diff --git a/dist/index.js b/dist/index.js
index cbbc6eb..04805ef 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -265,7 +265,7 @@ function isUrlInvalid(newUrls, url) {
             return true;
         }
         // Is it a new file in this PR that isn't published yet?
-        return !newUrls.includes(url);
+        return !newUrls.includes(url.toLowerCase());
     });
 }
 exports.isUrlInvalid = isUrlInvalid;
diff --git a/package.json b/package.json
index e659c25..c965ca9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "changelog-link-check",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "GitHub action to detect and block pull requests with invalid links in changelog files",
   "main": "lib/index.js",
   "scripts": {
diff --git a/src/validation.ts b/src/validation.ts
index 247e677..a03dda7 100644
--- a/src/validation.ts
+++ b/src/validation.ts
@@ -94,7 +94,7 @@ export async function isUrlInvalid(
   }
 
   // Is it a new file in this PR that isn't published yet?
-  return !newUrls.includes(url);
+  return !newUrls.includes(url.toLowerCase());
 }
 
 export function generatePrComment(errorFiles: FileBrokenLinks[]): string {