diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -1,3 +1,8 @@
+0.4.5 [2021.11.16]
+------------------
+* Drop support for pre-8.0 versions of GHC.
+* Allow building with `hashable-1.4.*`.
+
 0.4.4 [2021.02.17]
 ------------------
 * Allow building with `lens-5.*`.
diff --git a/hyperloglog.cabal b/hyperloglog.cabal
--- a/hyperloglog.cabal
+++ b/hyperloglog.cabal
@@ -1,6 +1,6 @@
 name:          hyperloglog
 category:      Numeric
-version:       0.4.4
+version:       0.4.5
 license:       BSD3
 cabal-version: >= 1.10
 license-file:  LICENSE
@@ -11,14 +11,14 @@
 bug-reports:   http://github.com/analytics/hyperloglog/issues
 copyright:     Copyright (C) 2013-2015 Edward A. Kmett
 build-type:    Simple
-tested-with:   GHC == 7.8.4
-             , GHC == 7.10.3
-             , GHC == 8.0.2
+tested-with:   GHC == 8.0.2
              , GHC == 8.2.2
              , GHC == 8.4.4
              , GHC == 8.6.5
-             , GHC == 8.8.3
-             , GHC == 8.10.1
+             , GHC == 8.8.4
+             , GHC == 8.10.7
+             , GHC == 9.0.1
+             , GHC == 9.2.1
 synopsis:      An approximate streaming (constant space) unique object counter
 description:
   This package provides an approximate streaming (constant space) unique object counter.
@@ -48,7 +48,7 @@
 library
   build-depends:
     approximate               >= 0.2.1    && < 1,
-    base                      >= 4.7      && < 5,
+    base                      >= 4.9      && < 5,
     binary                    >= 0.5      && < 0.9,
     bits                      >= 0.2      && < 1,
     bytes                     >= 0.7      && < 1,
@@ -57,7 +57,7 @@
     comonad                   >= 4        && < 6,
     deepseq                   >= 1.3      && < 1.5,
     distributive              >= 0.3      && < 1,
-    hashable                  >= 1.1.2.3  && < 1.4,
+    hashable                  >= 1.1.2.3  && < 1.5,
     lens                      >= 4        && < 6,
     reflection                >= 1.3      && < 3,
     semigroupoids             >= 4        && < 6,
@@ -71,14 +71,11 @@
     cpp-options: -DHERBIE
     ghc-options: -fplugin=Herbie
 
-  if impl(ghc < 7.6)
-    build-depends: ghc-prim
-
   exposed-modules:
     Data.HyperLogLog
     Data.HyperLogLog.Config
     Data.HyperLogLog.Type
 
-  ghc-options: -Wall -fwarn-tabs -O2
+  ghc-options: -Wall -Wtabs -O2
   hs-source-dirs: src
   default-language: Haskell2010
diff --git a/src/Data/HyperLogLog.hs b/src/Data/HyperLogLog.hs
--- a/src/Data/HyperLogLog.hs
+++ b/src/Data/HyperLogLog.hs
@@ -1,4 +1,3 @@
-{-# LANGUAGE CPP #-}
 --------------------------------------------------------------------
 -- |
 -- Copyright :  (c) Edward Kmett 2013-2015
@@ -20,9 +19,7 @@
   , insert
   , insertHash
   , cast
-#if __GLASGOW_HASKELL__ >= 708
   , coerceConfig
-#endif
   ) where
 
 import Data.HyperLogLog.Type
diff --git a/src/Data/HyperLogLog/Config.hs b/src/Data/HyperLogLog/Config.hs
--- a/src/Data/HyperLogLog/Config.hs
+++ b/src/Data/HyperLogLog/Config.hs
@@ -1,14 +1,10 @@
-{-# LANGUAGE CPP #-}
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE PolyKinds #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# OPTIONS_GHC -fno-cse #-}
 {-# OPTIONS_GHC -fno-full-laziness #-}
 {-# OPTIONS_GHC -fno-float-in #-}
-{-# OPTIONS_GHC -fno-warn-unused-binds #-}
-
-#if __GLASGOW_HASKELL__ >= 705
-{-# LANGUAGE DataKinds #-}
-{-# LANGUAGE PolyKinds #-}
-#endif
+{-# OPTIONS_GHC -Wno-unused-binds #-}
 
