diff --git a/psalm.xml b/psalm.xml
index bd44196..38edc2c 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -14,4 +14,7 @@
             <directory name="vendor" />
         </ignoreFiles>
     </projectFiles>
+    <issueHandlers>
+        <UndefinedAttributeClass errorLevel="suppress" />
+    </issueHandlers>
 </psalm>
diff --git a/src/ViaAuthorization.php b/src/ViaAuthorization.php
index 1a3a79c..32873b8 100644
--- a/src/ViaAuthorization.php
+++ b/src/ViaAuthorization.php
@@ -24,6 +24,7 @@ private function __construct(private \Closure $resolve)
     /**
      * @return Attempt<T>
      */
+    #[\NoDiscard]
     public function __invoke(ServerRequest $request): Attempt
     {
         return $request
@@ -40,6 +41,7 @@ public function __invoke(ServerRequest $request): Attempt
      *
      * @return self<A>
      */
+    #[\NoDiscard]
     public static function of(callable $resolve): self
     {
         return new self(\Closure::fromCallable($resolve));
diff --git a/src/ViaBasicAuthorization.php b/src/ViaBasicAuthorization.php
index 86631c7..fee6eff 100644
--- a/src/ViaBasicAuthorization.php
+++ b/src/ViaBasicAuthorization.php
@@ -24,6 +24,7 @@ private function __construct(private \Closure $resolve)
     /**
      * @return Attempt<T>
      */
+    #[\NoDiscard]
     public function __invoke(ServerRequest $request): Attempt
     {
         return $request
@@ -51,6 +52,7 @@ public function __invoke(ServerRequest $request): Attempt
      *
      * @return self<A>
      */
+    #[\NoDiscard]
     public static function of(callable $resolve): self
     {
         return new self(\Closure::fromCallable($resolve));
diff --git a/src/ViaForm.php b/src/ViaForm.php
index e015c43..9ed0565 100644
--- a/src/ViaForm.php
+++ b/src/ViaForm.php
@@ -28,6 +28,7 @@ private function __construct(private \Closure $resolve)
     /**
      * @return Attempt<T>
      */
+    #[\NoDiscard]
     public function __invoke(ServerRequest $request): Attempt
     {
         return Maybe::just($request)
@@ -43,6 +44,7 @@ public function __invoke(ServerRequest $request): Attempt
      *
      * @return self<A>
      */
+    #[\NoDiscard]
     public static function of(callable $resolve): self
     {
         return new self(\Closure::fromCallable($resolve));
diff --git a/src/ViaUrlAuthority.php b/src/ViaUrlAuthority.php
index da2cb4b..241c5f9 100644
--- a/src/ViaUrlAuthority.php
+++ b/src/ViaUrlAuthority.php
@@ -25,6 +25,7 @@ private function __construct(private \Closure $resolve)
     /**
      * @return Attempt<T>
      */
+    #[\NoDiscard]
     public function __invoke(ServerRequest $request): Attempt
     {
         $user = $request->url()->authority()->userInformation()->user();
@@ -45,6 +46,7 @@ public function __invoke(ServerRequest $request): Attempt
      *
      * @return self<A>
      */
+    #[\NoDiscard]
     public static function of(callable $resolve): self
     {
         return new self(\Closure::fromCallable($resolve));