diff --git a/app/App/Commands.hs b/app/App/Commands.hs
--- a/app/App/Commands.hs
+++ b/app/App/Commands.hs
@@ -4,7 +4,6 @@
 import App.Commands.SelectAll
 import App.Commands.UnitTest
 import App.Commands.Validate
-import Data.Monoid            ((<>))
 import Options.Applicative
 
 cmdOpts :: Parser (IO ())
diff --git a/app/App/Commands/Build.hs b/app/App/Commands/Build.hs
--- a/app/App/Commands/Build.hs
+++ b/app/App/Commands/Build.hs
@@ -10,7 +10,6 @@
 import Control.Monad
 import Data.Generics.Product.Any
 import Data.List
-import Data.Monoid                         ((<>))
 import HaskellWorks.Data.FromForeignRegion
 import Options.Applicative
 import System.Directory
diff --git a/app/App/Commands/SelectAll.hs b/app/App/Commands/SelectAll.hs
--- a/app/App/Commands/SelectAll.hs
+++ b/app/App/Commands/SelectAll.hs
@@ -11,7 +11,6 @@
 import Control.Monad
 import Data.Generics.Product.Any
 import Data.List
-import Data.Monoid                               ((<>))
 import HaskellWorks.Data.Bits.PopCount.PopCount1
 import HaskellWorks.Data.FromForeignRegion
 import HaskellWorks.Data.RankSelect.Base.Select1
diff --git a/app/App/Commands/UnitTest.hs b/app/App/Commands/UnitTest.hs
--- a/app/App/Commands/UnitTest.hs
+++ b/app/App/Commands/UnitTest.hs
@@ -10,7 +10,6 @@
 import Control.Lens
 import Control.Monad
 import Data.Generics.Product.Any
-import Data.Monoid                               ((<>))
 import Data.Word
 import HaskellWorks.Data.Bits.PopCount.PopCount1
 import HaskellWorks.Data.RankSelect.Base.Select1
diff --git a/app/App/Commands/Validate.hs b/app/App/Commands/Validate.hs
--- a/app/App/Commands/Validate.hs
+++ b/app/App/Commands/Validate.hs
@@ -11,7 +11,6 @@
 import Control.Monad
 import Control.Monad.State
 import Data.Generics.Product.Any
-import Data.Monoid                               ((<>))
 import Data.Word
 import HaskellWorks.Data.AtIndex
 import HaskellWorks.Data.Bits.PopCount.PopCount1
diff --git a/app/Main.hs b/app/Main.hs
--- a/app/Main.hs
+++ b/app/Main.hs
@@ -6,7 +6,6 @@
 import App.Commands
 import Control.Monad
 import Data.List
-import Data.Monoid                               ((<>))
 import HaskellWorks.Data.Bits.PopCount.PopCount1
 import HaskellWorks.Data.FromForeignRegion
 import HaskellWorks.Data.RankSelect.Base.Select1
diff --git a/bench/Main.hs b/bench/Main.hs
--- a/bench/Main.hs
+++ b/bench/Main.hs
@@ -6,7 +6,6 @@
 import Control.Monad
 import Criterion.Main
 import Data.List
-import Data.Monoid                                                 ((<>))
 import Data.Word
 import HaskellWorks.Data.Bits.PopCount.PopCount1
 import HaskellWorks.Data.FromForeignRegion
diff --git a/hw-rankselect.cabal b/hw-rankselect.cabal
--- a/hw-rankselect.cabal
+++ b/hw-rankselect.cabal
@@ -1,7 +1,7 @@
 cabal-version:  2.2
 
 name:                   hw-rankselect
-version:                0.13.3.2
+version:                0.13.4.0
 synopsis:               Rank-select
 description:            Please see README.md
 category:               Data, Bit, Succinct Data Structures, Data Structures
@@ -9,10 +9,10 @@
 bug-reports:            https://github.com/haskell-works/hw-rankselect/issues
 author:                 John Ky
 maintainer:             newhoggy@gmail.com
-copyright:              2016-2019 John Ky
+copyright:              2016-2020 John Ky
 license:                BSD-3-Clause
 license-file:           LICENSE
-tested-with:            GHC == 8.8.1, GHC == 8.6.5, GHC == 8.4.4, GHC == 8.2.2
+tested-with:            GHC == 8.10.1, GHC == 8.8.3, GHC == 8.6.5, GHC == 8.4.4
 build-type:             Simple
 extra-source-files:     README.md
                         data/README.md
@@ -27,33 +27,33 @@
   manual: False
   default: False
 
