diff --git a/CHANGELOG.md b/CHANGELOG.md
index 683c55946..464cf1c50 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Change Log
 
-## 6.5.5 - UNRELEASED
+## 6.5.5 - 2020-06-16
 
 * Unpin version constraint for `symfony/polyfill-intl-idn` [#2678](https://github.com/guzzle/guzzle/pull/2678)
 
diff --git a/src/ClientInterface.php b/src/ClientInterface.php
index 54c759b96..638b75dca 100644
--- a/src/ClientInterface.php
+++ b/src/ClientInterface.php
@@ -15,7 +15,7 @@ interface ClientInterface
     /**
      * @deprecated Will be removed in Guzzle 7.0.0
      */
-    const VERSION = '6.5.4';
+    const VERSION = '6.5.5';
 
     /**
      * Send an HTTP request.