diff --git a/docs/accept.md b/docs/accept.md
index 87326bb9..1358fdd1 100644
--- a/docs/accept.md
+++ b/docs/accept.md
@@ -11,14 +11,14 @@ Accepts an invitation to play online with an opponent.
 ### Example
 
 ```js
-ws.send('/accept 15f78c0035a719491b89522b4905a490');
+ws.send('/accept e69e3228e22dbcab5c2274646ae9a23647b222d084e26dea3216016d026f7108');
 ```
 
 ```text
 {
   "/accept": {
     "jwt": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJwY2hlc3MubmV0IiwiaWF0IjoxNjk0NDQxOTcxLCJleHAiOjE2OTQ0NDU1NzEsInZhcmlhbnQiOiJjbGFzc2ljYWwiLCJzdWJtb2RlIjoiZnJpZW5kIiwiY29sb3IiOiJ3IiwibWluIjo1LCJpbmNyZW1lbnQiOjMsImZlbiI6InJuYnFrYm5yL3BwcHBwcHBwLzgvOC84LzgvUFBQUFBQUFAvUk5CUUtCTlIgdyBLUWtxIC0ifQ.POuK_cR3U_bblLa8LFyGg1AJEE5_iW_AquuNn7K4qHI",
-    "hash": "15f78c0035a719491b89522b4905a490",
+    "hash": "e69e3228e22dbcab5c2274646ae9a23647b222d084e26dea3216016d026f7108",
     "timer": {
       "w": 300,
       "b": 300
diff --git a/docs/online-games.md b/docs/online-games.md
index ccc6f084..38807abb 100644
--- a/docs/online-games.md
+++ b/docs/online-games.md
@@ -23,7 +23,7 @@ ws.send('/online_games');
       "min": 5,
       "increment": 1,
       "fen": "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -",
-      "hash": "84a4e20138e54e1869b9b79e7d3111f1"
+      "hash": "d1a4f2f3688e3211e94fe643a679204806cd196303e44522e833815e4f728c65"
     },
     {
       "iss": "async.chesslablab.org",
@@ -36,7 +36,7 @@ ws.send('/online_games');
       "increment": 5,
       "fen": "bqrnnbkr/pppppppp/8/8/8/8/PPPPPPPP/BQRNNBKR w KQkq -",
       "startPos": "BQRNNBKR",
-      "hash": "c6b79ac68055766c2a33364f69c72e4c"
+      "hash": "e71a27a35d021acfe9ad819348ec2c574f1962aa14fddc58df379d0b3c225cc8"
     },
     {
       "iss": "async.chesslablab.org",
@@ -48,7 +48,7 @@ ws.send('/online_games');
       "min": 30,
       "increment": 10,
       "fen": "rnabqkbcnr/pppppppppp/10/10/10/10/PPPPPPPPPP/RNABQKBCNR w KQkq -",
-      "hash": "076bafad0559def2db7866609680074c"
+      "hash": "2e2c447c902a34f55145769fe9454cf055a6b3e7658756ade2b2ac783d24c568"
     }
   ]
 }
diff --git a/docs/restart.md b/docs/restart.md
index bc49cc0d..fbe1bf97 100644
--- a/docs/restart.md
+++ b/docs/restart.md
@@ -18,7 +18,7 @@ ws.send('/restart ffc536a8f44fc21b4d254e4fb85d7e33');
 {
   "/restart": {
     "jwt": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJwY2hlc3MubmV0IiwiaWF0IjoxNjk0MTAxOTI2LCJleHAiOjE2OTQxMDU1MjYsInZhcmlhbnQiOiJjbGFzc2ljYWwiLCJzdWJtb2RlIjoib25saW5lIiwiY29sb3IiOiJ3IiwibWluIjo1LCJpbmNyZW1lbnQiOjMsImZlbiI6InJuYnFrYm5yL3BwcHBwcHBwLzgvOC84LzgvUFBQUFBQUFAvUk5CUUtCTlIgdyBLUWtxIC0ifQ.sE6Is9GYf0R6l0_C8rt7VPE8fVChsYlb9teEQw_2QUQ",
-    "hash": "23bb4c7ec2e5a33f436b41376bb41064",
+    "hash": "5665d2e6c84344db95aa9fdbb3bc196b88238bce22a1c58a41f2f269deee6c33",
     "timer": {
       "w": 300,
       "b": 300
diff --git a/docs/start.md b/docs/start.md
index f8331c4e..0a324ec2 100644
--- a/docs/start.md
+++ b/docs/start.md
@@ -133,8 +133,8 @@ ws.send('/start classical play {"min":5,"increment":3,"color":"b","submode":"onl
     "variant": "classical",
     "mode": "play",
     "fen": "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -",
-    "jwt": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJjaGVzc2xhYmxhYi5uZXQiLCJpYXQiOjE3MDQ5ODM1NzUsImV4cCI6MTcwNDk4NzE3NSwidmFyaWFudCI6ImNsYXNzaWNhbCIsInN1Ym1vZGUiOiJvbmxpbmUiLCJjb2xvciI6ImIiLCJtaW4iOjUsImluY3JlbWVudCI6MywiZmVuIjoicm5icWtibnIvcHBwcHBwcHAvOC84LzgvOC9QUFBQUFBQUC9STkJRS0JOUiB3IEtRa3EgLSJ9.DMIDU7I52Reuz0VNHTXlGn6FLv3dc6KMEZRf9ephh1k",
-    "hash": "3d5f1b067edae5a59a2a9595e96bde54"
+    "jwt": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJhc3luYy5jaGVzc2xhYmxhYi5vcmciLCJpYXQiOjE3MTA1MjM2MzUsImV4cCI6MTcxMDUyNzIzNSwidmFyaWFudCI6ImNsYXNzaWNhbCIsInN1Ym1vZGUiOiJvbmxpbmUiLCJjb2xvciI6InciLCJtaW4iOiI1IiwiaW5jcmVtZW50IjoiMyIsImZlbiI6InJuYnFrYm5yL3BwcHBwcHBwLzgvOC84LzgvUFBQUFBQUFAvUk5CUUtCTlIgdyBLUWtxIC0ifQ.gGEgw7zZmJk3ftnS9Yu-RcvhFBzc9eKbvF_45hrEt4E",
