diff --git a/ipwb/__main__.py b/ipwb/__main__.py
index a57c22ab..a767c316 100644
--- a/ipwb/__main__.py
+++ b/ipwb/__main__.py
@@ -43,16 +43,16 @@ def checkArgs_replay(args):
 
         random.seed()
         # Write data to temp file (sub-optimal)
-        tempFilePath = tempfile.gettempdir() + '/' + ''.join(random.sample(
-              string.ascii_uppercase + string.digits * 6, 12)) + '.cdxj'
-        with open(tempFilePath, 'w') as f:
-            f.write(cdxjIn)
-        args.index = tempFilePath
+
+        tf = tempfile.NamedTemporaryFile(mode='w', suffix='.cdxj')
+        tf.write(cdxjIn)
+        args.index = tf.name
+        tf.close()
         suppliedIndexParameter = True
 
     proxy = None
     if hasattr(args, 'proxy') and args.proxy is not None:
-        print('Proxying to ' + args.proxy)
+        print(f'Proxying to {args.proxy}')
         proxy = args.proxy
 
     # TODO: add any other sub-arguments for replay here
@@ -60,7 +60,8 @@ def checkArgs_replay(args):
         replay.start(cdxjFilePath=args.index, proxy=proxy)
     else:
         print('ERROR: An index file must be specified if not piping, e.g.,')
-        print('> ipwb replay /path/to/your/index.cdxj\n')
+        print(("> ipwb replay "
+               f"{os.path.join('path', 'to', 'your', 'index.cdxj')}\n"))
 
         args.onError()
         sys.exit()
diff --git a/ipwb/util.py b/ipwb/util.py
index 2bc7451e..63767503 100644
--- a/ipwb/util.py
+++ b/ipwb/util.py
@@ -36,7 +36,7 @@
 (IPWBREPLAY_HOST, IPWBREPLAY_PORT) = IPWBREPLAY_ADDRESS.split(':')
 IPWBREPLAY_PORT = int(IPWBREPLAY_PORT)
 
-INDEX_FILE = 'samples/indexes/salam-home.cdxj'
+INDEX_FILE = os.path.join('samples', 'indexes', 'salam-home.cdxj')
 
 log = logging.getLogger('werkzeug')
 log.setLevel(logging.ERROR)
@@ -219,9 +219,10 @@ def fetch_remote_file(path):
 
 # IPFS Config manipulation from here on out.
 def readIPFSConfig():
-    ipfsConfigPath = expanduser("~") + '/.ipfs/config'
+    ipfsConfigPath = os.path.join(expanduser("~"), '.ipfs', 'config')
     if 'IPFS_PATH' in os.environ:
-        ipfsConfigPath = os.environ.get('IPFS_PATH') + '/config'
+        ipfsConfigPath = os.path.join(
+            os.environ.get('IPFS_PATH'), 'config')
 
     try:
         with open(ipfsConfigPath, 'r') as f:
@@ -234,9 +235,10 @@ def readIPFSConfig():
 
 
 def writeIPFSConfig(jsonToWrite):
-    ipfsConfigPath = expanduser("~") + '/.ipfs/config'
+    ipfsConfigPath = os.path.join(expanduser("~"), '.ipfs', 'config')
     if 'IPFS_PATH' in os.environ:
-        ipfsConfigPath = os.environ.get('IPFS_PATH') + '/config'
+        ipfsConfigPath = os.path.join(
+            os.environ.get('IPFS_PATH'), 'config')
 
     with open(ipfsConfigPath, 'w') as f:
         f.write(json.dumps(jsonToWrite, indent=4, sort_keys=True))
diff --git a/tests/testUtil.py b/tests/testUtil.py
index b378848b..96a3b168 100644
--- a/tests/testUtil.py
+++ b/tests/testUtil.py
@@ -11,6 +11,7 @@
 from ipwb import __file__ as moduleLocation
 
 from multiprocessing import Process
+from pathlib import Path
 
 p = Process()
 
@@ -18,8 +19,9 @@
 def createUniqueWARC():
     lines = []
     warcInFilename = 'frogTest.warc'
-    warcInPath = os.path.join(os.path.dirname(__file__) +
-                              '/../samples/warcs/' + warcInFilename)
+    warcInPath = os.path.join(
+        Path(os.path.dirname(__file__)).parent,
+        'samples', 'warcs', warcInFilename)
 
     stringToChange = b'abcdefghijklmnopqrstuvwxz'
     randomString = getRandomString(len(stringToChange))
@@ -30,8 +32,10 @@ def createUniqueWARC():
 
     warcOutFilename = warcInFilename.replace('.warc', '_' +
                                              randomString + '.warc')
-    warcOutPath = os.path.join(os.path.dirname(__file__) +
-                               '/../samples/warcs/' + warcOutFilename)
+    warcOutPath = os.path.join(
+        Path(os.path.dirname(__file__)).parent,
+        'samples', 'warcs', warcOutFilename)
+
     print(warcOutPath)
     with open(warcOutPath, 'wb') as warcFile:
         warcFile.write(newContent)
@@ -55,12 +59,13 @@ def countCDXJEntries(cdxjData):
 
 def startReplay(warcFilename):
     global p
-    pathOfWARC = os.path.join(os.path.dirname(__file__) +
-                              '/../samples/warcs/' + warcFilename)
-    tempFilePath = tempfile.gettempdir() + '/' + ''.join(random.sample(
-        string.ascii_uppercase + string.digits * 6, 12)) + '.cdxj'
+    pathOfWARC = os.path.join(
+        Path(os.path.dirname(__file__)).parent,
+        'samples', 'warcs', warcFilename)
 
-    open(tempFilePath, 'a').close()  # Create placeholder file for replay
+    tf = tempfile.NamedTemporaryFile(mode='a', suffix='.cdxj')
+    tempFilePath = tf.name
+    tf.close()
 
     p = Process(target=replay.start, args=[tempFilePath])
     p.start()
diff --git a/tests/test_indexing.py b/tests/test_indexing.py
index 0f8edc4e..c16c6084 100644
--- a/tests/test_indexing.py
+++ b/tests/test_indexing.py
@@ -6,6 +6,8 @@
 
 from ipwb import indexer
 
+from pathlib import Path
+
 
 def test_cdxj_warc_responseRecordCount():
     newWARCPath = ipwbTest.createUniqueWARC()
@@ -18,8 +20,9 @@ def test_cdxj_warc_responseRecordCount():
 # A response record's content-length causes the payload to truncate
 # WARC-Response record for html should still exist in output
 def test_warc_ipwbIndexerBrokenWARCRecord():
-    pathOfBrokenWARC = os.path.join(os.path.dirname(__file__) +
-                                    '/../samples/warcs/broken.warc')
+    pathOfBrokenWARC = os.path.join(
+        Path(os.path.dirname(__file__)).parent,
+        'samples', 'warcs', 'broken.warc')
     cdxjList = indexer.indexFileAt(pathOfBrokenWARC, quiet=True)
     cdxj = '\n'.join(cdxjList)
     assert ipwbTest.countCDXJEntries(cdxj) == 1