diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1b5084f4..6594e5d7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,7 +19,7 @@ jobs:
         strategy:
             matrix:
                 php-version:
-                    - '7.3'
+                    - '7.4'
 
         steps:
             -
@@ -52,7 +52,7 @@ jobs:
         strategy:
             matrix:
                 php-version:
-                    - '7.3'
+                    - '7.4'
 
         steps:
             -
@@ -85,7 +85,6 @@ jobs:
         strategy:
             matrix:
                 php-version:
-                    - '7.3'
                     - '7.4'
                     - '8.0'
 
diff --git a/lib/Definition.php b/lib/Definition.php
index ea434bcb..048c90a8 100644
--- a/lib/Definition.php
+++ b/lib/Definition.php
@@ -24,6 +24,11 @@ class Definition
      */
     private $types;
 
+    /**
+     * @var array<mixed>
+     */
+    private array $enum = [];
+
     /**
      * @var string|null
      */
@@ -32,14 +37,16 @@ class Definition
     /**
      * @param mixed $defaultValue
      * @param array<string> $types
+     * @param array<mixed> $enum
      */
-    public function __construct(string $name, $defaultValue, bool $required, ?string $description, array $types)
+    public function __construct(string $name, $defaultValue, bool $required, ?string $description, array $types, array $enum)
     {
         $this->name = $name;
         $this->defaultValue = $defaultValue;
         $this->required = $required;
         $this->types = $types;
         $this->description = $description;
+        $this->enum = $enum;
     }
 
     /**
@@ -63,6 +70,14 @@ public function defaultValue()
         return $this->defaultValue;
     }
 
+    /**
+     * @return array<mixed>
+     */
+    public function enum(): array
+    {
+        return $this->enum;
+    }
+
     public function name(): string
     {
         return $this->name;
diff --git a/lib/Resolver.php b/lib/Resolver.php
index 6f32bc20..cc9ac397 100644
--- a/lib/Resolver.php
+++ b/lib/Resolver.php
@@ -31,6 +31,11 @@ class Resolver
      */
     private $descriptions = [];
 
+    /**
+     * @var array<string,array<int,mixed>>
+     */
+    private $enums = [];
+
     /**
      * @var bool
      */
@@ -67,6 +72,14 @@ public function setDefaults(array $defaults): void
         $this->defaults = array_merge($this->defaults, $defaults);
     }
 
+    /**
+     * @param array<string,array<int,mixed>> $enums
+     */
+    public function setEnums(array $enums): void
+    {
+        $this->enums = $enums;
+    }
+
     /**
      * @param array<string,string> $typeMap
      */
@@ -200,7 +213,8 @@ public function definitions(): Definitions
                 $this->defaults[$key] ?? null,
                 in_array($key, $this->required),
                 $this->descriptions[$key] ?? null,
-                isset($this->types[$key]) ? [$this->types[$key]] : []
+                isset($this->types[$key]) ? [$this->types[$key]] : [],
+                $this->enums[$key] ?? [],
             );
         }
 
diff --git a/tests/Unit/ResolverTest.php b/tests/Unit/ResolverTest.php
index 77739440..39fd12bd 100644
--- a/tests/Unit/ResolverTest.php
+++ b/tests/Unit/ResolverTest.php
@@ -172,16 +172,17 @@ public function testReturnsDefinition(): void
         $resolver->setTypes([
             'two' => 'int',
         ]);
+        $resolver->setEnums(['two' => [2]]);
 
         $definitions = $resolver->definitions();
 
         self::assertEquals(
-            new Definition('two', 2, true, 'The number two', ['int']),
+            new Definition('two', 2, true, 'The number two', ['int'], [2]),
             $definitions->get('two')
         );
 
         self::assertEquals(
-            new Definition('four', 'hello', false, null, []),
+            new Definition('four', 'hello', false, null, [], []),
             $definitions->get('four')
         );
     }