diff --git a/CHANGELOG.md b/CHANGELOG.md
index 64cddf9..72006fd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+# 2.0.0
+
+  - Remove `groupBy'` from `Data.Algorithm.DiffContext` exports (#26).
+    Use `Data.List.GroupBy.groupBy` from `groupBy` package instead.
+  - Optimize `Data.Algorithm.Diff` functions (#25, #30, #37).
+    ~2.4x and ~8.5x `getDiff` improvement on benchmarks.
+
 # 1.0.2
 
   - Output correct format when an input file is empty, e.g. `@@ --0,0 +1,3 @@`.
diff --git a/Diff-liquidhaskell/Diff-liquidhaskell.cabal b/Diff-liquidhaskell/Diff-liquidhaskell.cabal
index 5a9d3c4..fc46f7e 100644
--- a/Diff-liquidhaskell/Diff-liquidhaskell.cabal
+++ b/Diff-liquidhaskell/Diff-liquidhaskell.cabal
@@ -1,4 +1,4 @@
-cabal-version: 2.4
+cabal-version: 1.18
 name:          Diff-liquidhaskell
 version:       0.1.0.0
 synopsis:      LiquidHaskell static checks for the Diff package
@@ -30,7 +30,7 @@ library
       -- LH version scheme: 0.<GHC_VERSION>.<LH_REVISION>
       -- Update the corresponding versions in .github/workflows/liquidhaskell.yml
       -- after upgrading GHC and LH to keep CI in sync.
-    , liquidhaskell ^>= 0.9.14.1.1
+    , liquidhaskell ==0.9.14.1.1
   -- Recompilation check is disabled to make sure changes to specification
   -- annotations are checked by the LH plugin (otherwise they are silently ignored
   -- if no source change is introduced).
diff --git a/Diff.cabal b/Diff.cabal
index ed736a1..2caa97c 100644
--- a/Diff.cabal
+++ b/Diff.cabal
@@ -1,20 +1,20 @@
-Cabal-Version:       3.14
+Cabal-Version:       1.18
 name:                Diff
-version:             1.0.2
+version:             2.0.1
 synopsis:            Diff algorithm in pure Haskell
 description:         Implementation of the standard diff algorithm in Haskell.
  .
  Time complexity is O(ND) (input length * number of differences).
  Space complexity is O(D^2).  Includes utilities for pretty printing.
 category:            Algorithms
-homepage:            https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.4.6927
-license:             BSD-3-Clause
+homepage:            https://web.archive.org/web/20150326181224/http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.4.6927
+license:             BSD3
 license-file:        LICENSE
 author:              Sterling Clover
 maintainer:          David Fox <dsf@seereason.com>
 build-Type:          Simple
 extra-doc-files:     README.md, CHANGELOG.md
-extra-files:         ./Diff-liquidhaskell/Diff-liquidhaskell.cabal
+extra-source-files:  ./Diff-liquidhaskell/Diff-liquidhaskell.cabal
 bug-reports:         https://github.com/seereason/Diff/issues
 
 tested-with:
diff --git a/myers-1986.pdf b/myers-1986.pdf
new file mode 100644
index 0000000..439cae8
Binary files /dev/null and b/myers-1986.pdf differ