diff --git a/SkeletonViewCore/Sources/Internal/Collections/CollectionSkeleton.swift b/SkeletonViewCore/Sources/Internal/Collections/CollectionSkeleton.swift
index 578ad596..70c93611 100644
--- a/SkeletonViewCore/Sources/Internal/Collections/CollectionSkeleton.swift
+++ b/SkeletonViewCore/Sources/Internal/Collections/CollectionSkeleton.swift
@@ -9,8 +9,8 @@
 import UIKit
 
 enum CollectionAssociatedKeys {
-    static var dummyDataSource = "dummyDataSource"
-    static var dummyDelegate = "dummyDelegate"
+    static var dummyDataSource: StaticString = "dummyDataSource"
+    static var dummyDelegate: StaticString = "dummyDelegate"
 }
 
 protocol CollectionSkeleton {
diff --git a/SkeletonViewCore/Sources/Internal/SkeletonExtensions/SkeletonTextNode.swift b/SkeletonViewCore/Sources/Internal/SkeletonExtensions/SkeletonTextNode.swift
index 84233486..db74e3b8 100644
--- a/SkeletonViewCore/Sources/Internal/SkeletonExtensions/SkeletonTextNode.swift
+++ b/SkeletonViewCore/Sources/Internal/SkeletonExtensions/SkeletonTextNode.swift
@@ -29,13 +29,13 @@ protocol SkeletonTextNode {
 
 enum SkeletonTextNodeAssociatedKeys {
     
-    static var lastLineFillingPercent = "lastLineFillingPercent"
-    static var multilineCornerRadius = "multilineCornerRadius"
-    static var multilineSpacing = "multilineSpacing"
-    static var paddingInsets = "paddingInsets"
-    static var backupHeightConstraints = "backupHeightConstraints"
-    static var textLineHeight = "textLineHeight"
-    static var skeletonNumberOfLines = "skeletonNumberOfLines"
+    static var lastLineFillingPercent: StaticString = "lastLineFillingPercent"
+    static var multilineCornerRadius: StaticString = "multilineCornerRadius"
+    static var multilineSpacing: StaticString = "multilineSpacing"
+    static var paddingInsets: StaticString = "paddingInsets"
+    static var backupHeightConstraints: StaticString = "backupHeightConstraints"
+    static var textLineHeight: StaticString = "textLineHeight"
+    static var skeletonNumberOfLines: StaticString = "skeletonNumberOfLines"
     
 }
 
diff --git a/SkeletonViewCore/Sources/Internal/UIKitExtensions/UIView+AssociatedObjects.swift b/SkeletonViewCore/Sources/Internal/UIKitExtensions/UIView+AssociatedObjects.swift
index 25dd87fb..91e0308c 100644
--- a/SkeletonViewCore/Sources/Internal/UIKitExtensions/UIView+AssociatedObjects.swift
+++ b/SkeletonViewCore/Sources/Internal/UIKitExtensions/UIView+AssociatedObjects.swift
@@ -16,21 +16,21 @@ import UIKit
 // codebeat:disable[TOO_MANY_IVARS]
 enum ViewAssociatedKeys {
     
-    static var skeletonable = "skeletonable"
-    static var hiddenWhenSkeletonIsActive = "hiddenWhenSkeletonIsActive"
-    static var status = "status"
-    static var skeletonLayer = "layer"
-    static var flowDelegate = "flowDelegate"
-    static var isSkeletonAnimated = "isSkeletonAnimated"
-    static var viewState = "viewState"
-    static var labelViewState = "labelViewState"
-    static var imageViewState = "imageViewState"
-    static var buttonViewState = "buttonViewState"
-    static var headerFooterViewState = "headerFooterViewState"
-    static var currentSkeletonConfig = "currentSkeletonConfig"
-    static var skeletonCornerRadius = "skeletonCornerRadius"
-    static var disabledWhenSkeletonIsActive = "disabledWhenSkeletonIsActive"
-    static var delayedShowSkeletonWorkItem = "delayedShowSkeletonWorkItem"
+    static var skeletonable: StaticString = "skeletonable"
+    static var hiddenWhenSkeletonIsActive: StaticString = "hiddenWhenSkeletonIsActive"
+    static var status: StaticString = "status"
+    static var skeletonLayer: StaticString = "layer"
+    static var flowDelegate: StaticString = "flowDelegate"
+    static var isSkeletonAnimated: StaticString = "isSkeletonAnimated"
+    static var viewState: StaticString = "viewState"
+    static var labelViewState: StaticString = "labelViewState"
+    static var imageViewState: StaticString = "imageViewState"
+    static var buttonViewState: StaticString = "buttonViewState"
+    static var headerFooterViewState: StaticString = "headerFooterViewState"
+    static var currentSkeletonConfig: StaticString = "currentSkeletonConfig"
+    static var skeletonCornerRadius: StaticString = "skeletonCornerRadius"
+    static var disabledWhenSkeletonIsActive: StaticString = "disabledWhenSkeletonIsActive"
+    static var delayedShowSkeletonWorkItem: StaticString = "delayedShowSkeletonWorkItem"
     
 }
 // codebeat:enable[TOO_MANY_IVARS]