diff --git a/ACKReactiveExtensions.podspec b/ACKReactiveExtensions.podspec
index a1da09c..74f710d 100644
--- a/ACKReactiveExtensions.podspec
+++ b/ACKReactiveExtensions.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'ACKReactiveExtensions'
-  s.version          = '5.3.0'
+  s.version          = '5.3.1'
   s.summary          = 'Useful extensions for ReactiveCocoa.'
   s.description      = <<-DESC
   Use ReactiveCocoa with various iOS components.
diff --git a/ACKReactiveExtensions/Realm/RealmExtensions.swift b/ACKReactiveExtensions/Realm/RealmExtensions.swift
index ba5c491..5479c97 100644
--- a/ACKReactiveExtensions/Realm/RealmExtensions.swift
+++ b/ACKReactiveExtensions/Realm/RealmExtensions.swift
@@ -262,7 +262,7 @@ public extension Reactive where Base: UIViewController, Base: RealmTableViewRelo
 
 //MARK: PrimaryKeyEquatable
 
-protocol PrimaryKeyEquatable: class {
+protocol PrimaryKeyEquatable: AnyObject {
     static func primaryKey() -> String?
     subscript(key: String) -> Any? { get set }
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e952d3d..e28fcad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@
 
 ## master
 
+## 5.3.1
+
+- update dependencies (#54, kudos to @IgorRosocha)
+
 ## 5.3.0
 
 - update dependencies, use Xcode 12.4 (#51, kudos to @olejnjak)
diff --git a/Cartfile.resolved b/Cartfile.resolved
index 7a84eeb..29fbb2a 100644
--- a/Cartfile.resolved
+++ b/Cartfile.resolved
@@ -1,6 +1,6 @@
 github "Alamofire/Alamofire" "4.9.1"
 github "Alamofire/AlamofireImage" "3.6.0"
-github "ReactiveCocoa/ReactiveCocoa" "11.2.0"
+github "ReactiveCocoa/ReactiveCocoa" "11.2.1"
 github "ReactiveCocoa/ReactiveSwift" "6.6.0"
-github "realm/realm-cocoa" "v10.7.3"
+github "realm/realm-cocoa" "v10.8.1"
 github "utahiosmac/Marshal" "1.2.8"
diff --git a/Package.resolved b/Package.resolved
index bb3e713..fc7d64f 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -33,8 +33,8 @@
         "repositoryURL": "https://github.com/ReactiveCocoa/ReactiveCocoa",
         "state": {
           "branch": null,
-          "revision": "cca8bdc26d10a889b8bec3cc2167544df730953e",
-          "version": "11.1.0"
+          "revision": "376f98e9341bfe4daba01909d51acf47fde456d7",
+          "version": "11.2.1"
         }
       },
       {
@@ -42,8 +42,8 @@
         "repositoryURL": "https://github.com/ReactiveCocoa/ReactiveSwift",
         "state": {
           "branch": null,
-          "revision": "e03cda84105ba707de039b757e2b2de868c65a3e",
-          "version": "6.5.0"
+          "revision": "4a8e1e4a683e96daf658f68132dae781738bc862",
+          "version": "6.6.0"
         }
       },
       {
@@ -51,8 +51,8 @@
         "repositoryURL": "https://github.com/realm/realm-cocoa",
         "state": {
           "branch": null,
-          "revision": "44b9632b22240f0baa4b50964c5722e27094aea0",
-          "version": "10.6.0"
+          "revision": "827f9bf97f44e40fda8a750698f3e096734629ee",
+          "version": "10.8.1"
         }
       },
       {
@@ -60,8 +60,8 @@
         "repositoryURL": "https://github.com/realm/realm-core",
         "state": {
           "branch": null,
-          "revision": "6431a4bc6530ec16731ef1c66b379cbef6da01f0",
-          "version": "10.5.0"
+          "revision": "d85d071cc25b6f64fabbbebbaaae20f367ef64ae",
+          "version": "11.0.3"
         }
       }
     ]