diff --git a/changelog.md b/changelog.md
index 2c53a9f..5bfd6f2 100644
--- a/changelog.md
+++ b/changelog.md
@@ -12,4 +12,8 @@
 
 ### 1.0.4 - 1.0.8
 
-(No changes)
\ No newline at end of file
+(No changes)
+
+### 1.0.9
+
+* Added compare function type check.
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 440a493..372b201 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "mapsort",
-  "version": "1.0.8",
+  "version": "1.0.9",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "mapsort",
-      "version": "1.0.8",
+      "version": "1.0.9",
       "license": "MIT",
       "devDependencies": {
         "@babel/core": "^7.23.7",
diff --git a/package.json b/package.json
index 8ca6959..c77b23c 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "mapsort",
   "description": "Performant sorting for complex input",
-  "version": "1.0.8",
+  "version": "1.0.9",
   "main": "compiled/cjs/mapsort.min.js",
   "module": "compiled/esm/mapsort.min.js",
   "unpkg": "compiled/iife/mapsort.min.js",
diff --git a/readme-nl.md b/readme-nl.md
index 165d80e..7136974 100644
--- a/readme-nl.md
+++ b/readme-nl.md
@@ -39,7 +39,7 @@ import mapSort from 'mapsort';
 
 Als alternatief kan `mapsort` ook worden binnengehaald met unpkg:
 ```html
-<script src="https://unpkg.com/mapsort@^1.0.8"></script>
+<script src="https://unpkg.com/mapsort@^1.0.9"></script>
 ```
 Met deze aanpak wordt de functie beschikbaar als `window.mapSort`.
 
diff --git a/readme.md b/readme.md
index e0da32b..c0527cc 100644
--- a/readme.md
+++ b/readme.md
@@ -39,7 +39,7 @@ import mapSort from 'mapsort';
 
 Alternatively, include `mapsort` through unpkg:
 ```html
-<script src="https://unpkg.com/mapsort@^1.0.8"></script>
+<script src="https://unpkg.com/mapsort@^1.0.9"></script>
 ```
 This alternative makes the function available at `window.mapSort`.