diff --git a/.travis.yml b/.travis.yml
index 21f3e926..85474626 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,11 @@ sudo: false
 
 cache:
   directories:
-  - vendor
+    - vendor
+
+env:
+  - DEPENDENCIES=""
+  - DEPENDENCIES="--prefer-lowest --prefer-stable"
 
 php:
   - 7.0
@@ -12,7 +16,7 @@ php:
   - 7.2
 
 install:
-  - travis_retry composer install --no-interaction --prefer-source
+  - composer update --no-interaction --prefer-dist $DEPENDENCIES
 
 script:
   - vendor/bin/phpunit
diff --git a/composer.json b/composer.json
index 814d7054..8e7fd7e6 100644
--- a/composer.json
+++ b/composer.json
@@ -7,16 +7,17 @@
         "php": ">=7.0.0",
         "ext-openssl": "*",
         "league/event": "^2.1",
-        "lcobucci/jwt": "^3.1",
+        "lcobucci/jwt": "^3.2.2",
         "paragonie/random_compat": "^2.0",
-        "psr/http-message": "^1.0",
+        "psr/http-message": "^1.0.1",
         "defuse/php-encryption": "^2.1"
     },
     "require-dev": {
         "phpunit/phpunit": "^6.3 || ^7.0",
-        "zendframework/zend-diactoros": "^1.0",
+        "zendframework/zend-diactoros": "^1.3.2",
         "phpstan/phpstan": "^0.9.2",
-        "phpstan/phpstan-phpunit": "^0.9.4"
+        "phpstan/phpstan-phpunit": "^0.9.4",
+        "phpstan/phpstan-strict-rules": "^0.9.0"
     },
     "repositories": [
         {
diff --git a/phpstan.neon b/phpstan.neon
index a4800dd5..88c21d40 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -2,8 +2,4 @@ includes:
 	- vendor/phpstan/phpstan-phpunit/extension.neon
 	- vendor/phpstan/phpstan-phpunit/rules.neon
 	- vendor/phpstan/phpstan-phpunit/strictRules.neon
-parameters:
-	ignoreErrors:
-		- '#Class Zend\\Diactoros\\ServerRequest constructor invoked with \d+ parameters, 0-6 required#'
-		- '#Parameter \#2 \$key of method Lcobucci\\JWT\\Builder::sign\(\) expects string, Lcobucci\\JWT\\Signer\\Key given#'
-	reportUnmatchedIgnoredErrors: false
+	- vendor/phpstan/phpstan-strict-rules/rules.neon
diff --git a/src/Exception/OAuthServerException.php b/src/Exception/OAuthServerException.php
index 281eae0e..97fc142e 100644
--- a/src/Exception/OAuthServerException.php
+++ b/src/Exception/OAuthServerException.php
@@ -262,13 +262,10 @@ class OAuthServerException extends \Exception
                 $this->redirectUri .= (strstr($this->redirectUri, '?') === false) ? '?' : '&';
             }
 
-            /** @var ResponseInterface $response */
-            $response = $response->withStatus(302)->withHeader('Location', $this->redirectUri . http_build_query($payload));
-            return $response;
+            return $response->withStatus(302)->withHeader('Location', $this->redirectUri . http_build_query($payload));
         }
 
         foreach ($headers as $header => $content) {
-            /** @var ResponseInterface $response */
             $response = $response->withHeader($header, $content);
         }
 
