diff --git a/tgbotapi.core/README.md b/tgbotapi.core/README.md
index 0b8ed3f0d4..344aeace98 100644
--- a/tgbotapi.core/README.md
+++ b/tgbotapi.core/README.md
@@ -10,7 +10,7 @@ moments are describing by official [Telegram Bot API](https://core.telegram.org/
 
 ## Compatibility
 
-This version compatible with [4th of November 2020 update of TelegramBotAPI (version 5.0)](https://core.telegram.org/bots/api#november-4-2020).
+This version compatible with [9th of March 2021 update of TelegramBotAPI (version 5.1)](https://core.telegram.org/bots/api#march-9-2021).
 
 ## How to implement library?