diff --git a/lib/core/option.py b/lib/core/option.py
index a8939cca7..8bb35e36e 100644
--- a/lib/core/option.py
+++ b/lib/core/option.py
@@ -812,7 +812,7 @@ def _setTamperingFunctions():
             priority = PRIORITY.NORMAL if not hasattr(module, "__priority__") else module.__priority__
 
             for name, function in inspect.getmembers(module, inspect.isfunction):
-                if name == "tamper" and inspect.getargspec(function).args and inspect.getargspec(function).keywords == "kwargs":
+                if name == "tamper" and (hasattr(inspect, "signature") and all(_ in inspect.signature(function).parameters for _ in ("payload", "kwargs")) or hasattr(inspect, "getargspec") and inspect.getargspec(function).args and inspect.getargspec(function).keywords == "kwargs"):
                     found = True
                     kb.tamperFunctions.append(function)
                     function.__name__ = module.__name__
diff --git a/lib/core/settings.py b/lib/core/settings.py
index ad618b3ad..14c6e1275 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -20,7 +20,7 @@ from thirdparty import six
 from thirdparty.six import unichr as _unichr
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.5.12.2"
+VERSION = "1.5.12.3"
 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)