diff --git a/CHANGELOG.md b/CHANGELOG.md
index 017b63e48..1144383b5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,9 @@
 Changelog
 ------------
 
+##### 8.6.1
+Updated `CellSizeCache` interface for the better perfomance by removing `has` methods, reducing a double hashtable lookup to a single lookup. Special thanks to @arusakov for this contribution!
+
 ##### 8.6.0
 `CellMeasurer` passes `index` param (duplicate of `rowIndex`) in order to more easily integrate with `List` by default.
 
diff --git a/package.json b/package.json
index e1efff0f6..55978fb4a 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "description": "React components for efficiently rendering large, scrollable lists and tabular data",
   "author": "Brian Vaughn <brian.david.vaughn@gmail.com>",
   "user": "bvaughn",
-  "version": "8.6.0",
+  "version": "8.6.1",
   "homepage": "https://github.com/bvaughn/react-virtualized",
   "main": "dist/commonjs/index.js",
   "module": "dist/es/index.js",