diff --git a/squinnondation/hazel.py b/squinnondation/hazel.py
index dd74177..68f2d0e 100644
--- a/squinnondation/hazel.py
+++ b/squinnondation/hazel.py
@@ -130,22 +130,17 @@ class Squirrel(Hazelnut):
         """
         Send a formatted packet to a client.
         """
-        self.refresh_lock.acquire()
         if len(pkt) > 1024:
             # The packet is too large to be sent by the protocol. We split the packet in subpackets.
             return sum(self.send_packet(client, subpkt) for subpkt in pkt.split(1024))
         res = self.send_raw_data(client, pkt.marshal())
-        self.refresh_lock.release()
         return res
 
     def send_raw_data(self, client: Hazelnut, data: bytes) -> int:
         """
         Send a raw packet to a client.
         """
-        self.refresh_lock.acquire()
-        res = self.socket.sendto(data, client.main_address)
-        self.refresh_lock.release()
-        return res
+        return self.socket.sendto(data, client.main_address)
 
     def receive_packet(self) -> Tuple[Packet, Hazelnut]:
         """
@@ -368,7 +363,6 @@ class Squirrel(Hazelnut):
         """
         Remove the sender from the list of neighbours to be inundated
         """
-        self.refresh_lock.acquire()
         if (sender_id, nonce) in self.recent_messages:
             # If a peer is late in its acknowledgement, the absence of the previous if causes an error.
             for addr in hazel.addresses:
@@ -376,26 +370,19 @@ class Squirrel(Hazelnut):
 
             if not self.recent_messages[(sender_id, nonce)][2]:  # If dictionnary is empty, remove the message
                 self.recent_messages.pop((sender_id, nonce), None)
-        self.refresh_lock.release()
 
     def clean_inundation(self) -> None:
         """
         Remove messages which are overdue (older than 2 minutes) from the inundation dictionnary.
         """
-        self.refresh_lock.acquire()
-
         for key in self.recent_messages:
             if time.time() - self.recent_messages[key][1] > 120:
                 self.recent_messages.pop(key)
 
-        self.refresh_lock.release()
-
     def main_inundation(self) -> None:
         """
         The main inundation function.
         """
-        self.refresh_lock.acquire()
-
         for key in self.recent_messages:
             k = list(self.recent_messages[key][2].keys())
             for key2 in k:
@@ -418,8 +405,6 @@ class Squirrel(Hazelnut):
                     self.send_packet(hazelnut, pkt)
                     self.recent_messages[key][2].pop(key2)
 
-        self.refresh_lock.release()
-
     def add_system_message(self, msg: str) -> None:
         """
         Add a new system log message.
@@ -619,8 +604,6 @@ class Squirrel(Hazelnut):
         Returns a list of hazelnuts the squirrel should contact if it does
         not have enough symmetric neighbours.
         """
-        self.refresh_lock.acquire()
-
         res = []
         lp = len(self.potentialhazelnuts)
         val = list(self.potentialhazelnuts.values())
@@ -628,30 +611,22 @@ class Squirrel(Hazelnut):
         for i in range(min(lp, max(0, self.minNS - self.nbNS))):
             a = randint(0, lp - 1)
             res.append(val[a])
-
-        self.refresh_lock.release()
         return res
 
     def send_hello(self) -> None:
         """
         Sends a long HelloTLV to all active neighbours.
         """
-        self.refresh_lock.acquire()
-
         for hazelnut in self.activehazelnuts.values():
             htlv = HelloTLV().construct(16, self, hazelnut)
             pkt = Packet().construct(htlv)
             self.send_packet(hazelnut, pkt)
 
-        self.refresh_lock.release()
-
     def verify_activity(self) -> None:
         """
         All neighbours that have not sent a HelloTLV in the last 2
         minutes are considered not active.
         """
-        self.refresh_lock.acquire()
-
         val = list(self.activehazelnuts.values())  # create a copy because the dict size will change
 
         for hazelnut in val:
@@ -662,8 +637,6 @@ class Squirrel(Hazelnut):
                 hazelnut.active = False
                 self.update_hazelnut_table(hazelnut)
 
-        self.refresh_lock.release()
-
     def update_hazelnut_table(self, hazelnut: Hazelnut) -> None:
         for addr in hazelnut.addresses:
             if addr in self.hazelnuts:
@@ -678,8 +651,6 @@ class Squirrel(Hazelnut):
         Update the number of symmetric neighbours and
         send all neighbours NeighbourTLV
         """
-        self.refresh_lock.acquire()
-
         nb_ns = 0
         # could send the same to all neighbour, but it means that neighbour
         # A could receive a message with itself in it -> if the others do not pay attention, trouble
@@ -696,14 +667,10 @@ class Squirrel(Hazelnut):
                 self.activehazelnuts[key].symmetric = False
         self.nbNS = nb_ns
 
-        self.refresh_lock.release()
-
     def leave(self) -> None:
         """
         The program is exited. We send a GoAway to our neighbours, then close the program.
         """
-        self.refresh_lock.acquire()
-
         # Last inundation
         self.main_inundation()
         self.clean_inundation()