diff --git a/Data/Attoparsec/ByteString.hs b/Data/Attoparsec/ByteString.hs
index 0de9bc0..c70892f 100644
--- a/Data/Attoparsec/ByteString.hs
+++ b/Data/Attoparsec/ByteString.hs
@@ -1,7 +1,5 @@
 {-# LANGUAGE CPP #-}
-#if __GLASGOW_HASKELL__ >= 702
 {-# LANGUAGE Trustworthy #-}
-#endif
 -- |
 -- Module      :  Data.Attoparsec.ByteString
 -- Copyright   :  Bryan O'Sullivan 2007-2015
diff --git a/Data/Attoparsec/ByteString/Char8.hs b/Data/Attoparsec/ByteString/Char8.hs
index b4f6b57..8e6bd20 100644
--- a/Data/Attoparsec/ByteString/Char8.hs
+++ b/Data/Attoparsec/ByteString/Char8.hs
@@ -1,8 +1,6 @@
 {-# LANGUAGE BangPatterns, CPP, FlexibleInstances, TypeFamilies,
     TypeSynonymInstances, GADTs #-}
-#if __GLASGOW_HASKELL__ >= 702
 {-# LANGUAGE Trustworthy #-} -- Imports internal modules
-#endif
 {-# OPTIONS_GHC -fno-warn-orphans -fno-warn-warnings-deprecations #-}
 
 -- |
diff --git a/Data/Attoparsec/ByteString/Lazy.hs b/Data/Attoparsec/ByteString/Lazy.hs
index 73b7de4..3d3eeba 100644
--- a/Data/Attoparsec/ByteString/Lazy.hs
+++ b/Data/Attoparsec/ByteString/Lazy.hs
@@ -1,7 +1,5 @@
 {-# LANGUAGE CPP #-}
-#if __GLASGOW_HASKELL__ >= 702
 {-# LANGUAGE Trustworthy #-} -- Imports internal modules
-#endif
 
 -- |
 -- Module      :  Data.Attoparsec.ByteString.Lazy
diff --git a/Data/Attoparsec/Combinator.hs b/Data/Attoparsec/Combinator.hs
index 3ec004e..a352947 100644
--- a/Data/Attoparsec/Combinator.hs
+++ b/Data/Attoparsec/Combinator.hs
@@ -1,7 +1,5 @@
 {-# LANGUAGE BangPatterns, CPP #-}
-#if __GLASGOW_HASKELL__ >= 702
 {-# LANGUAGE Trustworthy #-} -- Imports internal modules
-#endif
 -- |
 -- Module      :  Data.Attoparsec.Combinator
 -- Copyright   :  Daan Leijen 1999-2001, Bryan O'Sullivan 2007-2015
diff --git a/Data/Attoparsec/Text.hs b/Data/Attoparsec/Text.hs
index bb8ef29..da59ecf 100644
--- a/Data/Attoparsec/Text.hs
+++ b/Data/Attoparsec/Text.hs
@@ -1,7 +1,5 @@
 {-# LANGUAGE BangPatterns, CPP, FlexibleInstances, TypeSynonymInstances #-}
-#if __GLASGOW_HASKELL__ >= 702
 {-# LANGUAGE Trustworthy #-} -- Imports internal modules
-#endif
 {-# OPTIONS_GHC -fno-warn-warnings-deprecations #-}
 
 -- |
diff --git a/Data/Attoparsec/Text/Lazy.hs b/Data/Attoparsec/Text/Lazy.hs
index 79ac057..7dcb369 100644
--- a/Data/Attoparsec/Text/Lazy.hs
+++ b/Data/Attoparsec/Text/Lazy.hs
@@ -1,7 +1,5 @@
 {-# LANGUAGE CPP #-}
-#if __GLASGOW_HASKELL__ >= 702
 {-# LANGUAGE Trustworthy #-} -- Imports internal modules
-#endif
 
 {-# OPTIONS_GHC -fno-warn-warnings-deprecations #-}
 -- |
diff --git a/Data/Attoparsec/Zepto.hs b/Data/Attoparsec/Zepto.hs
index da2c244..ffede9c 100644
--- a/Data/Attoparsec/Zepto.hs
+++ b/Data/Attoparsec/Zepto.hs
@@ -1,7 +1,5 @@
 {-# LANGUAGE CPP #-}
-#if __GLASGOW_HASKELL__ >= 702
 {-# LANGUAGE Trustworthy #-} -- Data.ByteString.Unsafe
-#endif
 {-# LANGUAGE BangPatterns #-}
 
 -- |
diff --git a/attoparsec.cabal b/attoparsec.cabal
index 6793556..f04b41e 100644
--- a/attoparsec.cabal
+++ b/attoparsec.cabal
@@ -78,11 +78,7 @@ library
                  scientific >= 0.3.1 && < 0.4,
                  transformers >= 0.2 && (< 0.4 || >= 0.4.1.0) && < 0.7,
                  text >= 1.1.1.3,
-                 ghc-prim < 0.14,
                  attoparsec-internal
-  if impl(ghc < 7.4)
-    build-depends:
-      bytestring < 0.10.4.0
 
   if !impl(ghc >= 8.0)
     -- Data.Semigroup && Control.Monad.Fail are available in base-4.9+
@@ -195,7 +191,6 @@ benchmark attoparsec-benchmarks
     deepseq >= 1.1,
     directory,
     filepath,
-    ghc-prim,
     http-types,
     parsec >= 3.1.2,
     scientific,
diff --git a/benchmarks/Benchmarks.hs b/benchmarks/Benchmarks.hs
index da0f73f..70e4328 100644
--- a/benchmarks/Benchmarks.hs
+++ b/benchmarks/Benchmarks.hs
@@ -119,8 +119,3 @@ quotedString = AB.scan False $ \s c -> if s then Just False
                                        else if c == doubleQuote
                                             then Nothing
                                             else Just (c == backslash)
-
-#if !MIN_VERSION_base(4,5,0)
-unsafeShiftL :: Bits a => a -> Int -> a
-unsafeShiftL = shiftL
-#endif
diff --git a/benchmarks/warp-3.0.1.1/Network/Wai/Handler/Warp/ReadInt.hs b/benchmarks/warp-3.0.1.1/Network/Wai/Handler/Warp/ReadInt.hs
index 56b7dd7..c982e15 100644
--- a/benchmarks/warp-3.0.1.1/Network/Wai/Handler/Warp/ReadInt.hs
+++ b/benchmarks/warp-3.0.1.1/Network/Wai/Handler/Warp/ReadInt.hs
@@ -17,8 +17,7 @@ module Network.Wai.Handler.Warp.ReadInt (
 import Data.ByteString (ByteString)
 import qualified Data.ByteString as S
 import Data.Int (Int64)
-import GHC.Prim
-import GHC.Types
+import GHC.Exts
 import GHC.Word
 
 {-# INLINE readInt #-}