diff --git a/VERSION b/VERSION
index fcdb2e10..1454f6ed 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.0.0
+4.0.1
diff --git a/src/Zendesk/API/HttpClient.php b/src/Zendesk/API/HttpClient.php
index dc1156be..51358196 100644
--- a/src/Zendesk/API/HttpClient.php
+++ b/src/Zendesk/API/HttpClient.php
@@ -114,7 +114,7 @@
  */
 class HttpClient
 {
-    const VERSION = '4.0.0';
+    const VERSION = '4.0.1';
 
     use InstantiatorTrait;