-common base                 { build-depends: base                 >= 4.10       && < 5      }
+common base                       { build-depends: base                       >= 4.11       && < 5      }
 
-common QuickCheck           { build-depends: QuickCheck           >= 2.10       && < 2.14   }
-common bytestring           { build-depends: bytestring           >= 0.10       && < 0.11   }
-common conduit              { build-depends: conduit              >= 1.2        && < 1.4    }
-common criterion            { build-depends: criterion            >= 1.1        && < 1.6    }
-common deepseq              { build-depends: deepseq              >= 1.4        && < 1.5    }
-common directory            { build-depends: directory            >= 1.2        && < 1.5    }
-common doctest              { build-depends: doctest              >= 0.16.2     && < 0.17   }
-common doctest-discover     { build-depends: doctest-discover     >= 0.2        && < 0.3    }
-common generic-lens         { build-depends: generic-lens         >= 1.2.0.1    && < 1.3    }
-common hedgehog             { build-depends: hedgehog             >= 1.0        && < 1.1    }
-common hspec                { build-depends: hspec                >= 2.4        && < 3      }
-common hw-balancedparens    { build-depends: hw-balancedparens    >= 0.2.2.0    && < 0.4    }
-common hw-bits              { build-depends: hw-bits              >= 0.4.0.0    && < 0.8    }
-common hw-fingertree        { build-depends: hw-fingertree        >= 0.1.1.0    && < 1.2    }
-common hw-hedgehog          { build-depends: hw-hedgehog          >= 0.1.0.1    && < 0.2    }
-common hw-hspec-hedgehog    { build-depends: hw-hspec-hedgehog    >= 0.1        && < 0.2    }
-common hw-prim              { build-depends: hw-prim              >= 0.6.2.23   && < 0.7    }
-common hw-rankselect-base   { build-depends: hw-rankselect-base   >= 0.2.0.0    && < 0.4    }
-common lens                 { build-depends: lens                 >= 4          && < 5      }
-common mmap                 { build-depends: mmap                 >= 0.5        && < 0.6    }
-common mtl                  { build-depends: mtl                  >= 2.2        && < 2.3    }
-common optparse-applicative { build-depends: optparse-applicative >= 0.11       && < 0.16   }
-common resourcet            { build-depends: resourcet            >= 1.1        && < 1.3    }
-common transformers         { build-depends: transformers         >= 0.4        && < 0.6    }
-common vector               { build-depends: vector               >= 0.12       && < 0.13   }
+common QuickCheck                 { build-depends: QuickCheck                 >= 2.10       && < 2.15   }
+common bytestring                 { build-depends: bytestring                 >= 0.10       && < 0.11   }
+common conduit                    { build-depends: conduit                    >= 1.2        && < 1.4    }
+common criterion                  { build-depends: criterion                  >= 1.1        && < 1.6    }
+common deepseq                    { build-depends: deepseq                    >= 1.4        && < 1.5    }
+common directory                  { build-depends: directory                  >= 1.2        && < 1.5    }
+common doctest                    { build-depends: doctest                    >= 0.16.2     && < 0.17   }
+common doctest-discover           { build-depends: doctest-discover           >= 0.2        && < 0.3    }
+common generic-lens               { build-depends: generic-lens               >= 1.2.0.1    && < 2.1    }
+common hedgehog                   { build-depends: hedgehog                   >= 1.0        && < 1.1    }
+common hspec                      { build-depends: hspec                      >= 2.4        && < 3      }
+common hw-balancedparens          { build-depends: hw-balancedparens          >= 0.2.2.0    && < 0.4    }
+common hw-bits                    { build-depends: hw-bits                    >= 0.4.0.0    && < 0.8    }
+common hw-fingertree              { build-depends: hw-fingertree              >= 0.1.1.0    && < 1.2    }
+common hw-hedgehog                { build-depends: hw-hedgehog                >= 0.1.0.1    && < 0.2    }
+common hw-hspec-hedgehog          { build-depends: hw-hspec-hedgehog          >= 0.1        && < 0.2    }
+common hw-prim                    { build-depends: hw-prim                    >= 0.6.2.23   && < 0.7    }
+common hw-rankselect-base         { build-depends: hw-rankselect-base         >= 0.2.0.0    && < 0.4    }
+common lens                       { build-depends: lens                       >= 4          && < 5      }
+common mmap                       { build-depends: mmap                       >= 0.5        && < 0.6    }
+common mtl                        { build-depends: mtl                        >= 2.2        && < 2.3    }
+common optparse-applicative       { build-depends: optparse-applicative       >= 0.11       && < 0.16   }
+common resourcet                  { build-depends: resourcet                  >= 1.1        && < 1.3    }
+common transformers               { build-depends: transformers               >= 0.4        && < 0.6    }
+common vector                     { build-depends: vector                     >= 0.12       && < 0.13   }
 
