diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,7 @@
+# 0.1.1.0 (2021-09-10)
+
+- Add `alter` function to public interface ([#9](https://github.com/klapaucius/vector-hashtables/pull/9)).
+
 # 0.1.0.1 (2021-09-10)
 
 - Remove outdated executable in favor of benchmark.
diff --git a/src/Data/Vector/Hashtables.hs b/src/Data/Vector/Hashtables.hs
--- a/src/Data/Vector/Hashtables.hs
+++ b/src/Data/Vector/Hashtables.hs
@@ -31,6 +31,7 @@
     , lookup'
     , insert
     , delete
+    , alter
     , alterM
 
     -- ** Combine
diff --git a/vector-hashtables.cabal b/vector-hashtables.cabal
--- a/vector-hashtables.cabal
+++ b/vector-hashtables.cabal
@@ -1,5 +1,5 @@
 name:                vector-hashtables
-version:             0.1.0.1
+version:             0.1.1.0
 synopsis:            Efficient vector-based mutable hashtables implementation.
 description:
   This package provides efficient vector-based hashtable implementation similar to .NET Generic Dictionary implementation (at the time of 2015).