diff --git a/package.json b/package.json
index 71397ab0..fe2f311e 100644
--- a/package.json
+++ b/package.json
@@ -110,7 +110,7 @@
     "web-streams-polyfill": "^4.0.0"
   },
   "overrides": {
-    "@web/dev-server-core": "npm:@openpgp/wtr-dev-server-core@0.7.3-patch.0"
+    "@web/dev-server-core": "npm:@openpgp/wtr-dev-server-core@0.7.3-patch.1"
   },
   "repository": {
     "type": "git",
diff --git a/test/unittests.html b/test/unittests.html
index f8381f7e..23784b22 100644
--- a/test/unittests.html
+++ b/test/unittests.html
@@ -18,12 +18,19 @@
           timeout: 30000
         });
 
-        await import('./lib/unittests-bundle.js');
-
-        // run the tests, and notify the test runner after finishing
-        mocha.run(() => {
-          sessionFinished();
-        });
+        // Safari 14 does not support top-level await
+        import('./lib/unittests-bundle.js')
+          .then(() => {
+            // run the tests, and notify the test runner after finishing
+            mocha.run(() => {
+              sessionFinished();
+            });
+          })
+          .catch(err => {
+            console.error(err);
+            // notify the test runner about errors
+            sessionFailed(err);
+          });
       } catch (error) {
         console.error(error);
         // notify the test runner about errors