diff --git a/HISTORY.md b/HISTORY.md
index 12bd618..153a085 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,3 +1,6 @@
+## v4.1.3
+* PR 56: Fixed extra space in WebSocket `MessageType.Unsubscribe` type that caused unsubscription to fail.   
+
 ## v4.1.2
 * PR 36: Add `[JsonProperty("product_id")]` to `Models.AccountDetails.ProductId`.