diff --git a/lib/PayPal/Core/PayPalConstants.php b/lib/PayPal/Core/PayPalConstants.php
index 7892881..9180748 100644
--- a/lib/PayPal/Core/PayPalConstants.php
+++ b/lib/PayPal/Core/PayPalConstants.php
@@ -12,7 +12,7 @@ class PayPalConstants
 {
 
     const SDK_NAME = 'PayPal-PHP-SDK';
-    const SDK_VERSION = '1.1.0';
+    const SDK_VERSION = '1.1.1';
 
     /**
      * Approval URL for Payment
diff --git a/release_notes.md b/release_notes.md
index b6aa83c..b50931c 100644
--- a/release_notes.md
+++ b/release_notes.md
@@ -1,5 +1,9 @@
 PayPal PHP SDK release notes
 ============================
+v1.1.1
+----
+* Fix to Cipher Encryption (Critical)
+
 v1.1.0
 ----
 * Enabled Payouts Cancel API Support for Unclaimed Payouts