diff --git a/composer.json b/composer.json
index dd7ef9b..9838f5c 100644
--- a/composer.json
+++ b/composer.json
@@ -48,7 +48,7 @@
         "amphp/phpunit-util": "^3",
         "phpunit/phpunit": "^9",
         "amphp/php-cs-fixer-config": "^2",
-        "psalm/phar": "^5.4"
+        "psalm/phar": "5.20"
     },
     "autoload": {
         "psr-4": {
diff --git a/psalm.xml b/psalm.xml
index 8b8f1f5..124dc90 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -40,6 +40,12 @@
             </errorLevel>
         </MissingClosureReturnType>
 
+        <RiskyTruthyFalsyComparison>
+            <errorLevel type="suppress">
+                <directory name="src" />
+            </errorLevel>
+        </RiskyTruthyFalsyComparison>
+
         <UnsupportedPropertyReferenceUsage>
             <errorLevel type="suppress">
                 <directory name="src" />
diff --git a/src/Internal/Socket.php b/src/Internal/Socket.php
index 1f14620..aeba1ee 100755
--- a/src/Internal/Socket.php
+++ b/src/Internal/Socket.php
@@ -163,7 +163,7 @@ final public function ask(Question $question, float $timeout, ?Cancellation $can
 
         $invalidPacketsReceived = &$this->invalidPacketsReceived;
 
-        /** @psalm-suppress InaccessibleProperty $this->pending is an ArrayObject */
+        /** @psalm-suppress InaccessibleProperty, InvalidArgument $this->pending is an ArrayObject */
         $this->pending[$id] = new class($this->pending, $id, $deferred, $question, $timeout, $invalidPacketsReceived) {
             private readonly string $callbackId;