diff --git a/telebot/apihelper.py b/telebot/apihelper.py
index ae72e37..a5e1df3 100644
--- a/telebot/apihelper.py
+++ b/telebot/apihelper.py
@@ -27,8 +27,8 @@ CONNECT_TIMEOUT = 3.5
 READ_TIMEOUT = 9999
 
 
-def _get_req_session():
-    return util.per_thread('req_session', lambda: requests.session())
+def _get_req_session(reset=False):
+    return util.per_thread('req_session', lambda: requests.session(), reset)
 
 
 def _make_request(token, method_name, method='get', params=None, files=None, base_url=API_URL):
diff --git a/telebot/util.py b/telebot/util.py
index f448d78..e16ebb5 100644
--- a/telebot/util.py
+++ b/telebot/util.py
@@ -248,13 +248,12 @@ def extract_arguments(text):
     return result.group(2) if is_command(text) else None
 
 
-def per_thread(key, construct_value):
-    try:
-        return getattr(thread_local, key)
-    except AttributeError:
+def per_thread(key, construct_value, reset=False):
+    if reset or not hasattr(thread_local, key):
         value = construct_value()
         setattr(thread_local, key, value)
-        return value
+
+    return getattr(thread_local, key)
 
 
 def generate_random_token():