diff --git a/BaseTools/Source/Python/GenFds/CapsuleData.py b/BaseTools/Source/Python/GenFds/CapsuleData.py
index 651a16ec75..5f93734935 100644
--- a/BaseTools/Source/Python/GenFds/CapsuleData.py
+++ b/BaseTools/Source/Python/GenFds/CapsuleData.py
@@ -229,7 +229,7 @@ class CapsulePayload(CapsuleData):
                        )
         if AuthData:
             Buffer += pack('QIHH', AuthData[0], AuthData[1], AuthData[2], AuthData[3])
-            Buffer += uuid.UUID(AuthData[4]).get_bytes_le()
+            Buffer += uuid.UUID(AuthData[4]).bytes_le
 
         #
         # Append file content to the structure
diff --git a/BaseTools/Source/Python/Rsa2048Sha256Sign/Rsa2048Sha256Sign.py b/BaseTools/Source/Python/Rsa2048Sha256Sign/Rsa2048Sha256Sign.py
index 6cb235ae75..2f901a7f29 100644
--- a/BaseTools/Source/Python/Rsa2048Sha256Sign/Rsa2048Sha256Sign.py
+++ b/BaseTools/Source/Python/Rsa2048Sha256Sign/Rsa2048Sha256Sign.py
@@ -187,7 +187,7 @@ if __name__ == '__main__':
     # Write output file that contains hash GUID, Public Key, Signature, and Input data
     #
     args.OutputFile = open(args.OutputFileName, 'wb')
-    args.OutputFile.write(EFI_HASH_ALGORITHM_SHA256_GUID.get_bytes_le())
+    args.OutputFile.write(EFI_HASH_ALGORITHM_SHA256_GUID.bytes_le)
     args.OutputFile.write(bytearray.fromhex(PublicKey))
     args.OutputFile.write(Signature)
     args.OutputFile.write(args.InputFileBuffer)