diff --git a/src/clipboard-action.js b/src/clipboard-action.js
index da0496d..db3eb58 100644
--- a/src/clipboard-action.js
+++ b/src/clipboard-action.js
@@ -51,7 +51,7 @@ class ClipboardAction {
      * and makes a selection on it.
      */
     selectFake() {
-        let isRTL = document.documentElement.getAttribute('dir') == 'rtl';
+        const isRTL = document.documentElement.getAttribute('dir') == 'rtl';
 
         this.removeFake();
 
diff --git a/src/clipboard.js b/src/clipboard.js
index 270e41b..ea0da1e 100644
--- a/src/clipboard.js
+++ b/src/clipboard.js
@@ -42,7 +42,7 @@ class Clipboard extends Emitter {
      * @param {Event} e
      */
     onClick(e) {
-        let trigger = e.delegateTarget || e.currentTarget;
+        const trigger = e.delegateTarget || e.currentTarget;
 
         if (this.clipboardAction) {
             this.clipboardAction = null;
@@ -70,7 +70,7 @@ class Clipboard extends Emitter {
      * @param {Element} trigger
      */
     defaultTarget(trigger) {
-        let selector = getAttributeValue('target', trigger);
+        const selector = getAttributeValue('target', trigger);
 
         if (selector) {
             return document.querySelector(selector);
@@ -105,7 +105,7 @@ class Clipboard extends Emitter {
  * @param {Element} element
  */
 function getAttributeValue(suffix, element) {
-    let attribute = `data-clipboard-${suffix}`;
+    const attribute = `data-clipboard-${suffix}`;
 
     if (!element.hasAttribute(attribute)) {
         return;