diff --git a/CHANGELOG.md b/CHANGELOG.md
index 46e53d1..3e127d8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,19 +1,33 @@
 ## Changelog
 
+## 2.15.0
+
+- [feature] support configuring z-index for Popover component
+- [fix] change default z-index value of Modal component to auto
+
+## 2.14.0
+
+- [feature] support configuring z-index for Modal component
+
 ## 2.13.0
+
 - [feature] add prop exitOnUnderlayClicked to Modal component
 
 ## 2.12.0
+
 - [feature] add possibility to pass onCopy to Copiable component
 
 ## 2.11.0
+
 - [feature] support onOpenChange handler for contextMenu
 
 ## 2.10.2
+
 - [feature] upgrade @mapbox/mbx-assembly to 1.6.0
 
 ## 2.10.0
-- [feature] upgrade to react 18 
+
+- [feature] upgrade to react 18
 
 ## 2.9.0
 
diff --git a/package-lock.json b/package-lock.json
index 9b5915b..770061a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@mapbox/mr-ui",
-  "version": "2.14.0",
+  "version": "2.15.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@mapbox/mr-ui",
-      "version": "2.14.0",
+      "version": "2.15.0",
       "license": "BSD-2-Clause",
       "dependencies": {
         "@mapbox/mbx-assembly": "^1.6.0",
diff --git a/package.json b/package.json
index 4c29a6e..57b8784 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@mapbox/mr-ui",
-  "version": "2.14.0",
+  "version": "2.15.0",
   "description": "UI components for Mapbox projects",
   "main": "index.js",
   "homepage": "./",
diff --git a/src/components/modal/modal.tsx b/src/components/modal/modal.tsx
index bc86cc2..653d2a4 100644
--- a/src/components/modal/modal.tsx
+++ b/src/components/modal/modal.tsx
@@ -222,7 +222,7 @@ Modal.propTypes = {
   /**
    * z-index of the modal
    */
-  zIndex: PropTypes.number || PropTypes.string,
+  zIndex: PropTypes.number,
   /**
    * The modal's primary action. If this is provided, an encouraging
    * button will be rendered at the bottom of the modal.
diff --git a/src/components/popover/popover.tsx b/src/components/popover/popover.tsx
index 878a3d5..f15e7cf 100644
--- a/src/components/popover/popover.tsx
+++ b/src/components/popover/popover.tsx
@@ -159,11 +159,11 @@ Popover.propTypes = {
   /**
    * `'medium'`, `'small'`, or `'none'`.
    */
-  padding: PropTypes.oneOf(['medium', 'small', 'none'])
+  padding: PropTypes.oneOf(['medium', 'small', 'none']),
   /**
    * z-index of the popover.
-   */,
-  zIndex: PropTypes.number || PropTypes.string,
+   */
+  zIndex: PropTypes.number,
   /**
    * Whether or not the popover has a triangle pointer.
    */