diff --git a/servant-zeppelin.cabal b/servant-zeppelin.cabal
--- a/servant-zeppelin.cabal
+++ b/servant-zeppelin.cabal
@@ -1,33 +1,37 @@
-name: servant-zeppelin
-version: 0.1.0.2
-cabal-version: >=1.10
-build-type: Simple
-license: BSD3
-license-file: LICENSE
-copyright: 2017 Martin Allen, Ben Weitzman
-maintainer: martin[dot]allen26[at]gmail.com
-homepage: https://github.com/martyall/servant-zeppelin#readme
-synopsis: Types and definitions of servant-zeppelin combinators.
-category: Web
-author: Martin Allen, Ben Weitzman
-extra-source-files:
-    README.md
-
-source-repository head
-    type: git
-    location: https://github.com/martyall/servant-zeppelin
+name:                servant-zeppelin
+version:             0.1.0.3
+homepage:            https://github.com/martyall/servant-zeppelin#readme
+license:             BSD3
+license-file:        LICENSE
+author:              Martin Allen, Ben Weitzman
+maintainer:          martin[dot]allen26[at]gmail.com
+copyright:           2017 Martin Allen, Ben Weitzman
+synopsis:            Types and definitions of servant-zeppelin combinators.
+category:            Web
+build-type:          Simple
+extra-source-files:  README.md
+cabal-version:       >=1.10
 
 library
-    exposed-modules:
-        Servant.Zeppelin
-        Servant.Zeppelin.Internal.Types
-    build-depends:
-        base >=4.7 && <5,
-        singletons ==2.2.*
-    default-language: Haskell2010
-    default-extensions: GADTs KindSignatures FlexibleInstances
-                        PolyKinds DataKinds TypeOperators TypeFamilies TypeInType
-                        MultiParamTypeClasses ConstraintKinds FunctionalDependencies
-                        StandaloneDeriving
-    hs-source-dirs: src
+  hs-source-dirs:      src
+  exposed-modules:     Servant.Zeppelin
+                     , Servant.Zeppelin.Internal.Types
+  build-depends:       base >= 4.7 && < 5
+                     , singletons >= 2.2 && <= 2.3 
+  default-language:    Haskell2010
+  default-extensions:  GADTs
+                     , KindSignatures
+                     , FlexibleInstances
+                     , PolyKinds
+                     , DataKinds
+                     , TypeOperators
+                     , TypeFamilies
+                     , TypeInType
+                     , MultiParamTypeClasses
+                     , ConstraintKinds
+                     , FunctionalDependencies
+                     , StandaloneDeriving
 
+source-repository head
+  type:     git
+  location: https://github.com/martyall/servant-zeppelin