diff --git a/source/FluidXml/FluidContext.php b/source/FluidXml/FluidContext.php
index 6f76e41..57b1595 100644
--- a/source/FluidXml/FluidContext.php
+++ b/source/FluidXml/FluidContext.php
@@ -155,7 +155,7 @@ public function __invoke(...$query): FluidContext
                 return $this->query(...$query);
         }
 
-        public function times($times, callable $fn = null): FluidRepeater|static
+        public function times($times, ?callable $fn = null): FluidRepeater|static
         {
                 if ($fn === null) {
                         return new FluidRepeater($this->document, $this->handler, $this, $times);
diff --git a/source/FluidXml/FluidInterface.php b/source/FluidXml/FluidInterface.php
index 0bfc6e4..4ab140a 100644
--- a/source/FluidXml/FluidInterface.php
+++ b/source/FluidXml/FluidInterface.php
@@ -14,7 +14,7 @@ public function html($strip = false);
         public function save($file, $strip = false);
         public function query(...$query);
         public function __invoke(...$query);
-        public function times($times, callable $fn = null);
+        public function times($times, ?callable $fn = null);
         public function each(callable $fn);
         public function map(callable $fn);
         public function filter(callable $fn);
diff --git a/source/FluidXml/FluidXml.php b/source/FluidXml/FluidXml.php
index 1f8b11d..72cb906 100644
--- a/source/FluidXml/FluidXml.php
+++ b/source/FluidXml/FluidXml.php
@@ -207,7 +207,7 @@ protected function namespace_(...$arguments): static
         }
 
         public function query(...$query)                   { return $this->context()->query(...$query); }
-        public function times($times, callable $fn = null) { return $this->context()->times($times, $fn); }
+        public function times($times, ?callable $fn = null) { return $this->context()->times($times, $fn); }
         public function each(callable $fn)                 { return $this->context()->each($fn); }
         public function map(callable $fn)                  { return $this->context()->map($fn); }
         public function filter(callable $fn)               { return $this->context()->filter($fn); }