diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 0c6e0c1d..18d24c2f 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All changes to this project will be documented in this file.
 
+## [11.2.6] - 2021-05-18
+
+(Windows) move EINVAL (re)definition from IXSocket.h to IXNetSystem.h (fix #289)
+
 ## [11.2.5] - 2021-04-04
 
 (http client) DEL is not an HTTP method name, but DELETE is
diff --git a/ixwebsocket/IXWebSocketVersion.h b/ixwebsocket/IXWebSocketVersion.h
index befa5098..e6e2b37c 100644
--- a/ixwebsocket/IXWebSocketVersion.h
+++ b/ixwebsocket/IXWebSocketVersion.h
@@ -6,4 +6,4 @@
 
 #pragma once
 
-#define IX_WEBSOCKET_VERSION "11.2.5"
+#define IX_WEBSOCKET_VERSION "11.2.6"