+    "hash": "db4a87907dfaaede54c56b3edddbe7e3a8c01803f8906be7bb7a2e180353ce58"
   }
 }
 ```
@@ -155,8 +155,8 @@ ws.send('/start classical play "{\\"min\\":5,\\"increment\\":3,\\"color\\":\\"w\
     "variant": "classical",
     "mode": "play",
     "fen": "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq -",
-    "jwt": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJjaGVzc2xhYmxhYi5uZXQiLCJpYXQiOjE3MDQ5NjYwNTMsImV4cCI6MTcwNDk2OTY1MywidmFyaWFudCI6ImNsYXNzaWNhbCIsInN1Ym1vZGUiOiJmcmllbmQiLCJjb2xvciI6InciLCJtaW4iOjUsImluY3JlbWVudCI6MywiZmVuIjoicm5icWtibnIvcHBwcHBwcHAvOC84LzgvOC9QUFBQUFBQUC9STkJRS0JOUiB3IEtRa3EgLSJ9._ehztodTLYkyovW82I1qyGdNkFwGFdTKn3O7EBr3cHo",
-    "hash": "b4f1c0d0b28cad147968729f6bb76558"
+    "jwt": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJhc3luYy5jaGVzc2xhYmxhYi5vcmciLCJpYXQiOjE3MTA1MjM5MzUsImV4cCI6MTcxMDUyNzUzNSwidmFyaWFudCI6ImNsYXNzaWNhbCIsInN1Ym1vZGUiOiJmcmllbmQiLCJjb2xvciI6ImIiLCJtaW4iOiI1IiwiaW5jcmVtZW50IjoiMyIsImZlbiI6InJuYnFrYm5yL3BwcHBwcHBwLzgvOC84LzgvUFBQUFBQUFAvUk5CUUtCTlIgdyBLUWtxIC0ifQ.Tl_loA70IUidZ9XG9Pw9osC9MZIHbxjg_eDMkGS6des",
+    "hash": "7eb1642c7d5faf2dee2e5dd5aef871c55fe29b5791c8e67746664e8f2517727c"
   }
 }
 ```
diff --git a/src/Command/AcceptPlayRequestCommand.php b/src/Command/AcceptPlayRequestCommand.php
index dfb0eee6..b65029e4 100644
--- a/src/Command/AcceptPlayRequestCommand.php
+++ b/src/Command/AcceptPlayRequestCommand.php
@@ -58,7 +58,7 @@ public function run(ChesslaBlabSocket $socket, array $argv, int $id)
             return $socket->getClientStorage()->sendToMany($ids, [
                 $this->name => [
                     'jwt' => $gameMode->getJwt(),
-                    'hash' => md5($gameMode->getJwt()),
+                    'hash' => hash('sha256', $gameMode->getJwt()),
                     'timer' => $gameMode->getTimer(),
                     'startedAt' => $gameMode->getStartedAt(),
                 ],
diff --git a/src/Command/RestartCommand.php b/src/Command/RestartCommand.php
index e1392033..efd1cd0e 100644
--- a/src/Command/RestartCommand.php
+++ b/src/Command/RestartCommand.php
@@ -63,7 +63,7 @@ public function run(ChesslaBlabSocket $socket, array $argv, int $id)
             return $socket->getClientStorage()->sendToMany($newGameMode->getResourceIds(), [
                 $this->name => [
                     'jwt' => $newJwt,
-                    'hash' => md5($newJwt),
+                    'hash' => hash('sha256', $newJwt),
                     'timer' => $newGameMode->getTimer(),
                 ],
             ]);
diff --git a/src/Command/StartCommand.php b/src/Command/StartCommand.php
index 4e3a417c..f8bb7ed4 100644
--- a/src/Command/StartCommand.php
+++ b/src/Command/StartCommand.php
@@ -295,7 +295,7 @@ public function run(ChesslaBlabSocket $socket, array $argv, int $id)
                     'mode' => $argv[2],
                     'fen' => $game->getBoard()->toFen(),
                     'jwt' => $jwt,
-                    'hash' => md5($jwt),
+                    'hash' => hash('sha256', $jwt),
                     ...($argv[1] === Game::VARIANT_960
                         ? ['startPos' =>  implode('', $game->getBoard()->getStartPos())]
                         : []
diff --git a/src/Game/PlayMode.php b/src/Game/PlayMode.php
index 1498186c..501147d3 100644
--- a/src/Game/PlayMode.php
+++ b/src/Game/PlayMode.php
@@ -35,7 +35,7 @@ public function __construct(Game $game, array $resourceIds, string $jwt)
         parent::__construct($game, $resourceIds);
 
         $this->jwt = $jwt;
-        $this->hash = md5($jwt);
+        $this->hash = hash('sha256', $jwt);
         $this->status = self::STATUS_PENDING;
     }
 
@@ -126,7 +126,7 @@ public function res($argv, $cmd)
                       'timer' => $this->timer,
                     ],
                 ];
-                
+
             default:
                 return parent::res($argv, $cmd);
         }