diff --git a/src/Grant/AbstractGrant.php b/src/Grant/AbstractGrant.php
index e806ba09..304ba99b 100644
--- a/src/Grant/AbstractGrant.php
+++ b/src/Grant/AbstractGrant.php
@@ -204,7 +204,7 @@ abstract class AbstractGrant implements GrantTypeInterface
                 throw OAuthServerException::invalidClient();
             } elseif (
                 is_array($client->getRedirectUri())
-                && in_array($redirectUri, $client->getRedirectUri()) === false
+                && in_array($redirectUri, $client->getRedirectUri(), true) === false
             ) {
                 $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
                 throw OAuthServerException::invalidClient();
diff --git a/src/Grant/AuthCodeGrant.php b/src/Grant/AuthCodeGrant.php
index d7900581..dc880365 100644
--- a/src/Grant/AuthCodeGrant.php
+++ b/src/Grant/AuthCodeGrant.php
@@ -235,13 +235,13 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
                 throw OAuthServerException::invalidClient();
             } elseif (
                 is_array($client->getRedirectUri())
-                && in_array($redirectUri, $client->getRedirectUri()) === false
+                && in_array($redirectUri, $client->getRedirectUri(), true) === false
             ) {
                 $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
                 throw OAuthServerException::invalidClient();
             }
-	} elseif (is_array($client->getRedirectUri()) && count($client->getRedirectUri()) !== 1
-	    || empty($client->getRedirectUri())) {
+        } elseif (is_array($client->getRedirectUri()) && count($client->getRedirectUri()) !== 1
+            || empty($client->getRedirectUri())) {
             $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
             throw OAuthServerException::invalidClient();
         } else {
@@ -278,7 +278,7 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
             }
 
             $codeChallengeMethod = $this->getQueryStringParameter('code_challenge_method', $request, 'plain');
-            if (in_array($codeChallengeMethod, ['plain', 'S256']) === false) {
+            if (in_array($codeChallengeMethod, ['plain', 'S256'], true) === false) {
                 throw OAuthServerException::invalidRequest(
                     'code_challenge_method',
                     'Code challenge method must be `plain` or `S256`'
diff --git a/src/Grant/ImplicitGrant.php b/src/Grant/ImplicitGrant.php
index 5a6fccb1..dfb96743 100644
--- a/src/Grant/ImplicitGrant.php
+++ b/src/Grant/ImplicitGrant.php
@@ -144,12 +144,12 @@ class ImplicitGrant extends AbstractAuthorizeGrant
                 throw OAuthServerException::invalidClient();
             } elseif (
                 is_array($client->getRedirectUri())
-                && in_array($redirectUri, $client->getRedirectUri()) === false
+                && in_array($redirectUri, $client->getRedirectUri(), true) === false
             ) {
                 $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
                 throw OAuthServerException::invalidClient();
             }
-	} elseif (is_array($client->getRedirectUri()) && count($client->getRedirectUri()) !== 1
+        } elseif (is_array($client->getRedirectUri()) && count($client->getRedirectUri()) !== 1
             || empty($client->getRedirectUri())) {
             $this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
             throw OAuthServerException::invalidClient();
diff --git a/src/Grant/RefreshTokenGrant.php b/src/Grant/RefreshTokenGrant.php
index 66a3b266..f8e022b4 100644
--- a/src/Grant/RefreshTokenGrant.php
+++ b/src/Grant/RefreshTokenGrant.php
@@ -11,7 +11,6 @@
 
 namespace League\OAuth2\Server\Grant;
 
-use League\OAuth2\Server\Entities\ScopeEntityInterface;
 use League\OAuth2\Server\Exception\OAuthServerException;
 use League\OAuth2\Server\Repositories\RefreshTokenRepositoryInterface;
 use League\OAuth2\Server\RequestEvent;
@@ -53,7 +52,7 @@ class RefreshTokenGrant extends AbstractGrant
         // The OAuth spec says that a refreshed access token can have the original scopes or fewer so ensure
         // the request doesn't include any new scopes
         foreach ($scopes as $scope) {
-            if (in_array($scope->getIdentifier(), $oldRefreshToken['scopes']) === false) {
+            if (in_array($scope->getIdentifier(), $oldRefreshToken['scopes'], true) === false) {
                 throw OAuthServerException::invalidScope($scope->getIdentifier());
             }
         }
diff --git a/src/ResponseTypes/RedirectResponse.php b/src/ResponseTypes/RedirectResponse.php
index f40f087b..e4639148 100644
--- a/src/ResponseTypes/RedirectResponse.php
+++ b/src/ResponseTypes/RedirectResponse.php
@@ -35,8 +35,6 @@ class RedirectResponse extends AbstractResponseType
      */
     public function generateHttpResponse(ResponseInterface $response)
     {
-        /** @var ResponseInterface $response */
-        $response = $response->withStatus(302)->withHeader('Location', $this->redirectUri);
-        return $response;
+        return $response->withStatus(302)->withHeader('Location', $this->redirectUri);
     }
 }