diff --git a/src/Grant/AbstractGrant.php b/src/Grant/AbstractGrant.php
index 6a9390f3..7fe30e5f 100644
--- a/src/Grant/AbstractGrant.php
+++ b/src/Grant/AbstractGrant.php
@@ -11,7 +11,6 @@
 namespace League\OAuth2\Server\Grant;
 
 use League\Event\EmitterAwareTrait;
-use League\Event\EmitterInterface;
 use League\Event\Event;
 use League\OAuth2\Server\Entities\AccessTokenEntity;
 use League\OAuth2\Server\Entities\AuthCodeEntity;
@@ -24,6 +23,7 @@ use League\OAuth2\Server\Repositories\AuthCodeRepositoryInterface;
 use League\OAuth2\Server\Repositories\ClientRepositoryInterface;
 use League\OAuth2\Server\Repositories\RefreshTokenRepositoryInterface;
 use League\OAuth2\Server\Repositories\ScopeRepositoryInterface;
+use League\OAuth2\Server\Repositories\UserRepositoryInterface;
 use Psr\Http\Message\ServerRequestInterface;
 
 /**
@@ -58,12 +58,17 @@ abstract class AbstractGrant implements GrantTypeInterface
     /**
      * @var \League\OAuth2\Server\Repositories\AuthCodeRepositoryInterface
      */
-    private $authCodeRepository;
+    protected $authCodeRepository;
 
     /**
      * @var \League\OAuth2\Server\Repositories\RefreshTokenRepositoryInterface
      */
-    private $refreshTokenRepository;
+    protected $refreshTokenRepository;
+
+    /**
+     * @var \League\OAuth2\Server\Repositories\UserRepositoryInterface
+     */
+    protected $userRepository;
 
     /**
      * @var string
@@ -120,6 +125,14 @@ abstract class AbstractGrant implements GrantTypeInterface
         $this->authCodeRepository = $authCodeRepository;
     }
 
+    /**
+     * @param \League\OAuth2\Server\Repositories\UserRepositoryInterface $userRepository
+     */
+    public function setUserRepository(UserRepositoryInterface $userRepository)
+    {
+        $this->userRepository = $userRepository;
+    }
+
     /**
      * @param string $pathToPrivateKey
      */
@@ -136,14 +149,6 @@ abstract class AbstractGrant implements GrantTypeInterface
         $this->pathToPublicKey = $pathToPublicKey;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function setEmitter(EmitterInterface $emitter = null)
-    {
-        $this->emitter = $emitter;
-    }
-
     /**
      * {@inheritdoc}
      */
@@ -152,22 +157,6 @@ abstract class AbstractGrant implements GrantTypeInterface
         $this->refreshTokenTTL = $refreshTokenTTL;
     }
 
-    /**
-     * @return AuthCodeRepositoryInterface
-     */
-    protected function getAuthCodeRepository()
-    {
-        return $this->authCodeRepository;
-    }
-
-    /**
-     * @return RefreshTokenRepositoryInterface
-     */
-    protected function getRefreshTokenRepository()
-    {
-        return $this->refreshTokenRepository;
-    }
-
     /**
      * Validate the client.
      *
diff --git a/src/Grant/AuthCodeGrant.php b/src/Grant/AuthCodeGrant.php
index bc65dc9a..f1db4921 100644
--- a/src/Grant/AuthCodeGrant.php
+++ b/src/Grant/AuthCodeGrant.php
@@ -24,11 +24,6 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
      */
     private $authCodeTTL;
 
-    /**
-     * @var \League\OAuth2\Server\Repositories\UserRepositoryInterface
-     */
-    private $userRepository;
-
     /**
      * @param \League\OAuth2\Server\Repositories\AuthCodeRepositoryInterface     $authCodeRepository
      * @param \League\OAuth2\Server\Repositories\RefreshTokenRepositoryInterface $refreshTokenRepository
@@ -49,7 +44,7 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
     ) {
         $this->setAuthCodeRepository($authCodeRepository);
         $this->setRefreshTokenRepository($refreshTokenRepository);
-        $this->userRepository = $userRepository;
+        $this->setUserRepository($userRepository);
         $this->authCodeTTL = $authCodeTTL;
         $this->refreshTokenTTL = new \DateInterval('P1M');
         $this->loginTemplate = $loginTemplate;
@@ -262,7 +257,7 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
                 throw OAuthServerException::invalidRequest('code', 'Authorization code has expired');
             }
 
