diff --git a/.travis.yml b/.travis.yml
index 59e3899..b2a600d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,6 +3,7 @@ php:
   - '7.1'
   - '7.2'
   - '7.3'
+  - '7.4'
 
 before_script:
   - composer install
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9185eeb..d565111 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+## [2.1.1] - 2019-12-19
+### Fixed
+- ResourceIdentifier does not allow multiple meta members (#99)
+
 ## [2.1.0] - 2019-02-25
 ### Fixed
 - Relationship without data property (#92)
@@ -18,6 +22,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ### Added
 - v2 initial release
 
-[Unreleased]: https://github.com/json-api-php/json-api/compare/2.1.0...HEAD
+[Unreleased]: https://github.com/json-api-php/json-api/compare/2.1.1...HEAD
+[2.2.0]: https://github.com/json-api-php/json-api/compare/2.1.0...2.1.1
 [2.1.0]: https://github.com/json-api-php/json-api/compare/2.0.1...2.1.0
 [2.0.1]: https://github.com/json-api-php/json-api/compare/2.0.0...2.0.1
diff --git a/src/ResourceIdentifier.php b/src/ResourceIdentifier.php
index 2974492..dff34f8 100644
--- a/src/ResourceIdentifier.php
+++ b/src/ResourceIdentifier.php
@@ -16,7 +16,7 @@ final class ResourceIdentifier implements PrimaryData
      */
     private $id;
 
-    public function __construct(string $type, string $id, Meta $meta = null)
+    public function __construct(string $type, string $id, Meta ...$metas)
     {
         if (isValidName($type) === false) {
             throw new \DomainException("Invalid type value: $type");
@@ -26,7 +26,7 @@ public function __construct(string $type, string $id, Meta $meta = null)
             'type' => $type,
             'id' => $id,
         ];
-        if ($meta) {
+        foreach ($metas as $meta) {
             $meta->attachTo($this->obj);
         }
         $this->type = $type;
diff --git a/test/DataDocument/SingleResourceIdentifierTest.php b/test/DataDocument/SingleResourceIdentifierTest.php
index 92a91d5..1d12a77 100644
--- a/test/DataDocument/SingleResourceIdentifierTest.php
+++ b/test/DataDocument/SingleResourceIdentifierTest.php
@@ -36,7 +36,10 @@ public function testExtendedDocument()
                 "data": {
                     "type": "apples",
                     "id": "1",
-                    "meta": {"apple_meta": "foo"}
+                    "meta": {
+                        "apple_meta": "foo", 
+                        "bar": [42]
+                    }
                 },
                 "links": {
                     "self": "/apples/1"
@@ -51,7 +54,8 @@ public function testExtendedDocument()
                 new ResourceIdentifier(
                     'apples',
                     '1',
-                    new Meta('apple_meta', 'foo')
+                    new Meta('apple_meta', 'foo'),
+                    new Meta('bar', [42])
                 ),
                 new SelfLink('/apples/1'),
                 new JsonApi(),