diff --git a/lib/core/settings.py b/lib/core/settings.py
index 3d422ef85..6f35827f9 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -19,7 +19,7 @@ from lib.core.enums import OS
 from thirdparty.six import unichr as _unichr
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.5.4.9"
+VERSION = "1.5.5.0"
 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/thirdparty/keepalive/keepalive.py b/thirdparty/keepalive/keepalive.py
index 4647f1f7c..59cd9aacc 100644
--- a/thirdparty/keepalive/keepalive.py
+++ b/thirdparty/keepalive/keepalive.py
@@ -165,11 +165,11 @@ class ConnectionManager:
 
     def get_ready_conn(self, host):
         conn = None
-        self._lock.acquire()
         try:
+            self._lock.acquire()
             if host in self._hostmap:
                 for c in self._hostmap[host]:
-                    if self._readymap[c]:
+                    if self._readymap.get(c):
                         self._readymap[c] = 0
                         conn = c
                         break