diff --git a/src/Contracts/IsMixedValue.php b/src/Contracts/IsMixedValue.php
index bfc0617..cd4697b 100644
--- a/src/Contracts/IsMixedValue.php
+++ b/src/Contracts/IsMixedValue.php
@@ -4,17 +4,7 @@
 
 namespace Sikessem\Values\Contracts;
 
-use Closure;
-
 interface IsMixedValue
 {
-    public const DEFAULT_VALUE = null;
-
     public function get(): mixed;
-
-    public function set(mixed $value): static;
-
-    public function update(callable|Closure $callback): static;
-
-    public static function from(mixed $value): self;
 }
diff --git a/src/Contracts/IsMutableMixedValue.php b/src/Contracts/IsMutableMixedValue.php
new file mode 100644
index 0000000..bebb826
--- /dev/null
+++ b/src/Contracts/IsMutableMixedValue.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sikessem\Values\Contracts;
+
+use Closure;
+
+interface IsMutableMixedValue extends IsMixedValue
+{
+    public const DEFAULT_VALUE = null;
+
+    public function set(mixed $value): static;
+
+    public function update(callable|Closure $callback): static;
+
+    public static function from(mixed $value): self;
+}
diff --git a/src/MixedValue.php b/src/MixedValue.php
index 63455cd..1ca55e8 100644
--- a/src/MixedValue.php
+++ b/src/MixedValue.php
@@ -4,41 +4,14 @@
 
 namespace Sikessem\Values;
 
-use Closure;
 use Sikessem\Values\Contracts\IsMixedValue;
 
 class MixedValue implements IsMixedValue
 {
-    protected mixed $value = self::DEFAULT_VALUE;
-
-    public function __construct(mixed $value = self::DEFAULT_VALUE)
-    {
-        $this->set($value);
-    }
+    protected mixed $value;
 
     public function get(): mixed
     {
         return $this->value;
     }
-
-    public function set(mixed $value): static
-    {
-        $this->value = $value;
-
-        return $this;
-    }
-
-    public function update(callable|Closure $callback): static
-    {
-        return $this->set($callback($this->get()));
-    }
-
-    public static function from(mixed $value): self
-    {
-        if ($value instanceof self) {
-            return $value;
-        }
-
-        return new self($value);
-    }
 }
diff --git a/src/MutableMixedValue.php b/src/MutableMixedValue.php
new file mode 100644
index 0000000..a8fa423
--- /dev/null
+++ b/src/MutableMixedValue.php
@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sikessem\Values;
+
+use Closure;
+use Sikessem\Values\Contracts\IsMutableMixedValue;
+
+class MutableMixedValue extends MixedValue implements IsMutableMixedValue
+{
+    protected mixed $value = self::DEFAULT_VALUE;
+
+    public function __construct(mixed $value = self::DEFAULT_VALUE)
+    {
+        $this->set($value);
+    }
+
+    public function set(mixed $value): static
+    {
+        $this->value = $value;
+
+        return $this;
+    }
+
+    public function update(callable|Closure $callback): static
+    {
+        return $this->set($callback($this->get()));
+    }
+
+    public static function from(mixed $value): self
+    {
+        if ($value instanceof self) {
+            return $value;
+        }
+
+        return new self($value);
+    }
+}
diff --git a/tests/Feat/MixedValueTest.php b/tests/Feat/MutableMixedValueTest.php
similarity index 65%
rename from tests/Feat/MixedValueTest.php
rename to tests/Feat/MutableMixedValueTest.php
index 1e76f87..bb61c4b 100644
--- a/tests/Feat/MixedValueTest.php
+++ b/tests/Feat/MutableMixedValueTest.php
@@ -2,10 +2,10 @@
 
 declare(strict_types=1);
 
-use Sikessem\Values\MixedValue;
+use Sikessem\Values\MutableMixedValue;
 
 it('should work', function () {
-    $val = MixedValue::from('Hello World');
+    $val = MutableMixedValue::from('Hello World');
     $val->update(fn (string $data) => "{$data}!");
     expect($val->get())->toBe('Hello World!');
 });