diff --git a/ServiceLocatorTrait.php b/ServiceLocatorTrait.php
index 74dfa43..21ff445 100644
--- a/ServiceLocatorTrait.php
+++ b/ServiceLocatorTrait.php
@@ -43,7 +43,7 @@ trait ServiceLocatorTrait
      *
      * @return bool
      */
-    public function has(string $id)
+    public function has(string $id): bool
     {
         return isset($this->factories[$id]);
     }
diff --git a/composer.json b/composer.json
index 353413f..57316ee 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": ">=7.2.5",
-        "psr/container": "^1.1"
+        "psr/container": "^^2"
     },
     "suggest": {
         "symfony/service-implementation": ""

diff --git a/composer.json b/composer.json
index 65777679..bd75a893 100644
--- a/composer.json
+++ b/composer.json
@@ -17,11 +17,21 @@
     ],
     "require": {
         "php": ">=7.2.5",
-        "psr/container": "^1.1.1",
+        "psr/container": "^2",
         "symfony/deprecation-contracts": "^2.1",
         "symfony/polyfill-php80": "^1.15",
diff --git a/Container.php b/Container.php
index f096c75c..0ed5829a 100644
--- a/Container.php
+++ b/Container.php
@@ -186,7 +186,7 @@ class Container implements ContainerInterface, ResetInterface
      *
      * @return bool true if the service is defined, false otherwise
      */
-    public function has(string $id)
+    public function has(string $id): bool
     {
         if (isset($this->aliases[$id])) {
             $id = $this->aliases[$id];
diff --git a/ContainerBuilder.php b/ContainerBuilder.php
index d8d356ad..f006df08 100644
--- a/ContainerBuilder.php
+++ b/ContainerBuilder.php
@@ -518,7 +518,7 @@ class ContainerBuilder extends Container implements TaggedContainerInterface
      *
      * @return bool true if the service is defined, false otherwise
      */
-    public function has(string $id)
+    public function has(string $id): bool
     {
         return isset($this->definitions[$id]) || isset($this->aliasDefinitions[$id]) || parent::has($id);
     }
diff --git a/ContainerInterface.php b/ContainerInterface.php
index 97da9a72..8e5da8c7 100644
--- a/ContainerInterface.php
+++ b/ContainerInterface.php
@@ -53,7 +53,7 @@ interface ContainerInterface extends PsrContainerInterface
     /**
      * @return bool true if the service is defined, false otherwise
      */
-    public function has(string $id);
+    public function has(string $id): bool;
 
     /**
      * Check for whether or not a service has been initialized.
diff --git a/ParameterBag/ContainerBag.php b/ParameterBag/ContainerBag.php
index 025fdaf2..295f16b6 100644
--- a/ParameterBag/ContainerBag.php
+++ b/ParameterBag/ContainerBag.php
@@ -48,7 +48,7 @@ class ContainerBag extends FrozenParameterBag implements ContainerBagInterface
      *
      * @return bool
      */
-    public function has(string $name)
+    public function has(string $name): bool
     {
         return $this->container->hasParameter($name);
     }