diff --git a/.github/workflows/pr-tests.yaml b/.github/workflows/pr-tests.yaml
index 0c1fb9a..21212bf 100644
--- a/.github/workflows/pr-tests.yaml
+++ b/.github/workflows/pr-tests.yaml
@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-version: ['7.2', '7.3', '7.4', '8.0']
+        php-version: ['8.0', '8.2']
 
     steps:
     - uses: actions/checkout@v2
diff --git a/composer.json b/composer.json
index 2aaf931..c2d5d41 100644
--- a/composer.json
+++ b/composer.json
@@ -5,7 +5,7 @@
     "type": "library",
     "license": "MIT",
     "require": {
-        "php": "^7.2 || ^8.0",
+        "php": "^8.0",
         "zumba/symbiosis": "^3.0"
     },
     "require-dev": {
diff --git a/src/Query/Response/Iterator.php b/src/Query/Response/Iterator.php
index f5f2095..8efa508 100644
--- a/src/Query/Response/Iterator.php
+++ b/src/Query/Response/Iterator.php
@@ -114,7 +114,7 @@ public function count(): int
      * @return mixed
      * @see \Iterator
      */
-    public function current()
+    public function current(): mixed
     {
         return $this->data->current();
     }
@@ -125,7 +125,7 @@ public function current()
      * @return mixed (scalar)
      * @see \Iterator
      */
-    public function key()
+    public function key(): mixed
     {
         return $this->data->key();
     }
diff --git a/src/Query/Response/Map.php b/src/Query/Response/Map.php
index c7e283a..2541d1d 100644
--- a/src/Query/Response/Map.php
+++ b/src/Query/Response/Map.php
@@ -67,7 +67,7 @@ public function offsetExists($offset): bool
      * @return mixed
      * @see \ArrayAccess
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         return $this->data[$offset] ?? null;
     }
diff --git a/src/Query/Response/Scalar.php b/src/Query/Response/Scalar.php
index eeae6a4..9db2aec 100644
--- a/src/Query/Response/Scalar.php
+++ b/src/Query/Response/Scalar.php
@@ -40,7 +40,7 @@ protected static function from($value): Scalar
      *
      * @return mixed any scalar value (integer|float|string|boolean)
      */
-    public function value()
+    public function value(): mixed
     {
         return $this->value;
     }
@@ -51,7 +51,7 @@ public function value()
      * @see \JsonSerializable
      * @return mixed
      */
-    public function jsonSerialize()
+    public function jsonSerialize(): mixed
     {
         return $this->value;
     }