionInfo.Ident
+    Rest.Gen.Base.ApiTree
+    Rest.Gen.Base.JSON
+    Rest.Gen.Base.JSON.Pretty
+    Rest.Gen.Base.Link
+    Rest.Gen.Base.XML
+    Rest.Gen.Config
+    Rest.Gen.Docs.Generate
+    Rest.Gen.Docs.Happstack
+    Rest.Gen.Haskell.Generate
+    Rest.Gen.JavaScript.Generate
+    Rest.Gen.Ruby.Generate
+    Rest.Gen.Utils
+  build-depends:
+      base >= 4.5 && < 4.8
+    , Cabal >= 1.18 && < 1.22
+    , HStringTemplate >= 0.6 && < 0.8
+    , aeson >= 0.7 && < 0.8
+    , aeson-utils == 0.2.*
+    , attoparsec >= 0.10 && < 0.12
+    , blaze-html >= 0.5 && < 0.8
+    , bytestring >= 0.9 && < 0.11
+    , code-builder == 0.1.*
+    , containers >= 0.4 && < 0.6
+    , directory >= 1.1 && < 1.3
+    , fclabels >= 1.0.4 && < 2.1
+    , filepath >= 1.2 && < 1.4
+    , generic-aeson == 0.1.*
+    , happstack-server >= 7.0.5 && < 7.4
+    , hashable >= 1.1 && < 1.3
+    , hslogger >= 1.1 && < 1.3
+    , hxt >= 9.2 && < 9.4
+    , json-schema == 0.4.*
+    , mtl >= 2.0 && < 2.3
+    , pretty >= 1.0 && < 1.2
+    , process >= 1.0 && < 1.3
+    , regular == 0.3.*
+    , rest-core >= 0.29 && < 0.31
+    , rest-types == 1.10.*
+    , safe >= 0.2 && < 0.4
+    , split >= 0.1 && < 0.3
+    , tagged >= 0.2 && < 0.8
+    , text >= 0.11 && < 1.2
+    , unordered-containers == 0.2.*
+    , utf8-string == 0.3.*
+    , vector == 0.10.*
 
-Source-repository head
-  Type:              Git
-  Location:          https://github.com/silkapp/rest.git
+test-suite rest-gen-tests
+  hs-source-dirs:    tests
+  main-is:           Runner.hs
+  type:              exitcode-stdio-1.0
+  ghc-options:       -Wall
+  build-depends:
+      base >= 4.5 && < 4.8
+    , HUnit == 1.2.*
+    , rest-core >= 0.29 && < 0.31
+    , rest-gen
+    , test-framework == 0.8.*
+    , test-framework-hunit == 0.3.*