diff --git a/composer.json b/composer.json
index 650778d..e08783f 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
         "friendsofphp/php-cs-fixer": "^2.16",
         "roave/security-advisories": "dev-master",
         "squizlabs/php_codesniffer": "^3.5",
-        "vimeo/psalm": "^4.3"
+        "vimeo/psalm": "dev-master"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/Psl/Password/algorithms.php b/src/Psl/Password/algorithms.php
index 6f02e2a..1b8d613 100644
--- a/src/Psl/Password/algorithms.php
+++ b/src/Psl/Password/algorithms.php
@@ -14,8 +14,8 @@ namespace Psl\Password;
 function algorithms(): array
 {
     return [
-        (string) BCRYPT_ALGORITHM,
-        (string) ARGON2I_ALGORITHM,
-        (string) ARGON2ID_ALGORITHM,
+        BCRYPT_ALGORITHM,
+        ARGON2I_ALGORITHM,
+        ARGON2ID_ALGORITHM,
     ];
 }
diff --git a/src/Psl/Password/get_information.php b/src/Psl/Password/get_information.php
index f013834..c2f50a1 100644
--- a/src/Psl/Password/get_information.php
+++ b/src/Psl/Password/get_information.php
@@ -23,8 +23,9 @@ use function password_get_info;
  */
 function get_information(string $hash): array
 {
+    /** @var array{algoName: string, options: array<string, array-key>} $information */
     $information = password_get_info($hash);
-    $algorithm   = (string)$information['algoName'];
+    $algorithm   = $information['algoName'];
     if (BCRYPT_ALGORITHM === $algorithm) {
         return [
             'algorithm' => $algorithm,