diff --git a/src/danog/MadelineProto/Coroutine.php b/src/danog/MadelineProto/Coroutine.php
index ea292191..e9284c6c 100644
--- a/src/danog/MadelineProto/Coroutine.php
+++ b/src/danog/MadelineProto/Coroutine.php
@@ -100,7 +100,7 @@ final class Coroutine implements Promise, \ArrayAccess, JsonSerializable
          * @param \Throwable|null $exception Exception to be thrown into the generator.
          * @param mixed           $value Value to be sent into the generator.
          */
-        $this->onResolve = function ($exception, $value) {
+        $this->onResolve = function ($exception, $value): void {
             $this->exception = $exception;
             $this->value = $value;
             if (!$this->immediate) {
diff --git a/src/danog/MadelineProto/Db/DbPropertiesFactory.php b/src/danog/MadelineProto/Db/DbPropertiesFactory.php
index a7e39c06..d9a51748 100644
--- a/src/danog/MadelineProto/Db/DbPropertiesFactory.php
+++ b/src/danog/MadelineProto/Db/DbPropertiesFactory.php
@@ -24,6 +24,7 @@ abstract class DbPropertiesFactory
      * @param string $table
      * @param self::TYPE_*|array $propertyType
      * @param $value
+     * @param DriverArray|null $value
      *
      * @return Promise<DbType>
      *
diff --git a/src/danog/MadelineProto/Loop/Update/FeedLoop.php b/src/danog/MadelineProto/Loop/Update/FeedLoop.php
index d64f6f34..9d547005 100644
--- a/src/danog/MadelineProto/Loop/Update/FeedLoop.php
+++ b/src/danog/MadelineProto/Loop/Update/FeedLoop.php
@@ -126,7 +126,7 @@ class FeedLoop extends ResumableSignalLoop
                 continue;
             }
             if (isset($update['pts'], $update['pts_count'])) {
-                $logger = function ($msg) use ($update) {
+                $logger = function ($msg) use ($update): void {
                     $pts_count = $update['pts_count'];
                     $mid = isset($update['message']['id']) ? $update['message']['id'] : '-';
                     $mypts = $this->state->pts();
diff --git a/src/danog/MadelineProto/Loop/Update/SeqLoop.php b/src/danog/MadelineProto/Loop/Update/SeqLoop.php
index 3f80565a..85f81049 100644
--- a/src/danog/MadelineProto/Loop/Update/SeqLoop.php
+++ b/src/danog/MadelineProto/Loop/Update/SeqLoop.php
@@ -119,7 +119,10 @@ class SeqLoop extends ResumableSignalLoop
             yield from $this->save($update);
         }
     }
-    public function feed($updates): void
+    /**
+     * @param (array|mixed)[] $updates
+     */
+    public function feed(array $updates): void
     {
         $this->API->logger->logger('Was fed updates of type '.$updates['_'].'...', \danog\MadelineProto\Logger::VERBOSE);
         $this->incomingUpdates[] = $updates;
@@ -128,7 +131,10 @@ class SeqLoop extends ResumableSignalLoop
     {
         $this->pendingWakeups += (yield from $this->feeder->feed($updates['updates']));
     }
-    public function addPendingWakeups($wakeups): void
+    /**
+     * @param true[] $wakeups
+     */
+    public function addPendingWakeups(array $wakeups): void
     {
         $this->pendingWakeups += $wakeups;
     }
diff --git a/src/danog/MadelineProto/Loop/Update/UpdateLoop.php b/src/danog/MadelineProto/Loop/Update/UpdateLoop.php
index d1fc05a4..abea2d14 100644
--- a/src/danog/MadelineProto/Loop/Update/UpdateLoop.php
+++ b/src/danog/MadelineProto/Loop/Update/UpdateLoop.php
@@ -216,7 +216,7 @@ class UpdateLoop extends ResumableSignalLoop
             }
         }
     }
-    public function setLimit($toPts): void
+    public function setLimit(int $toPts): void
     {
         $this->toPts = $toPts;
     }
diff --git a/src/danog/MadelineProto/MTProtoTools/AuthKeyHandler.php b/src/danog/MadelineProto/MTProtoTools/AuthKeyHandler.php
index 16bd99dd..68c3e603 100644
--- a/src/danog/MadelineProto/MTProtoTools/AuthKeyHandler.php
+++ b/src/danog/MadelineProto/MTProtoTools/AuthKeyHandler.php
