diff --git a/pkgs/development/haskell-modules/patches/encoding-Cabal-2.0.patch b/pkgs/development/haskell-modules/patches/encoding-Cabal-2.0.patch
deleted file mode 100644
index 510e450945b8..000000000000
--- a/pkgs/development/haskell-modules/patches/encoding-Cabal-2.0.patch
+++ /dev/null
@@ -1,67 +0,0 @@
-From 67bb87ceff53f0178c988dd4e15eeb2daee92b84 Mon Sep 17 00:00:00 2001
-From: Gregor Kleen <pngwjpgh@users.noreply.github.com>
-Date: Tue, 20 Feb 2018 17:46:24 +0100
-Subject: [PATCH] Relax upper version bounds on dependencies
-
----
- Setup.hs       | 20 ++++++++++++++++----
- encoding.cabal |  4 ++--
- stack.yaml     |  4 ++--
- 3 files changed, 20 insertions(+), 8 deletions(-)
-
-diff --git a/Setup.hs b/Setup.hs
-index de719e6..fe5b84c 100644
---- a/Setup.hs
-+++ b/Setup.hs
-@@ -1,13 +1,25 @@
-+{-# LANGUAGE CPP #-}
-+
- module Main where
- 
- import Distribution.Simple
- import Data.Encoding.Preprocessor.Mapping
- import Data.Encoding.Preprocessor.XMLMappingBuilder
- 
-+#if MIN_VERSION_Cabal(2,0,0)
-+main = defaultMainWithHooks (simpleUserHooks
-+                             {hookedPreProcessors = ( ("mapping" , \_ _ _ -> mappingPreprocessor)
-+                                                    : ("mapping2", \_ _ _ -> mappingPreprocessor)
-+                                                    : ("xml"     , \_ _ _ -> xmlPreprocessor)
-+                                                    : (hookedPreProcessors simpleUserHooks)
-+                                                    )
-+                             })
-+#else
- main = defaultMainWithHooks (simpleUserHooks
--                             {hookedPreProcessors = (("mapping",\_ _ -> mappingPreprocessor)
--                                                     :("mapping2",\_ _ -> mappingPreprocessor)
--                                                     :("xml",\_ _ -> xmlPreprocessor)
--                                                     :(hookedPreProcessors simpleUserHooks)
-+                             {hookedPreProcessors = ( ("mapping" , \_ _ -> mappingPreprocessor)
-+                                                    : ("mapping2", \_ _ -> mappingPreprocessor)
-+                                                    : ("xml"     , \_ _ -> xmlPreprocessor)
-+                                                    : (hookedPreProcessors simpleUserHooks)
-                                                     )
-                              })
-+#endif
-diff --git a/encoding.cabal b/encoding.cabal
-index ec20617..f221715 100644
---- a/encoding.cabal
-+++ b/encoding.cabal
-@@ -36,7 +36,7 @@ Source-Repository this
- 
- Custom-Setup
-   Setup-Depends: base >=3 && <5,
--                 Cabal >=1.24 && <1.25,
-+                 Cabal >=1.24 && <2.1,
-                  containers,
-                  filepath,
-                  ghc-prim,
-@@ -51,7 +51,7 @@ Library
-                  extensible-exceptions >=0.1 && <0.2,
-                  ghc-prim >=0.3 && <0.6,
-                  mtl >=2.0 && <2.3,
--                 regex-compat >=0.71 && <0.95
-+                 regex-compat >=0.71 && <0.96
- 
-   Extensions: CPP
-