diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7f0db129..441dad44 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,8 @@
+## [3.18.1] - 2023-01-26
+### Fixed
+
+- Fix bug preventing access to authentication endpoint
+
 ## [3.18.0] - 2023-01-12
 ### Added
 
diff --git a/MangoPay/Libraries/RestTool.php b/MangoPay/Libraries/RestTool.php
index 93540457..529c019d 100644
--- a/MangoPay/Libraries/RestTool.php
+++ b/MangoPay/Libraries/RestTool.php
@@ -11,7 +11,7 @@
  */
 class RestTool
 {
-    const VERSION = '3.18.0';
+    const VERSION = '3.18.1';
 
     /**
      * Root/parent instance that holds the OAuthToken and Configuration instance