diff --git a/devbox.lock b/devbox.lock
index d834c1d..dde6860 100644
--- a/devbox.lock
+++ b/devbox.lock
@@ -103,7 +103,7 @@
     },
     "nodejs@20": {
       "last_modified": "2025-09-21T09:21:16Z",
-      "plugin_version": "0.0.2",
+      "plugin_version": "0.0.4",
       "resolved": "github:NixOS/nixpkgs/a1f79a1770d05af18111fbbe2a3ab2c42c0f6cd0#nodejs_20",
       "source": "devbox-search",
       "version": "20.19.5",
diff --git a/src/Gren/Kernel/Stream.js b/src/Gren/Kernel/Stream.js
index 6efc3ba..5e8cf4b 100644
--- a/src/Gren/Kernel/Stream.js
+++ b/src/Gren/Kernel/Stream.js
@@ -135,10 +135,20 @@ var _Stream_closeWritable = function (stream) {
     }
 
     const writer = stream.getWriter();
-    writer.close();
-    writer.releaseLock();
-
-    callback(__Scheduler_succeed({}));
+    writer
+      .close()
+      .then(() => {
+        writer.releaseLock();
+        callback(__Scheduler_succeed({}));
+      })
+      .catch((err) => {
+        writer.releaseLock();
+        callback(
+          __Scheduler_fail(
+            __Stream_Cancelled(_Stream_cancellationErrorString(err)),
+          ),
+        );
+      });
   });
 };
 
diff --git a/tests/gren.json b/tests/gren.json
index 69e3141..b5d8395 100644
--- a/tests/gren.json
+++ b/tests/gren.json
@@ -4,7 +4,7 @@
     "source-directories": [
         "src"
     ],
-    "gren-version": "0.6.3",
+    "gren-version": "0.6.5",
     "dependencies": {
         "direct": {
             "gren-lang/core": "local:../",