diff --git a/hw-fingertree.cabal b/hw-fingertree.cabal
--- a/hw-fingertree.cabal
+++ b/hw-fingertree.cabal
@@ -1,72 +1,73 @@
 cabal-version:  2.2
 
-name:           hw-fingertree
-version:        0.1.1.0
-synopsis:       Generic finger-tree structure, with example instances
-description:    A general sequence representation with arbitrary
-                annotations, for use as a base for implementations of
-                various collection types, with examples, as described
-                in section 4 of
-                .
-                * Ralf Hinze and Ross Paterson,
-                \"Finger trees: a simple general-purpose data structure\",
-                /Journal of Functional Programming/ 16:2 (2006) pp 197-217.
-                <http://staff.city.ac.uk/~ross/papers/FingerTree.html>
-                .
-                For a tuned sequence type, see @Data.Sequence@ in the
-                @containers@ package, which is a specialization of
-                this structure.
-category:       Data Structures
-homepage:       https://github.com/haskell-works/hw-fingertree#readme
-bug-reports:    https://github.com/haskell-works/hw-fingertree/issues
-maintainer:     John Ky <newhoggy@gmail.com>
-copyright:      (c) 2017-2019 John Ky
-                (c) 2006 Ross Paterson, Ralf Hinze,
-license:        BSD-3-Clause
-license-file:   LICENSE
-build-type:     Simple
+name:                   hw-fingertree
+version:                0.1.1.1
+synopsis:               Generic finger-tree structure, with example instances
+description:            A general sequence representation with arbitrary
+                        annotations, for use as a base for implementations of
+                        various collection types, with examples, as described
+                        in section 4 of
+                        .
+                        * Ralf Hinze and Ross Paterson,
+                        \"Finger trees: a simple general-purpose data structure\",
+                        /Journal of Functional Programming/ 16:2 (2006) pp 197-217.
+                        <http://staff.city.ac.uk/~ross/papers/FingerTree.html>
+                        .
+                        For a tuned sequence type, see @Data.Sequence@ in the
+                        @containers@ package, which is a specialization of
+                        this structure.
+category:               Data Structures
+homepage:               https://github.com/haskell-works/hw-fingertree#readme
+bug-reports:            https://github.com/haskell-works/hw-fingertree/issues
+maintainer:             John Ky <newhoggy@gmail.com>
+copyright:              (c) 2017-2019 John Ky
+                        (c) 2006 Ross Paterson, Ralf Hinze,
+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
+build-type:             Simple
 
+source-repository head
+  type: git
+  location: https://github.com/haskell-works/hw-fingertree
+
 common base                       { build-depends: base                       >= 4          && < 5      }
 
-common deepseq                    { build-depends: deepseq                                              }
-common hedgehog                   { build-depends: hedgehog                                             }
-common hspec                      { build-depends: hspec                                                }
-common hw-fingertree              { build-depends: hw-fingertree                                        }
-common hw-hspec-hedgehog          { build-depends: hw-hspec-hedgehog                                    }
+common deepseq                    { build-depends: deepseq                    >= 1.4        && < 1.5    }
+common hedgehog                   { build-depends: hedgehog                   >= 0.6        && < 1.1    }
+common hspec                      { build-depends: hspec                      >= 2.4        && < 3.0    }
+common hw-hspec-hedgehog          { build-depends: hw-hspec-hedgehog          >= 0.1        && < 0.2    }
 common hw-prim                    { build-depends: hw-prim                    >= 0.6.2.25   && < 0.7    }
 
 common config
   default-language: Haskell2010
 
-source-repository head
-  type: git
-  location: https://github.com/haskell-works/hw-fingertree
+common hw-fingertree
+  build-depends: hw-fingertree
 
 library
-  import:   base, config
-          , deepseq
-          , hw-prim
-  hs-source-dirs:     src
-  other-modules:      Paths_hw_fingertree
-  autogen-modules:    Paths_hw_fingertree
-  exposed-modules:
-    HaskellWorks.Data.FingerTree
-    HaskellWorks.Data.IntervalMap.FingerTree
-    HaskellWorks.Data.PriorityQueue.FingerTree
+  import:               base, config
+                      , deepseq
+                      , hw-prim
+  hs-source-dirs:       src
+  other-modules:        Paths_hw_fingertree
+  autogen-modules:      Paths_hw_fingertree
+  exposed-modules:      HaskellWorks.Data.FingerTree
+                        HaskellWorks.Data.IntervalMap.FingerTree
+                        HaskellWorks.Data.PriorityQueue.FingerTree
 
 test-suite hw-fingertree-tests
-  import:   base, config
-          , deepseq
-          , hedgehog
-          , hspec
-          , hw-hspec-hedgehog
-  build-depends:      hw-fingertree
-  type:               exitcode-stdio-1.0
-  main-is:            Spec.hs
-  hs-source-dirs:     tests
-  build-tools:        hspec-discover
-  autogen-modules:    Paths_hw_fingertree
-  other-modules:
-    HaskellWorks.Data.FingerTree.Gen
-    HaskellWorks.Data.FingerTreeSpec
-    Paths_hw_fingertree
+  import:               base, config
+                      , deepseq
+                      , hedgehog
+                      , hspec
+                      , hw-hspec-hedgehog
+  build-depends:        hw-fingertree
+  type:                 exitcode-stdio-1.0
+  main-is:              Spec.hs
+  hs-source-dirs:       tests
+  build-tool-depends:   hspec-discover:hspec-discover
+  autogen-modules:      Paths_hw_fingertree
+  other-modules:        HaskellWorks.Data.FingerTree.Gen
+                        HaskellWorks.Data.FingerTreeSpec
+                        Paths_hw_fingertree