diff --git a/lib/core/settings.py b/lib/core/settings.py
index ba5572fda..4cf729672 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 = "1.4.8.1"
+VERSION = "1.4.8.2"
 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/dunion.py b/tamper/dunion.py
index 9d32b6647..70ebd002c 100644
--- a/tamper/dunion.py
+++ b/tamper/dunion.py
@@ -5,14 +5,17 @@ Copyright (c) 2006-2020 sqlmap developers (http://sqlmap.org/)
 See the file 'LICENSE' for copying permission
 """
 
+import os
 import re
 
+from lib.core.common import singleTimeWarnMessage
+from lib.core.enums import DBMS
 from lib.core.enums import PRIORITY
 
 __priority__ = PRIORITY.HIGHEST
 
 def dependencies():
-    pass
+    singleTimeWarnMessage("tamper script '%s' is only meant to be run against %s" % (os.path.basename(__file__).split(".")[0], DBMS.ORACLE))
 
 def tamper(payload, **kwargs):
     """
diff --git a/tamper/equaltolike.py b/tamper/equaltolike.py
index 14328b5d6..2baa76792 100644
--- a/tamper/equaltolike.py
+++ b/tamper/equaltolike.py
@@ -5,11 +5,8 @@ Copyright (c) 2006-2020 sqlmap developers (http://sqlmap.org/)
 See the file 'LICENSE' for copying permission
 """
 
-import os
 import re
 
-from lib.core.common import singleTimeWarnMessage
-from lib.core.enums import DBMS
 from lib.core.enums import PRIORITY
 
 __priority__ = PRIORITY.HIGHEST
diff --git a/tamper/hex2char.py b/tamper/hex2char.py
index bdfa32feb..5df432650 100644
--- a/tamper/hex2char.py
+++ b/tamper/hex2char.py
@@ -7,14 +7,16 @@ See the file 'LICENSE' for copying permission
 
 import re
 
+from lib.core.common import singleTimeWarnMessage
 from lib.core.convert import decodeHex
 from lib.core.convert import getOrds
+from lib.core.enums import DBMS
 from lib.core.enums import PRIORITY
 
 __priority__ = PRIORITY.NORMAL
 
 def dependencies():
-    pass
+    singleTimeWarnMessage("tamper script '%s' is only meant to be run against %s" % (os.path.basename(__file__).split(".")[0], DBMS.MYSQL))
 
 def tamper(payload, **kwargs):
     """
diff --git a/tamper/misunion.py b/tamper/misunion.py
index bb8d3be09..baf767abb 100644
--- a/tamper/misunion.py
+++ b/tamper/misunion.py
@@ -5,14 +5,17 @@ Copyright (c) 2006-2020 sqlmap developers (http://sqlmap.org/)
 See the file 'LICENSE' for copying permission
 """
 
+import os
 import re
 
+from lib.core.common import singleTimeWarnMessage
+from lib.core.enums import DBMS
 from lib.core.enums import PRIORITY
 
 __priority__ = PRIORITY.HIGHEST
 
 def dependencies():
-    pass
+    singleTimeWarnMessage("tamper script '%s' is only meant to be run against %s" % (os.path.basename(__file__).split(".")[0], DBMS.MYSQL))
 
 def tamper(payload, **kwargs):
     """