diff --git a/src/Archive7z.php b/src/Archive7z.php
index 0a81863..c9e91d3 100644
--- a/src/Archive7z.php
+++ b/src/Archive7z.php
@@ -91,7 +91,7 @@ class Archive7z
      *
      * @throws Exception
      */
-    public function __construct(string $filename, string $binary7z = null, ?float $timeout = 60.0)
+    public function __construct(string $filename, ?string $binary7z = null, ?float $timeout = 60.0)
     {
         $this->filename = $filename;
         $this->timeout = $timeout;
@@ -103,7 +103,7 @@ public function __construct(string $filename, string $binary7z = null, ?float $t
      *
      * @throws Exception
      */
-    public static function get7zipInformation(string $binary7z = null): string
+    public static function get7zipInformation(?string $binary7z = null): string
     {
         $binary7z ??= static::makeBinary7z($binary7z);
 
@@ -339,7 +339,7 @@ public function getEntry(string $path): ?Entry
      *
      * @return Entry[]
      */
-    public function getEntries(string $pathMask = null, int $limit = null): array
+    public function getEntries(?string $pathMask = null, ?int $limit = null): array
     {
         $process = $this->makeProcess('l', \array_merge(
             ['-slt'],
diff --git a/src/Archive7zTrait.php b/src/Archive7zTrait.php
index 82d0988..c101c04 100644
--- a/src/Archive7zTrait.php
+++ b/src/Archive7zTrait.php
@@ -48,7 +48,7 @@ protected static function getAutoBinary7z(): ?string
     /**
      * @throws Exception
      */
-    protected static function makeBinary7z(string $binary7z = null): string
+    protected static function makeBinary7z(?string $binary7z = null): string
     {
         if (null === $binary7z) {
             $binary7z = static::getAutoBinary7z();
diff --git a/src/Parser.php b/src/Parser.php
index fb54d1f..ddf5d87 100644
--- a/src/Parser.php
+++ b/src/Parser.php
@@ -87,7 +87,7 @@ public function parseHeader(): array
     /**
      * @return array<int, array<string, string|string[]>>
      */
-    public function parseEntries(int $limit = null): array
+    public function parseEntries(?int $limit = null): array
     {
         $isHead = true;
         $list = [];