@@ -543,7 +543,7 @@ trait AuthKeyHandler
                     $this->pending_auth = true;
                     continue;
                 }
-                $dcs[$id] = function () use ($id, $socket) {
+                $dcs[$id] = function () use ($id, $socket): \Generator {
                     return $this->initAuthorizationSocket($id, $socket);
                 };
             }
diff --git a/src/danog/MadelineProto/MTProtoTools/Files.php b/src/danog/MadelineProto/MTProtoTools/Files.php
index 6512bc00..1711a401 100644
--- a/src/danog/MadelineProto/MTProtoTools/Files.php
+++ b/src/danog/MadelineProto/MTProtoTools/Files.php
@@ -121,7 +121,7 @@ trait Files
             throw new Exception('Invalid callable provided');
         }
         if ($cb === null) {
-            $cb = function ($percent) {
+            $cb = function ($percent): void {
                 $this->logger->logger('Upload status: '.$percent.'%', \danog\MadelineProto\Logger::NOTICE);
             };
         }
@@ -155,7 +155,7 @@ trait Files
         $promises = [];
         $speed = 0;
         $time = 0;
-        $cb = function () use ($cb, $part_total_num, &$speed, &$time) {
+        $cb = function () use ($cb, $part_total_num, &$speed, &$time): void {
             static $cur = 0;
             $cur++;
             Tools::callFork($cb($cur * 100 / $part_total_num, $speed, $time));
@@ -845,7 +845,7 @@ trait Files
             throw new Exception('Wrong callable provided');
         }
         if ($cb === null) {
-            $cb = function ($percent) {
+            $cb = function ($percent): void {
                 $this->logger->logger('Download status: '.$percent.'%', \danog\MadelineProto\Logger::NOTICE);
             };
         }
@@ -898,7 +898,7 @@ trait Files
         $time = 0;
         $speed = 0;
         $origCb = $cb;
-        $cb = static function () use ($cb, $count, &$time, &$speed) {
+        $cb = static function () use ($cb, $count, &$time, &$speed): void {
             static $cur = 0;
             $cur++;
             Tools::callFork($cb($cur * 100 / $count, $time, $speed));
diff --git a/src/danog/MadelineProto/MTProtoTools/PeerHandler.php b/src/danog/MadelineProto/MTProtoTools/PeerHandler.php
index d92da1e0..d3619ce6 100644
--- a/src/danog/MadelineProto/MTProtoTools/PeerHandler.php
+++ b/src/danog/MadelineProto/MTProtoTools/PeerHandler.php
@@ -1089,7 +1089,7 @@ trait PeerHandler
     {
         return $this->channelParticipants[$this->participantsKey($channel['channel_id'], $filter, $q, $offset, $limit)];
     }
-    private function storeParticipantsCache($gres, $channel, $filter, $q, $offset, $limit)
+    private function storeParticipantsCache($gres, $channel, $filter, $q, $offset, $limit): void
     {
         unset($gres['users']);
         $ids = [];
diff --git a/src/danog/MadelineProto/MyTelegramOrgWrapper.php b/src/danog/MadelineProto/MyTelegramOrgWrapper.php
index 7426d3aa..a1f2c2ac 100644
--- a/src/danog/MadelineProto/MyTelegramOrgWrapper.php
+++ b/src/danog/MadelineProto/MyTelegramOrgWrapper.php
@@ -119,7 +119,7 @@ class MyTelegramOrgWrapper
             {
                 $this->logger = $logger;
             }
-            public function getLogger()
+            public function getLogger(): Logger
             {
                 return $this->logger;
             }
diff --git a/src/danog/MadelineProto/Tools.php b/src/danog/MadelineProto/Tools.php
index f1122e3c..3bbba901 100644
--- a/src/danog/MadelineProto/Tools.php
+++ b/src/danog/MadelineProto/Tools.php
@@ -64,7 +64,7 @@ abstract class Tools extends StrTools
      */
     public static function convertJsonTL(array $input): array
     {
-        $cb = static function (&$val) use (&$cb) {
+        $cb = static function (&$val) use (&$cb): void {
             if (isset($val['@type'])) {
                 $val['_'] = $val['@type'];
             } elseif (\is_array($val)) {