diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 1.0.1.1
+
+  - Require `base >= 4.11` (GHC 8.4).
+
 # 1.0
 
   - Add Unix diff style annotations to output of `prettyContextDiff`,
diff --git a/Diff.cabal b/Diff.cabal
--- a/Diff.cabal
+++ b/Diff.cabal
@@ -1,6 +1,6 @@
 Cabal-Version:       1.18
 name:                Diff
-version:             1.0.1
+version:             1.0.1.1
 synopsis:            Diff algorithm in pure Haskell
 description:         Implementation of the standard diff algorithm in Haskell.
  .
@@ -12,16 +12,29 @@
 license-file:        LICENSE
 author:              Sterling Clover
 maintainer:          David Fox <dsf@seereason.com>
-Tested-With:         GHC == 7.10.3, GHC == 8.0.2, GHC == 8.2.2, GHC == 8.4.4, GHC == 8.6.5,
-                     GHC == 8.8.4, GHC == 8.10.7, GHC == 9.0.2, GHC == 9.2.8, GHC == 9.4.7,
-                     GHC == 9.6.3, GHC == 9.8.1
 Build-Type:          Simple
 
+tested-with:
+  GHC == 9.12.0
+  GHC == 9.10.1
+  GHC == 9.8.2
+  GHC == 9.6.6
+  GHC == 9.4.8
+  GHC == 9.2.8
+  GHC == 9.0.2
+  GHC == 8.10.7
+  GHC == 8.8.4
+  GHC == 8.6.5
+  GHC == 8.4.4
+
 extra-doc-files:     CHANGELOG.md
 
 library
   default-language: Haskell2010
-  build-depends:   base >= 4.8 && <= 6, array, pretty >= 1.1
+  build-depends:
+      base >= 4.11 && <= 6
+    , array
+    , pretty >= 1.1
   hs-source-dirs:  src
   exposed-modules:
                    Data.Algorithm.Diff,
@@ -31,20 +44,20 @@
 
 source-repository head
   type:      git
-  location:  http://github.com/seereason/Diff
+  location:  https://github.com/seereason/Diff
 
 test-suite diff-tests
   default-language: Haskell2010
   type: exitcode-stdio-1.0
-  hs-source-dirs: test, src
+  hs-source-dirs: test
   main-is: Test.hs
-  build-depends: base >= 3 && <= 6, array
-                , pretty, QuickCheck, test-framework
-                , test-framework-quickcheck2, process
-                , directory
-  if impl(ghc < 8.0)
-    build-depends: semigroups
-  other-modules:
-                   Data.Algorithm.Diff,
-                   Data.Algorithm.DiffOutput
-                   Data.Algorithm.DiffContext
+  build-depends:
+      Diff
+    , base >= 3 && <= 6
+    , array
+    , pretty
+    , directory
+    , process
+    , QuickCheck
+    , test-framework
+    , test-framework-quickcheck2