diff --git a/lib/core/settings.py b/lib/core/settings.py
index 6186f35fc..c1e89a116 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -18,7 +18,7 @@ from lib.core.enums import OS
 from thirdparty.six import unichr as _unichr
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.4.9.14"
+VERSION = "1.4.9.15"
 TYPE = "dev" if VERSION.count('.') > 2 and VERSION.split('.')[-1] != '0' else "stable"
 TYPE_COLORS = {"dev": 33, "stable": 90, "pip": 34}
 VERSION_STRING = "sqlmap/%s#%s" % ('.'.join(VERSION.split('.')[:-1]) if VERSION.count('.') > 2 and VERSION.split('.')[-1] == '0' else VERSION, TYPE)
diff --git a/tamper/sleep2getlock.py b/tamper/sleep2getlock.py
index 6a8323797..204c36b7c 100644
--- a/tamper/sleep2getlock.py
+++ b/tamper/sleep2getlock.py
@@ -5,7 +5,6 @@ Copyright (c) 2006-2020 sqlmap developers (http://sqlmap.org/)
 See the file 'LICENSE' for copying permission
 """
 
-from lib.core.compat import xrange
 from lib.core.data import kb
 from lib.core.enums import PRIORITY
 
@@ -16,7 +15,7 @@ def dependencies():
 
 def tamper(payload, **kwargs):
     """
-    Replaces instances like 'SLEEP(5)' with (e.g.) "get_lock('ETgP',5)"
+    Replaces instances like 'SLEEP(5)' with (e.g.) "GET_LOCK('ETgP',5)"
 
     Requirement:
         * MySQL
@@ -30,11 +29,11 @@ def tamper(payload, **kwargs):
 
         * Reference: https://zhuanlan.zhihu.com/p/35245598
 
-    >>> tamper('SLEEP(5)') == "get_lock('%s',5)" % kb.aliasName
+    >>> tamper('SLEEP(5)') == "GET_LOCK('%s',5)" % kb.aliasName
     True
     """
 
     if payload:
-        payload = payload.replace("SLEEP(", "get_lock('%s'," % kb.aliasName)
+        payload = payload.replace("SLEEP(", "GET_LOCK('%s'," % kb.aliasName)
 
     return payload