diff --git a/changelog.md b/changelog.md
index ce54c30..6ab1ef6 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## 2026-03-26 - 3.6.1 - fix(chromium runtime)
+encode Chromium test bundle names correctly for nested file paths
+
+- Use replaceAll() so bundle cache filenames consistently handle test paths with multiple directory separators.
+- URL-encode the bundleName query parameter before opening the Chromium test page to avoid lookup issues with generated bundle filenames.
+
 ## 2026-03-24 - 3.6.0 - feat(config)
 migrate project metadata to .smartconfig and refresh build configuration
 
diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index 2d7e069..38f40a9 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@git.zone/tstest',
-  version: '3.6.0',
+  version: '3.6.1',
   description: 'A powerful, modern test runner for TypeScript with multi-runtime support (Node.js, Deno, Bun, Chromium) and a batteries-included test framework.'
 }
diff --git a/ts/tstest.classes.runtime.chromium.ts b/ts/tstest.classes.runtime.chromium.ts
index 3f01390..2216c8c 100644
--- a/ts/tstest.classes.runtime.chromium.ts
+++ b/ts/tstest.classes.runtime.chromium.ts
@@ -103,7 +103,7 @@ export class ChromiumRuntimeAdapter extends RuntimeAdapter {
 
     // lets get all our paths sorted
     const tsbundleCacheDirPath = plugins.path.join(paths.cwd, './.nogit/tstest_cache');
-    const bundleFileName = testFile.replace('/', '__') + '.js';
+    const bundleFileName = testFile.replaceAll('/', '__') + '.js';
     const bundleFilePath = plugins.path.join(tsbundleCacheDirPath, bundleFileName);
 
     // lets bundle the test
@@ -159,7 +159,7 @@ export class ChromiumRuntimeAdapter extends RuntimeAdapter {
     await this.smartbrowserInstance.start();
 
     const evaluatePromise = this.smartbrowserInstance.evaluateOnPage(
-      `http://localhost:${httpPort}/test?bundleName=${bundleFileName}`,
+      `http://localhost:${httpPort}/test?bundleName=${encodeURIComponent(bundleFileName)}`,
       async () => {
         // lets enable real time comms
         const ws = new WebSocket(`ws://localhost:${globalThis.wsPort}`);
diff --git a/ts/tstest.classes.tstest.ts b/ts/tstest.classes.tstest.ts
index 8aec65b..363a47f 100644
--- a/ts/tstest.classes.tstest.ts
+++ b/ts/tstest.classes.tstest.ts
@@ -531,7 +531,7 @@ import '${absoluteTestFile.replace(/\\/g, '/')}';
 
     // lets get all our paths sorted
     const tsbundleCacheDirPath = plugins.path.join(paths.cwd, './.nogit/tstest_cache');
-    const bundleFileName = fileNameArg.replace('/', '__') + '.js';
+    const bundleFileName = fileNameArg.replaceAll('/', '__') + '.js';
     const bundleFilePath = plugins.path.join(tsbundleCacheDirPath, bundleFileName);
 
     // lets bundle the test
@@ -587,7 +587,7 @@ import '${absoluteTestFile.replace(/\\/g, '/')}';
     await this.smartbrowserInstance.start();
     
     const evaluatePromise = this.smartbrowserInstance.evaluateOnPage(
-      `http://localhost:${httpPort}/test?bundleName=${bundleFileName}`,
+      `http://localhost:${httpPort}/test?bundleName=${encodeURIComponent(bundleFileName)}`,
       async () => {
         // lets enable real time comms
         const ws = new WebSocket(`ws://localhost:${globalThis.wsPort}`);