diff --git a/core/engine/Cargo.toml b/core/engine/Cargo.toml
index 55407796..19fbabf2 100644
--- a/core/engine/Cargo.toml
+++ b/core/engine/Cargo.toml
@@ -22,7 +22,7 @@ json_dotpath = { workspace = true }
 fixedbitset = "0.4.2"
 tokio = { workspace = true, features = ["sync", "time"] }
 reqwest = { version = "0.12", features = ["json", "rustls-tls"], default-features = false }
-rquickjs = { version = "0.6.2", features = ["macro", "loader", "rust-alloc", "futures", "either", "properties"] }
+rquickjs = { git = "https://github.com/stefan-gorules/rquickjs.git", branch = "master", features = ["macro", "loader", "rust-alloc", "futures", "either", "properties"] }
 itertools = { workspace = true }
 zen-expression = { path = "../expression", version = "0.24.0" }
 zen-tmpl = { path = "../template", version = "0.24.0" }
diff --git a/core/engine/tests/engine.rs b/core/engine/tests/engine.rs
index d7ca8e18..dc9e9c74 100644
--- a/core/engine/tests/engine.rs
+++ b/core/engine/tests/engine.rs
@@ -236,3 +236,33 @@ async fn engine_graph_tests() {
         }
     }
 }
+
+#[tokio::test]
+#[cfg_attr(miri, ignore)]
+async fn engine_function_v2() {
+    let engine = DecisionEngine::default().with_loader(create_fs_loader().into());
+
+    for _ in 0..1_000 {
+        let function_opt_r = engine
+            .evaluate_with_opts(
+                "function-v2.json",
+                &json!({ "input": 12 }),
+                EvaluationOptions {
+                    trace: Some(true),
+                    max_depth: None,
+                },
+            )
+            .await;
+
+        assert!(function_opt_r.is_ok(), "function v2 has errored");
+
+        let function_opt = function_opt_r.unwrap();
+        let trace = function_opt.trace.unwrap();
+        assert_eq!(trace.len(), 3); // trace for each node
+
+        assert_eq!(
+            function_opt.result,
+            json!({ "hello": "world", "multiplied": 24 })
+        )
+    }
+}
diff --git a/test-data/function-v2.json b/test-data/function-v2.json
new file mode 100644
index 00000000..b5b6cdbb
--- /dev/null
+++ b/test-data/function-v2.json
@@ -0,0 +1,48 @@
+{
+  "edges": [
+    {
+      "id": "8ec75bf7-5229-4138-8fdc-486c8f82b600",
+      "type": "edge",
+      "sourceId": "c4dbea62-f0b1-421c-a504-a82983cea33a",
+      "targetId": "54b6b317-0681-4f8f-b13a-18c579282500"
+    },
+    {
+      "id": "2d45f4f3-0afe-499f-9bc9-5d247bc036db",
+      "type": "edge",
+      "sourceId": "54b6b317-0681-4f8f-b13a-18c579282500",
+      "targetId": "48984a7a-71c9-4642-adb3-f6ce0a75bcca"
+    }
+  ],
+  "nodes": [
+    {
+      "id": "c4dbea62-f0b1-421c-a504-a82983cea33a",
+      "name": "request",
+      "type": "inputNode",
+      "position": {
+        "x": 100,
+        "y": 95
+      }
+    },
+    {
+      "id": "48984a7a-71c9-4642-adb3-f6ce0a75bcca",
+      "name": "response",
+      "type": "outputNode",
+      "position": {
+        "x": 515,
+        "y": 255
+      }
+    },
+    {
+      "id": "54b6b317-0681-4f8f-b13a-18c579282500",
+      "name": "function1",
+      "type": "functionNode",
+      "content": {
+        "source": "export const handler = async (input) => ({ hello: 'world', multiplied: input.input * 2 })"
+      },
+      "position": {
+        "x": 210,
+        "y": 285
+      }
+    }
+  ]
+}
\ No newline at end of file