diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d04ea35..5cd5e5b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,11 +13,11 @@ jobs:
     strategy:
       matrix:
         operating-system: ['ubuntu-latest']
-        php-versions: ['8.1']
+        php-versions: ['8.1', '8.2', '8.3']
         phpunit-versions: ['latest']
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
diff --git a/composer.json b/composer.json
index 69fea3c..06ce517 100644
--- a/composer.json
+++ b/composer.json
@@ -27,10 +27,10 @@
     "paragonie/constant_time_encoding": ">= 2.6",
     "paragonie/corner": "^2",
     "paragonie/easy-ecc": "^1",
-    "paragonie/sodium_compat": "^1.17"
+    "paragonie/sodium_compat": "^1|^2"
   },
   "require-dev": {
-    "phpunit/phpunit": "^9|^10",
+    "phpunit/phpunit": "^9",
     "vimeo/psalm": "^4|^5"
   },
   "scripts": {
diff --git a/src/Keys/Version3/SymmetricKey.php b/src/Keys/Version3/SymmetricKey.php
index f634ea3..cc55e1f 100644
--- a/src/Keys/Version3/SymmetricKey.php
+++ b/src/Keys/Version3/SymmetricKey.php
@@ -21,6 +21,6 @@ class SymmetricKey extends BaseSymmetricKey
     public function __construct(
         string $keyMaterial
     ) {
-        return parent::__construct($keyMaterial, new Version3());
+        parent::__construct($keyMaterial, new Version3());
     }
 }
diff --git a/src/Keys/Version4/SymmetricKey.php b/src/Keys/Version4/SymmetricKey.php
index 04e1b3f..f1847d6 100644
--- a/src/Keys/Version4/SymmetricKey.php
+++ b/src/Keys/Version4/SymmetricKey.php
@@ -19,6 +19,6 @@ class SymmetricKey extends BaseSymmetricKey
     public function __construct(
         string $keyMaterial
     ) {
-        return parent::__construct($keyMaterial, new Version4());
+        parent::__construct($keyMaterial, new Version4());
     }
 }
diff --git a/src/Rules/FooterJSON.php b/src/Rules/FooterJSON.php
index d0c4e3c..4ec57f1 100644
--- a/src/Rules/FooterJSON.php
+++ b/src/Rules/FooterJSON.php
@@ -100,6 +100,7 @@ public function isValid(JsonToken $token): bool
 
         /** @var array|bool|null $decoded */
         $decoded = json_decode($json, true, $this->maxDepth);
+        /** @psalm-suppress RiskyTruthyFalsyComparison */
         if (!$decoded) {
             $this->rejectReason = json_last_error_msg();
         }
diff --git a/src/Util.php b/src/Util.php
index 2f26b6b..4c58cea 100644
--- a/src/Util.php
+++ b/src/Util.php
@@ -55,12 +55,14 @@ public static function calculateJsonDepth(string $json): int
 
         $previous = '';
         $depth = 1;
+        /** @psalm-suppress RiskyTruthyFalsyComparison */
         while (!empty($stripped) && $stripped !== $previous) {
             $previous = $stripped;
             // Remove pairs of tokens
             $stripped = str_replace(['[]', '{}'], [], $stripped);
             ++$depth;
         }
+        /** @psalm-suppress RiskyTruthyFalsyComparison */
         if (!empty($stripped)) {
             throw new EncodingException(
                 'Invalid JSON string provided',
diff --git a/tests/ExceptionHelpfulTest.php b/tests/ExceptionHelpfulTest.php
index d3a72e7..b521b8d 100644
--- a/tests/ExceptionHelpfulTest.php
+++ b/tests/ExceptionHelpfulTest.php
@@ -19,7 +19,7 @@ private function generateException(int $code): void
         throw new PasetoException('Test', $code);
     }
 
-    public function codeProvider(): array
+    public static function codeProvider(): array
     {
         return [
             [ExceptionCode::BAD_VERSION],