diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index 702ce63b..d7e25b59 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         php: ['7.4', '8.0', '8.1', '8.2']
-        symfony: ['4.4.*', '5.4.*', '6.0.*', '6.1.*', '6.2.*', '6.3.*']
+        symfony: ['4.4.*', '5.4.*', '6.0.*', '6.1.*', '6.2.*', '6.3.*', '6.4.*', '7.0.*']
         composer-flags: ['--prefer-stable']
         can-fail: [false]
         extensions: ['curl, iconv, mbstring, mongodb, pdo, pdo_sqlite, sqlite, zip']
@@ -29,18 +29,28 @@ jobs:
             symfony: '6.2.*'
           - php: '7.4'
             symfony: '6.3.*'
+          - php: '7.4'
+            symfony: '6.4.*'
+          - php: '7.4'
+            symfony: '7.0.*'
           - php: '8.0'
             symfony: '6.1.*'
           - php: '8.0'
             symfony: '6.2.*'
           - php: '8.0'
             symfony: '6.3.*'
+          - php: '8.0'
+            symfony: '6.4.*'
+          - php: '8.0'
+            symfony: '7.0.*'
+          - php: '8.1'
+            symfony: '7.0.*'
 
     name: "PHP ${{ matrix.php }} - Symfony ${{ matrix.symfony }}${{ matrix.composer-flags != '' && format(' - Composer {0}', matrix.composer-flags) || '' }}"
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Cache dependencies
         uses: actions/cache@v3
@@ -63,8 +73,8 @@ jobs:
           version: '5.0'
           topology: server
 
-      - name: Remove Guard
-        if: contains(fromJSON('["6.0.*", "6.1.*", "6.2.*", "6.3.*"]'), matrix.symfony)
+      - name: Remove Guard (Symfony >=6.0)
+        if: contains(fromJSON('["6.0.*", "6.1.*", "6.2.*", "6.3.*", "6.4.*", "7.0.*"]'), matrix.symfony)
         run: composer remove --dev --no-update symfony/security-guard
 
       - name: Install dependencies
diff --git a/Security/Exception/InvalidTokenException.php b/Security/Exception/InvalidTokenException.php
index 6aa8129a..fec95dad 100644
--- a/Security/Exception/InvalidTokenException.php
+++ b/Security/Exception/InvalidTokenException.php
@@ -15,10 +15,7 @@
 
 class InvalidTokenException extends AuthenticationException
 {
-    /**
-     * @return string
-     */
-    public function getMessageKey()
+    public function getMessageKey(): string
     {
         return 'Invalid JWT Refresh Token';
     }
diff --git a/Security/Exception/MissingTokenException.php b/Security/Exception/MissingTokenException.php
index 409385ee..2c63c4d8 100644
--- a/Security/Exception/MissingTokenException.php
+++ b/Security/Exception/MissingTokenException.php
@@ -15,10 +15,7 @@
 
 class MissingTokenException extends AuthenticationException
 {
-    /**
-     * @return string
-     */
-    public function getMessageKey()
+    public function getMessageKey(): string
     {
         return 'Missing JWT Refresh Token';
     }
diff --git a/Security/Exception/TokenNotFoundException.php b/Security/Exception/TokenNotFoundException.php
index 519cb17b..5d4834f3 100644
--- a/Security/Exception/TokenNotFoundException.php
+++ b/Security/Exception/TokenNotFoundException.php
@@ -15,10 +15,7 @@
 
 class TokenNotFoundException extends AuthenticationException
 {
-    /**
-     * @return string
-     */
-    public function getMessageKey()
+    public function getMessageKey(): string
     {
         return 'JWT Refresh Token Not Found';
     }
diff --git a/Tests/Unit/EventListener/AttachRefreshTokenOnSuccessListenerTest.php b/Tests/Unit/EventListener/AttachRefreshTokenOnSuccessListenerTest.php
index a71e15f9..7b8e898d 100644
--- a/Tests/Unit/EventListener/AttachRefreshTokenOnSuccessListenerTest.php
+++ b/Tests/Unit/EventListener/AttachRefreshTokenOnSuccessListenerTest.php
@@ -298,6 +298,10 @@ public function testAttachesTheTokenToTheResponseBodyOnCredentialsAuth()
 
     public function testDoesNothingWhenThereIsNotAUser()
     {
+        if ((new \ReflectionClass(AuthenticationSuccessEvent::class))->getMethod('getUser')->hasReturnType()) {
+            $this->markTestSkipped(sprintf('%s::getUser() has a non-nullable return type in LexikJWTAuthenticationBundle 3.x', AuthenticationSuccessEvent::class));
+        }
+
         /** @var AuthenticationSuccessEvent|MockObject $event */
         $event = $this->createMock(AuthenticationSuccessEvent::class);
 
diff --git a/composer.json b/composer.json
index 258beeba..141d9b03 100644
--- a/composer.json
+++ b/composer.json
@@ -34,11 +34,11 @@
     "doctrine/cache": "^1.11|^2.0",
     "doctrine/mongodb-odm": "^2.2",
     "doctrine/orm": "^2.7",
-    "matthiasnoback/symfony-config-test": "^4.2",
-    "matthiasnoback/symfony-dependency-injection-test": "^4.2",
+    "matthiasnoback/symfony-config-test": "^4.2|^5.0",
+    "matthiasnoback/symfony-dependency-injection-test": "^4.2|^5.0",
     "phpunit/phpunit": "^9.5",
     "symfony/cache": "^4.4|^5.4|^6.0|^7.0",
-    "symfony/security-guard": "^4.4|^5.4|^6.0|^7.0"
+    "symfony/security-guard": "^4.4|^5.4"
   },
   "conflict": {
     "doctrine/mongodb-odm": "<2.2",