diff --git a/src/Canducci/ZipCode/Contracts/ZipCodeContract.php b/src/Canducci/ZipCode/Contracts/ZipCodeContract.php
index b1adfcb..65c916d 100644
--- a/src/Canducci/ZipCode/Contracts/ZipCodeContract.php
+++ b/src/Canducci/ZipCode/Contracts/ZipCodeContract.php
@@ -15,5 +15,5 @@ interface ZipCodeContract
      * @return Canducci\ZipCode\ZipCodeInfo
      * @throws Canducci\ZipCode\ZipCodeException
      */
-    public function find(string $value, bool $renew = false): ZipCodeInfo;
+    public function find(string $value, bool $renew = false): ?ZipCodeInfo;
 }
diff --git a/src/Canducci/ZipCode/ZipCode.php b/src/Canducci/ZipCode/ZipCode.php
index b0082bc..f2729f8 100644
--- a/src/Canducci/ZipCode/ZipCode.php
+++ b/src/Canducci/ZipCode/ZipCode.php
@@ -53,7 +53,7 @@ public function __construct(SimpleCacheFilesystem $cache, ZipCodeRequestContract
      * @return Canducci\ZipCode\ZipCodeInfo|ZipCodeInfo|null
      * @throws ZipCodeException
      */
-    public function find(string $value, bool $renew = false): ZipCodeInfo
+    public function find(string $value, bool $renew = false): ?ZipCodeInfo
     {
         $message = '';
         if (is_string($value)) {
@@ -88,7 +88,7 @@ public function find(string $value, bool $renew = false): ZipCodeInfo
     /**
      * @return null|string
      */
-    private function getZipCodeInfo(): string
+    private function getZipCodeInfo(): ?string
     {
         $this->renew();
         if ($this->cache->has('zipcode_' . $this->value)) {