-            if ($this->getAuthCodeRepository()->isAuthCodeRevoked($authCodePayload->auth_code_id) === true) {
+            if ($this->authCodeRepository->isAuthCodeRevoked($authCodePayload->auth_code_id) === true) {
                 throw OAuthServerException::invalidRequest('code', 'Authorization code has been revoked');
             }
 
diff --git a/src/Grant/ImplicitGrant.php b/src/Grant/ImplicitGrant.php
index 7f846f90..4e306d76 100644
--- a/src/Grant/ImplicitGrant.php
+++ b/src/Grant/ImplicitGrant.php
@@ -16,11 +16,6 @@ use Zend\Diactoros\Uri;
 
 class ImplicitGrant extends AbstractAuthorizeGrant
 {
-    /**
-     * @var \League\OAuth2\Server\Repositories\UserRepositoryInterface
-     */
-    private $userRepository;
-
     /**
      * @param \League\OAuth2\Server\Repositories\UserRepositoryInterface    $userRepository
      * @param string|null                                                   $loginTemplate
@@ -33,7 +28,7 @@ class ImplicitGrant extends AbstractAuthorizeGrant
         $authorizeTemplate = null,
         RendererInterface $templateRenderer = null
     ) {
-        $this->userRepository = $userRepository;
+        $this->setUserRepository($userRepository);
         $this->refreshTokenTTL = new \DateInterval('P1M');
         $this->loginTemplate = $loginTemplate;
         $this->authorizeTemplate = $authorizeTemplate;
diff --git a/src/Grant/PasswordGrant.php b/src/Grant/PasswordGrant.php
index d7328f71..f9298722 100644
--- a/src/Grant/PasswordGrant.php
+++ b/src/Grant/PasswordGrant.php
@@ -23,11 +23,6 @@ use Psr\Http\Message\ServerRequestInterface;
  */
 class PasswordGrant extends AbstractGrant
 {
-    /**
-     * @var \League\OAuth2\Server\Repositories\UserRepositoryInterface
-     */
-    private $userRepository;
-
     /**
      * @param \League\OAuth2\Server\Repositories\UserRepositoryInterface         $userRepository
      * @param \League\OAuth2\Server\Repositories\RefreshTokenRepositoryInterface $refreshTokenRepository
@@ -36,7 +31,7 @@ class PasswordGrant extends AbstractGrant
         UserRepositoryInterface $userRepository,
         RefreshTokenRepositoryInterface $refreshTokenRepository
     ) {
-        $this->userRepository = $userRepository;
+        $this->setUserRepository($userRepository);
         $this->setRefreshTokenRepository($refreshTokenRepository);
 
         $this->refreshTokenTTL = new \DateInterval('P1M');
diff --git a/src/Grant/RefreshTokenGrant.php b/src/Grant/RefreshTokenGrant.php
index f1aebd3d..04d078e4 100644
--- a/src/Grant/RefreshTokenGrant.php
+++ b/src/Grant/RefreshTokenGrant.php
@@ -74,13 +74,13 @@ class RefreshTokenGrant extends AbstractGrant
 
         // Expire old tokens
         $this->accessTokenRepository->revokeAccessToken($oldRefreshToken['access_token_id']);
-        $this->getRefreshTokenRepository()->revokeRefreshToken($oldRefreshToken['refresh_token_id']);
+        $this->refreshTokenRepository->revokeRefreshToken($oldRefreshToken['refresh_token_id']);
 
         // Issue and persist new tokens
         $accessToken = $this->issueAccessToken($accessTokenTTL, $client, $oldRefreshToken['user_id'], $scopes);
         $refreshToken = $this->issueRefreshToken($accessToken);
         $this->accessTokenRepository->persistNewAccessToken($accessToken);
-        $this->getRefreshTokenRepository()->persistNewRefreshToken($refreshToken);
+        $this->refreshTokenRepository->persistNewRefreshToken($refreshToken);
 
         // Inject tokens into response
         $responseType->setAccessToken($accessToken);
@@ -126,7 +126,7 @@ class RefreshTokenGrant extends AbstractGrant
             throw OAuthServerException::invalidRefreshToken('Token has expired');
         }
 
-        if ($this->getRefreshTokenRepository()->isRefreshTokenRevoked($refreshTokenData['refresh_token_id']) === true) {
+        if ($this->refreshTokenRepository->isRefreshTokenRevoked($refreshTokenData['refresh_token_id']) === true) {
             throw OAuthServerException::invalidRefreshToken('Token has been revoked');
         }