diff --git a/snscrape/base.py b/snscrape/base.py
index a79c957..bda493f 100644
--- a/snscrape/base.py
+++ b/snscrape/base.py
@@ -139,7 +139,7 @@ class Scraper:
 
 	name = None
 
-	def __init__(self, retries = 3, proxies = None):
+	def __init__(self, *, retries = 3, proxies = None):
 		self._retries = retries
 		self._proxies = proxies
 		self._session = requests.Session()
diff --git a/snscrape/modules/mastodon.py b/snscrape/modules/mastodon.py
index 6945691..cfe69e4 100644
--- a/snscrape/modules/mastodon.py
+++ b/snscrape/modules/mastodon.py
@@ -92,8 +92,8 @@ class CustomEmoji:
 
 
 class _MastodonCommonScraper(snscrape.base.Scraper):
-	def __init__(self, *args, **kwargs):
-		super().__init__(*args, **kwargs)
+	def __init__(self, **kwargs):
+		super().__init__(**kwargs)
 		self._headers = {'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0', 'Accept-Language': 'en-US,en;q=0.5'}
 		self._lastRequest = 0
 
@@ -245,8 +245,8 @@ class _MastodonCommonScraper(snscrape.base.Scraper):
 class MastodonProfileScraper(_MastodonCommonScraper):
 	name = 'mastodon-profile'
 
-	def __init__(self, account, *args, **kwargs):
-		super().__init__(*args, **kwargs)
+	def __init__(self, account, **kwargs):
+		super().__init__(**kwargs)
 		if account.startswith('@') and account.count('@') == 2:
 			account, domain = account[1:].split('@')
 			url = f'https://{domain}/@{account}'
@@ -310,8 +310,8 @@ class MastodonTootScraperMode(enum.Enum):
 class MastodonTootScraper(_MastodonCommonScraper):
 	name = 'mastodon-toot'
 
-	def __init__(self, url, mode, *args, **kwargs):
-		super().__init__(*args, **kwargs)
+	def __init__(self, url, *, mode = MastodonTootScraperMode.SINGLE, **kwargs):
+		super().__init__(**kwargs)
 		self._url = url
 		self._mode = mode
 
@@ -337,4 +337,4 @@ class MastodonTootScraper(_MastodonCommonScraper):
 
 	@classmethod
 	def _cli_from_args(cls, args):
-		return cls._cli_construct(args, args.url, MastodonTootScraperMode._cli_from_args(args))
+		return cls._cli_construct(args, args.url, mode = MastodonTootScraperMode._cli_from_args(args))
diff --git a/snscrape/modules/reddit.py b/snscrape/modules/reddit.py
index ffbb8b6..e477901 100644
--- a/snscrape/modules/reddit.py
+++ b/snscrape/modules/reddit.py
@@ -47,7 +47,7 @@ class Comment(snscrape.base.Item):
 
 
 class _RedditPushshiftScraper(snscrape.base.Scraper):
-	def __init__(self, name, submissions = True, comments = True, before = None, after = None, **kwargs):
+	def __init__(self, name, *, submissions = True, comments = True, before = None, after = None, **kwargs):
 		super().__init__(**kwargs)
 		self._name = name
 		self._submissions = submissions
diff --git a/snscrape/modules/twitter.py b/snscrape/modules/twitter.py
index 0a36384..4b7cdb9 100644
--- a/snscrape/modules/twitter.py
+++ b/snscrape/modules/twitter.py
@@ -268,7 +268,7 @@ class _CLIGuestTokenManager(GuestTokenManager):
 
 
 class _TwitterAPIScraper(snscrape.base.Scraper):
-	def __init__(self, baseUrl, guestTokenManager = None, **kwargs):
+	def __init__(self, baseUrl, *, guestTokenManager = None, **kwargs):
 		super().__init__(**kwargs)
 		self._baseUrl = baseUrl
 		if guestTokenManager is None:
@@ -618,7 +618,7 @@ class _TwitterAPIScraper(snscrape.base.Scraper):
 class TwitterSearchScraper(_TwitterAPIScraper):
 	name = 'twitter-search'
 
-	def __init__(self, query, cursor = None, top = False, **kwargs):
+	def __init__(self, query, *, cursor = None, top = False, **kwargs):
 		if not query.strip():
 			raise ValueError('empty query')
 		super().__init__(baseUrl = 'https://twitter.com/search?' + urllib.parse.urlencode({'f': 'live', 'lang': 'en', 'q': query, 'src': 'spelling_expansion_revert_click'}), **kwargs)
@@ -847,7 +847,7 @@ class TwitterTweetScraperMode(enum.Enum):
 class TwitterTweetScraper(_TwitterAPIScraper):
 	name = 'twitter-tweet'
 
-	def __init__(self, tweetId, mode = TwitterTweetScraperMode.SINGLE, **kwargs):
+	def __init__(self, tweetId, *, mode = TwitterTweetScraperMode.SINGLE, **kwargs):
 		self._tweetId = tweetId
 		self._mode = mode
 		super().__init__(f'https://twitter.com/i/web/status/{self._tweetId}', **kwargs)
@@ -911,7 +911,7 @@ class TwitterTweetScraper(_TwitterAPIScraper):
 
 	@classmethod
 	def _cli_from_args(cls, args):
-		return cls._cli_construct(args, args.tweetId, TwitterTweetScraperMode._cli_from_args(args))
+		return cls._cli_construct(args, args.tweetId, mode = TwitterTweetScraperMode._cli_from_args(args))
 
 
 class TwitterListPostsScraper(TwitterSearchScraper):