diff --git a/chompfile.toml b/chompfile.toml
index 16c717f9..3de80439 100644
--- a/chompfile.toml
+++ b/chompfile.toml
@@ -60,3 +60,4 @@ dep = 'test:'
 name = 'test:##'
 dep = 'test/##.test.ts'
 run = 'tsx $DEP'
+serial = true
diff --git a/package-lock.json b/package-lock.json
index ec634bb5..3b2f034d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,7 +9,7 @@
       "version": "3.0.0",
       "license": "Apache-2.0",
       "dependencies": {
-        "@jspm/generator": "^1.1.7",
+        "@jspm/generator": "^1.1.9",
         "cac": "^6.7.14",
         "ora": "^6.3.0",
         "picocolors": "^1.0.0"
@@ -1603,9 +1603,9 @@
       "integrity": "sha512-XPSJHWmi394fuUuzDnGz1wiKqWfo1yXecHQMRf2l6hztTO+nPru658AyDngaBe7isIxEkRsPR3FZh+s7iVa4Uw=="
     },
     "node_modules/@jspm/generator": {
-      "version": "1.1.7",
-      "resolved": "https://registry.npmjs.org/@jspm/generator/-/generator-1.1.7.tgz",
-      "integrity": "sha512-m9dfJ5O7zjwOlnx1f6mDRCQH2T8VwZ9cdd3OnnFIYpCWTrTfcBXuVIfyNKf3UjLfFRGe5N2EICtRudXvfNYYxA==",
+      "version": "1.1.9",
+      "resolved": "https://registry.npmjs.org/@jspm/generator/-/generator-1.1.9.tgz",
+      "integrity": "sha512-ZSr+yeceUv/+h8tMH68bvzMWwe4rzW+ihx94N0f7ifGLUvT2r7I/tS7l1hpB0kMtL+DIfgS7ENt5gpQIXgrdrQ==",
       "dependencies": {
         "@babel/core": "^7.20.12",
         "@babel/plugin-syntax-import-assertions": "^7.20.0",
diff --git a/package.json b/package.json
index c9cef2df..a3deb577 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "jspm.js"
   ],
   "dependencies": {
-    "@jspm/generator": "^1.1.7",
+    "@jspm/generator": "^1.1.9",
     "cac": "^6.7.14",
     "ora": "^6.3.0",
     "picocolors": "^1.0.0"
diff --git a/test/ownname.test.ts b/test/ownname.test.ts
index 88152770..cdbf9d31 100644
--- a/test/ownname.test.ts
+++ b/test/ownname.test.ts
@@ -9,12 +9,11 @@ const scenarios: Scenario[] = [
     commands: ["jspm install app"],
     validationFn: async (files: Map<string, string>) => {
       // Installing the own-name package "app" should result in the version of
-      // es-module-lexer in the import map remaining the same, since it's a
-      // transitive dependency of "./app.js", even though it violates the lock:
-      // TODO: is this the behaviour we want?
+      // es-module-lexer in the import map being upgraded to 1.2.2, since it's a
+      // transitive dependency of "./app.js".
       const map = JSON.parse(files.get("importmap.json"));
       assert(
-        map?.imports?.["es-module-lexer"]?.includes("es-module-lexer@0.10.5")
+        map?.imports?.["es-module-lexer"]?.includes("es-module-lexer@1.2.1")
       );
     },
   },
diff --git a/test/scenarios.ts b/test/scenarios.ts
index d2296e72..0f8a5e06 100644
--- a/test/scenarios.ts
+++ b/test/scenarios.ts
@@ -46,8 +46,8 @@ export async function runScenario(scenario: Scenario) {
       cause: err,
     });
   } finally {
-    await deleteTmpPkg(dir);
     process.chdir(cwd);
+    await deleteTmpPkg(dir);
   }
 }
 
@@ -61,7 +61,7 @@ export async function mapDirectory(dir: string): Promise<Files> {
     } else {
       const subFiles = await mapDirectory(filePath);
       for (const [subFile, subData] of subFiles) {
-        files.set(path.join(file, subFile), subData);
+        files.set(path.join(file, subFile).replace(/\\/g, '/'), subData);
       }
     }
   }
@@ -99,7 +99,16 @@ async function createTmpPkg(scenario: Scenario): Promise<string> {
 async function deleteTmpPkg(dir: string) {
   if (dir.startsWith(os.tmpdir())) {
     // ensure it's a tmp dir
-    return fs.rm(dir, { recursive: true });
+    while (true) {
+      try {
+        await fs.rm(dir, { recursive: true });
+        return;
+      }
+      catch (err) {
+        if (err.code === 'EBUSY')
+          await new Promise(resolve => setTimeout(resolve, 10));
+      }
+    }
   } else {
     throw new Error(`Cannot delete ${dir} as it is not a temporary directory.`);
   }