diff --git a/composer.json b/composer.json
index 74c6c35..273a54a 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
         "nikic/fast-route": "^1.3",
         "psr/container": "^2.0",
         "psr/http-factory": "^1.0",
-        "psr/http-message": "^1.1|^2.0",
+        "psr/http-message": "^2.0",
         "psr/http-server-handler": "^1.0.1",
         "psr/http-server-middleware": "^1.0.1",
         "opis/closure": "^3.6.3",
diff --git a/tests/DispatchIntegrationTest.php b/tests/DispatchIntegrationTest.php
index 32cb738..4ceb209 100644
--- a/tests/DispatchIntegrationTest.php
+++ b/tests/DispatchIntegrationTest.php
@@ -164,10 +164,10 @@ public function testDispatchesExceptionRoute(): void
 
     public function testDispatchesExceptionWithJsonStrategyRoute(): void
     {
-        $request  = $this->createMock(ServerRequestInterface::class);
+        $request = $this->createMock(ServerRequestInterface::class);
         $response = $this->createMock(ResponseInterface::class);
-        $uri      = $this->createMock(UriInterface::class);
-        $body     = $this->createMock(StreamInterface::class);
+        $uri = $this->createMock(UriInterface::class);
+        $body = $this->createMock(StreamInterface::class);
 
         $uri
             ->expects($this->exactly(2))
@@ -683,9 +683,9 @@ public function testRouterSetsGroupStrategyOnGroupUriMatchButNoRouteMatch(): voi
 
     public function testRouteStrategyOverridesGlobalStrategy(): void
     {
-        $request  = $this->createMock(ServerRequestInterface::class);
+        $request = $this->createMock(ServerRequestInterface::class);
         $response = $this->createMock(ResponseInterface::class);
-        $uri      = $this->createMock(UriInterface::class);
+        $uri = $this->createMock(UriInterface::class);
 
         $request
             ->expects($this->once())
@@ -705,6 +705,12 @@ public function testRouteStrategyOverridesGlobalStrategy(): void
             ->willReturn($this->createMock(StreamInterface::class))
         ;
 
+        $response
+            ->expects($this->once())
+            ->method('withHeader')
+            ->willReturnSelf()
+        ;
+
         $uri
             ->expects($this->exactly(2))
             ->method('getPath')
@@ -752,6 +758,12 @@ public function testRouteStrategyOverridesGroupStrategy(): void
             ->willReturn($this->createMock(StreamInterface::class))
         ;
 
+        $response
+            ->expects($this->once())
+            ->method('withHeader')
+            ->willReturnSelf()
+        ;
+
         $uri
             ->expects($this->exactly(2))
             ->method('getPath')