diff --git a/data/txt/sha256sums.txt b/data/txt/sha256sums.txt
index 2ba72ee75..d562ac1c9 100644
--- a/data/txt/sha256sums.txt
+++ b/data/txt/sha256sums.txt
@@ -165,7 +165,7 @@ f9c96cd3fe99578bed9d49a8bdf8d76836d320a7c48c56eb0469f48b36775c35  lib/controller
 99d0e94dd5fe60137abf48bfa051129fb251f5c40f0f7a270c89fbcb07323730  lib/controller/__init__.py
 826c33f1105be4c0985e1bbe1d75bdb009c17815ad6552fc8d9bf39090d3c40f  lib/core/agent.py
 b2d69c99632da5c2acd0c0934e70d55862f1380a3f602cbe7456d617fb9c1fc9  lib/core/bigarray.py
-ba3f0002aa93f8f21f06dbea343573c590b9e6ec160fc6668c15e68a970cfb12  lib/core/common.py
+a4863238aba3a2d203c26127a4a7a6df873bd0c6f1cd798d4a7abcdc71a07cb6  lib/core/common.py
 5c26b0f308266bc3a9679ef837439e38d1dc7a69eac6bd3422280f49aaf114d2  lib/core/compat.py
 b60c96780cad4a257f91a0611b08cfcc52f242908c5d5ab2bf9034ef07869602  lib/core/convert.py
 5e381515873e71c395c77df00bf1dd8c4592afc6210a2f75cbc20daf384e539f  lib/core/data.py
@@ -187,11 +187,11 @@ bf77f9fc4296f239687297aee1fd6113b34f855965a6f690b52e26bd348cb353  lib/core/profi
 4eff81c639a72b261c8ba1c876a01246e718e6626e8e77ae9cc6298b20a39355  lib/core/replication.py
 bbd1dcda835934728efc6d68686e9b0da72b09b3ee38f3c0ab78e8c18b0ba726  lib/core/revision.py
 eed6b0a21b3e69c5583133346b0639dc89937bd588887968ee85f8389d7c3c96  lib/core/session.py
-df96b0f2f935c583492c6331c6f222427976606af9a03ee5f05755a697ea7cec  lib/core/settings.py
+4cc89d1791e21b3bb4739039cb7eb57659370ab7008902eb80871c85a52c263f  lib/core/settings.py
 2bec97d8a950f7b884e31dfe9410467f00d24f21b35672b95f8d68ed59685fd4  lib/core/shell.py
 e90a359b37a55c446c60e70ccd533f87276714d0b09e34f69b0740fd729ddbf8  lib/core/subprocessng.py
 54f7c70b4c7a9931f7ff3c1c12030180bde38e35a306d5e343ad6052919974cd  lib/core/target.py
-5941a7a641ea58b1d9e59ab3c9f4e9e40566ba08842e1cadb51ea8df9faf763f  lib/core/testing.py
+970b1c3e59481f11dd185bdde52f697f7d8dfc3152d24e3d336ec3fab59a857c  lib/core/testing.py
 8cb7424aa9d42d028a6780250effe4e719d9bb35558057f8ebe9e32408a6b80f  lib/core/threads.py
 ff39235aee7e33498c66132d17e6e86e7b8a29754e3fdecd880ca8356b17f791  lib/core/unescaper.py
 2984e4973868f586aa932f00da684bf31718c0331817c9f8721acd71fd661f89  lib/core/update.py
diff --git a/lib/core/common.py b/lib/core/common.py
index 1be307c9d..dd5fc7151 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -1333,7 +1333,10 @@ def isZipFile(filename):
 
     checkFile(filename)
 
-    return openFile(filename, "rb", encoding=None).read(len(ZIP_HEADER)) == ZIP_HEADER
+    with openFile(filename, "rb", encoding=None) as f:
+        header = f.read(len(ZIP_HEADER))
+
+    return header == ZIP_HEADER
 
 def isDigit(value):
     """
@@ -2533,21 +2536,22 @@ def initCommonOutputs():
     kb.commonOutputs = {}
     key = None
 
-    for line in openFile(paths.COMMON_OUTPUTS, 'r'):
-        if line.find('#') != -1:
-            line = line[:line.find('#')]
+    with openFile(paths.COMMON_OUTPUTS, 'r') as f:
+        for line in f:
+            if line.find('#') != -1:
+                line = line[:line.find('#')]
 
-        line = line.strip()
+            line = line.strip()
 
-        if len(line) > 1:
-            if line.startswith('[') and line.endswith(']'):
-                key = line[1:-1]
-            elif key:
-                if key not in kb.commonOutputs:
-                    kb.commonOutputs[key] = set()
+            if len(line) > 1:
+                if line.startswith('[') and line.endswith(']'):
+                    key = line[1:-1]
+                elif key:
+                    if key not in kb.commonOutputs:
+                        kb.commonOutputs[key] = set()
 
-                if line not in kb.commonOutputs[key]:
-                    kb.commonOutputs[key].add(line)
+                    if line not in kb.commonOutputs[key]:
+                        kb.commonOutputs[key].add(line)
 
 def getFileItems(filename, commentPrefix='#', unicoded=True, lowercase=False, unique=False):
     """
@@ -5594,7 +5598,9 @@ def checkSums():
                 expected, filename = match.groups()
                 filepath = os.path.join(paths.SQLMAP_ROOT_PATH, filename).replace('/', os.path.sep)
                 checkFile(filepath)
-                if not hashlib.sha256(open(filepath, "rb").read()).hexdigest() == expected:
+                with open(filepath, "rb") as f:
+                    content = f.read()
+                if not hashlib.sha256(content).hexdigest() == expected:
                     retVal &= False
                     break
 
diff --git a/lib/core/settings.py b/lib/core/settings.py
index 09121dae2..8383d26d5 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 = "1.8.4.3"
+VERSION = "1.8.4.5"
 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/lib/core/testing.py b/lib/core/testing.py
index 319ac88bb..bb6af1ab6 100644
--- a/lib/core/testing.py
+++ b/lib/core/testing.py
@@ -162,7 +162,9 @@ def vulnTest():
     direct = "sqlite3://%s" % database
     tmpdir = tempfile.mkdtemp()
 
-    content = open(os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..", "sqlmap.conf"))).read().replace("url =", "url = %s" % url)
+    with open(os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..", "sqlmap.conf"))) as f:
+        content = f.read().replace("url =", "url = %s" % url)
+
     with open(config, "w+") as f:
         f.write(content)
         f.flush()
@@ -214,7 +216,9 @@ def smokeTest():
 
     unisonRandom()
 
-    content = open(paths.ERRORS_XML, "r").read()
+    with open(paths.ERRORS_XML, "r") as f:
+        content = f.read()
+
     for regex in re.findall(r'<error regexp="(.+?)"/>', content):
         try:
             re.compile(regex)