diff --git a/src/VCR/Storage/AbstractStorage.php b/src/VCR/Storage/AbstractStorage.php
index e3658bb30..971fe0c57 100644
--- a/src/VCR/Storage/AbstractStorage.php
+++ b/src/VCR/Storage/AbstractStorage.php
@@ -68,7 +68,7 @@ public function __construct(string $cassettePath, string $cassetteName, string $
      *
      * @return array<string,mixed>|null parsed current record
      */
-    public function current()
+    public function current(): mixed
     {
         return $this->current;
     }
diff --git a/src/VCR/Storage/Blackhole.php b/src/VCR/Storage/Blackhole.php
index b413fe2af..09e8ac2d9 100644
--- a/src/VCR/Storage/Blackhole.php
+++ b/src/VCR/Storage/Blackhole.php
@@ -35,10 +35,9 @@ public function key(): int
         throw new \BadMethodCallException('Not implemented');
     }
 
-    /** @return array<mixed>|null */
-    public function next(): ?array
+    /** @return void */
+    public function next(): void
     {
-        return null;
     }
 
     public function rewind(): void
diff --git a/src/VCR/Storage/Yaml.php b/src/VCR/Storage/Yaml.php
index ed6be615b..f033d392e 100644
--- a/src/VCR/Storage/Yaml.php
+++ b/src/VCR/Storage/Yaml.php
@@ -88,7 +88,7 @@ public function rewind(): void
         $this->position = 0;
     }
 
-    public function valid()
+    public function valid(): bool
     {
         if (null === $this->current) {
             $this->next();
diff --git a/tests/Unit/Storage/AbstractStorageTest.php b/tests/Unit/Storage/AbstractStorageTest.php
index 413a11050..5ed4ad188 100644
--- a/tests/Unit/Storage/AbstractStorageTest.php
+++ b/tests/Unit/Storage/AbstractStorageTest.php
@@ -51,7 +51,7 @@ public function next(): void
     {
     }
 
-    public function valid()
+    public function valid(): bool
     {
         return (bool) $this->position;
     }