 common config
   default-language: Haskell2010
diff --git a/src/HaskellWorks/Data/RankSelect/BitSeq.hs b/src/HaskellWorks/Data/RankSelect/BitSeq.hs
--- a/src/HaskellWorks/Data/RankSelect/BitSeq.hs
+++ b/src/HaskellWorks/Data/RankSelect/BitSeq.hs
@@ -20,7 +20,6 @@
 
 import Data.Coerce
 import Data.Foldable
-import Data.Monoid
 import Data.Word
 import HaskellWorks.Data.Bits.BitWise
 import HaskellWorks.Data.FingerTree                 (ViewL (..), ViewR (..), (<|), (><), (|>))
diff --git a/src/HaskellWorks/Data/RankSelect/CsPoppy/Internal/Nice.hs b/src/HaskellWorks/Data/RankSelect/CsPoppy/Internal/Nice.hs
--- a/src/HaskellWorks/Data/RankSelect/CsPoppy/Internal/Nice.hs
+++ b/src/HaskellWorks/Data/RankSelect/CsPoppy/Internal/Nice.hs
@@ -2,7 +2,6 @@
 
 module HaskellWorks.Data.RankSelect.CsPoppy.Internal.Nice where
 
-import Data.Semigroup                                              ((<>))
 import HaskellWorks.Data.Bits.BitShow
 import HaskellWorks.Data.RankSelect.CsPoppy
 import HaskellWorks.Data.RankSelect.CsPoppy.Internal.CsInterleaved
diff --git a/src/HaskellWorks/Data/RankSelect/Internal/BitSeq.hs b/src/HaskellWorks/Data/RankSelect/Internal/BitSeq.hs
--- a/src/HaskellWorks/Data/RankSelect/Internal/BitSeq.hs
+++ b/src/HaskellWorks/Data/RankSelect/Internal/BitSeq.hs
@@ -20,8 +20,6 @@
   ) where
 
 import Control.DeepSeq
-import Data.Monoid                               (Monoid)
-import Data.Semigroup                            (Semigroup (..))
 import Data.Word
 import GHC.Generics
 import HaskellWorks.Data.Bits.BitWise
diff --git a/test/HaskellWorks/Data/RankSelect/BitSeqSpec.hs b/test/HaskellWorks/Data/RankSelect/BitSeqSpec.hs
--- a/test/HaskellWorks/Data/RankSelect/BitSeqSpec.hs
+++ b/test/HaskellWorks/Data/RankSelect/BitSeqSpec.hs
@@ -4,7 +4,6 @@
 
 module HaskellWorks.Data.RankSelect.BitSeqSpec where
 
-import Data.Semigroup                            ((<>))
 import HaskellWorks.Data.Bits.PopCount.PopCount1
 import HaskellWorks.Data.RankSelect.Base.Rank1
 import HaskellWorks.Data.RankSelect.Base.Select1
diff --git a/test/HaskellWorks/Data/RankSelect/CsPoppySpec.hs b/test/HaskellWorks/Data/RankSelect/CsPoppySpec.hs
--- a/test/HaskellWorks/Data/RankSelect/CsPoppySpec.hs
+++ b/test/HaskellWorks/Data/RankSelect/CsPoppySpec.hs
@@ -10,7 +10,6 @@
 import Control.Monad.IO.Class
 import Data.Function
 import Data.Maybe
-import Data.Monoid                                        ((<>))
 import Data.Word
 import GHC.Exts
 import HaskellWorks.Data.AtIndex
diff --git a/test/HaskellWorks/Data/RankSelect/ValidateSpec.hs b/test/HaskellWorks/Data/RankSelect/ValidateSpec.hs
--- a/test/HaskellWorks/Data/RankSelect/ValidateSpec.hs
+++ b/test/HaskellWorks/Data/RankSelect/ValidateSpec.hs
@@ -6,7 +6,6 @@
 import Control.Monad
 import Control.Monad.IO.Class
 import Data.List                                 (isSuffixOf)
-import Data.Monoid                               ((<>))
 import Data.Word
 import HaskellWorks.Data.AtIndex
 import HaskellWorks.Data.Bits.PopCount.PopCount1
