diff --git a/Main.hs b/Main.hs
--- a/Main.hs
+++ b/Main.hs
@@ -4,7 +4,11 @@
 
 import Distribution.Package
 import Distribution.PackageDescription
+#if MIN_VERSION_Cabal(2,2,0)
+import Distribution.PackageDescription.Parsec
+#else
 import Distribution.PackageDescription.Parse
+#endif
 import Distribution.PackageDescription.PrettyPrint
 #if MIN_VERSION_Cabal(1,25,0)
 import Distribution.Types.Dependency
@@ -15,7 +19,7 @@
 import System.Environment
 
 main :: IO ()
-main = getArgs >>= mapM_ (\cabalFile -> readPackageDescription silent cabalFile >>= writeGenericPackageDescription cabalFile . stripVersionRestrictions)
+main = getArgs >>= mapM_ (\cabalFile -> readGenericPackageDescription silent cabalFile >>= writeGenericPackageDescription cabalFile . stripVersionRestrictions)
 
 -- We don't relax version restrictions inside conditional statements.
 -- See https://github.com/peti/jailbreak-cabal/commit/99eac40deb481b185fd93fd307625369ff5e1ec0
@@ -62,4 +66,9 @@
 instance DependencyType LegacyExeDependency where
   relax (LegacyExeDependency d _) = LegacyExeDependency d anyVersion
 
+#endif
+
+#if !MIN_VERSION_Cabal(2,0,0)
+readGenericPackageDescription :: Verbosity -> String -> IO GenericPackageDescription
+readGenericPackageDescription = readPackageDescription
 #endif
diff --git a/jailbreak-cabal.cabal b/jailbreak-cabal.cabal
--- a/jailbreak-cabal.cabal
+++ b/jailbreak-cabal.cabal
@@ -1,25 +1,19 @@
--- This file has been generated from package.yaml by hpack version 0.15.0.
---
--- see: https://github.com/sol/hpack
-
 name:                   jailbreak-cabal
-version:                1.3.2
-synopsis:               Strip version restrictions from build dependencies in Cabal files.
+version:                1.3.3
+synopsis:               Strip version restrictions from Cabal files
 description:            Strip version restrictions from build dependencies in Cabal files.
 category:               Distribution
 stability:              stable
 homepage:               https://github.com/peti/jailbreak-cabal#readme
 bug-reports:            https://github.com/peti/jailbreak-cabal/issues
-author:                 Peter Simons,
-                        Joel Taylor,
-                        Nikolay Amiantov,
-                        aszlig
-maintainer:             Peter Simons <simons@cryp.to>
+author:                 Peter Simons, Joel Taylor, Nikolay Amiantov, aszlig
+maintainer:             simons@cryp.to
 license:                BSD3
 license-file:           LICENSE
-tested-with:            GHC > 7 && <= 8.1
 build-type:             Simple
 cabal-version:          >= 1.10
+tested-with:            GHC == 7.0.4, GHC == 7.4.2, GHC == 7.6.3, GHC == 7.8.4, GHC == 7.10.3
+                      , GHC == 8.0.2, GHC == 8.2.2, GHC == 8.4.1
 
 source-repository head
   type: git
@@ -27,8 +21,5 @@
 
 executable jailbreak-cabal
   main-is: Main.hs
-  ghc-options: -Wall
-  build-depends:
-    base >= 3 && < 5,
-    Cabal == 1.20.* || >= 1.23
+  build-depends: base < 5, Cabal == 1.20.* || >= 1.23
   default-language: Haskell2010