diff --git a/src/CachedKeySet.php b/src/CachedKeySet.php
index e2215b30..87f470d7 100644
--- a/src/CachedKeySet.php
+++ b/src/CachedKeySet.php
@@ -146,7 +146,7 @@ private function keyIdExists(string $keyId): bool
             if ($this->rateLimitExceeded()) {
                 return false;
             }
-            $request = $this->httpFactory->createRequest('get', $this->jwksUri);
+            $request = $this->httpFactory->createRequest('GET', $this->jwksUri);
             $jwksResponse = $this->httpClient->sendRequest($request);
             $jwks = (string) $jwksResponse->getBody();
             $this->keySet = JWK::parseKeySet(json_decode($jwks, true), $this->defaultAlg);
diff --git a/tests/CachedKeySetTest.php b/tests/CachedKeySetTest.php
index 1dc2fdc0..73b1213d 100644
--- a/tests/CachedKeySetTest.php
+++ b/tests/CachedKeySetTest.php
@@ -325,7 +325,7 @@ private function getMockHttpFactory(int $timesCalled = 1)
     {
         $request = $this->prophesize('Psr\Http\Message\RequestInterface');
         $factory = $this->prophesize(RequestFactoryInterface::class);
-        $factory->createRequest('get', $this->testJwksUri)
+        $factory->createRequest('GET', $this->testJwksUri)
             ->shouldBeCalledTimes($timesCalled)
             ->willReturn($request->reveal());