diff --git a/ReadMe.md b/ReadMe.md
index c30c3bb22..10a6ffe2a 100644
--- a/ReadMe.md
+++ b/ReadMe.md
@@ -32,7 +32,7 @@ Coming from other custom firmware, you'll get:
   - *MIFARE Classic Accelerated dictionary attack*: dictionary attacks reduced to several seconds - checks ~3500 keys per second
   - *MIFARE Classic Nested attack support*: collects nested nonces to be cracked by MFKey
   - *MIFARE Classic Static encrypted backdoor support*: collects static encrypted nonces to be cracked by MFKey using NXP/Fudan backdoor
-- **MFKey 3.1**: Mfkey32, Static Nested, and Static Encrypted attacks all on your Flipper Zero
+- **MFKey 4.0**: Mfkey32, Static Nested, and Static Encrypted attacks all on your Flipper Zero
 - **MIFARE Ultralight C Dictionary attack**: Ultralight C key management and bruteforce attacks, feature parity with MIFARE Classic
 - **MIFARE Ultralight C Key recovery** (NXP disclosure in progress!)
 - **NFC app memory improvements** (coming soon!)