 --------------------------------------------------------------------
 -- |
@@ -40,9 +36,6 @@
 import Data.Bits.Extras
 import Data.Vector.Serialize ()
 import GHC.Int
-#if __GLASGOW_HASKELL__ < 710
-import GHC.Word
-#endif
 
 type Rank = Int8
 
diff --git a/src/Data/HyperLogLog/Type.hs b/src/Data/HyperLogLog/Type.hs
--- a/src/Data/HyperLogLog/Type.hs
+++ b/src/Data/HyperLogLog/Type.hs
@@ -6,22 +6,16 @@
 {-# LANGUAGE FunctionalDependencies    #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving#-}
 {-# LANGUAGE MultiParamTypeClasses     #-}
+{-# LANGUAGE PolyKinds                 #-}
 {-# LANGUAGE RankNTypes                #-}
+{-# LANGUAGE RoleAnnotations           #-}
 {-# LANGUAGE ScopedTypeVariables       #-}
 {-# LANGUAGE UndecidableInstances      #-}
 {-# LANGUAGE MonoLocalBinds            #-}
 {-# OPTIONS_GHC -fno-cse #-}
 {-# OPTIONS_GHC -fno-full-laziness #-}
 {-# OPTIONS_GHC -fno-float-in #-}
-{-# OPTIONS_GHC -fno-warn-unused-binds #-}
-
-#if __GLASGOW_HASKELL__ >= 706
-{-# LANGUAGE PolyKinds #-}
-#endif
-
-#if __GLASGOW_HASKELL__ >= 707
-{-# LANGUAGE RoleAnnotations #-}
-#endif
+{-# OPTIONS_GHC -Wno-unused-binds #-}
 
 --------------------------------------------------------------------
 -- |
@@ -47,9 +41,7 @@
   , insertHash
   , intersectionSize
   , cast
-#if __GLASGOW_HASKELL__ >= 708
   , coerceConfig
-#endif
   ) where
 
 import Control.DeepSeq (NFData (..))
@@ -66,21 +58,12 @@
 import Data.Proxy
 import Data.Reflection
 import Data.Serialize as Serialize
+import Data.Type.Coercion (Coercion(..))
 import qualified Data.Vector.Unboxed as V
 import qualified Data.Vector.Unboxed.Mutable as MV
 import GHC.Generics hiding (D, to)
 import GHC.Int
 
-#if MIN_VERSION_base(4,7,0)
-import Data.Type.Coercion (Coercion(..))
-#endif
-
-#if !(MIN_VERSION_base(4,8,0))
-import Control.Applicative
-import Data.Monoid (Monoid(..))
-import Data.Word
-#endif
-
 #if !(MIN_VERSION_base(4,11,0))
 import Data.Semigroup (Semigroup(..))
 #endif
@@ -118,19 +101,14 @@
 -- approximate counter.
 newtype HyperLogLog p = HyperLogLog { runHyperLogLog :: V.Vector Rank }
     deriving (Eq, Show, Generic, NFData)
+type role HyperLogLog nominal
 
-#if __GLASGOW_HASKELL__ >= 708
 -- | If two types @p@ and @q@ reify the same configuration, then we can coerce
 -- between @'HyperLogLog' p@ and @'HyperLogLog' q@. We do this by building
 -- a hole in the @nominal@ role for the configuration parameter.
 coerceConfig :: forall p q . (Reifies p Integer, Reifies q Integer) => Maybe (Coercion (HyperLogLog p) (HyperLogLog q))
 coerceConfig | reflect (Proxy :: Proxy p) == reflect (Proxy :: Proxy q) = Just Coercion
              | otherwise = Nothing
-#endif
-
-#if __GLASGOW_HASKELL__ >= 707
-type role HyperLogLog nominal
-#endif
 
 instance Serialize (HyperLogLog p)