diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3249508e1d..0c494f42f4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,8 @@
-# 0.10
+# 0.10.1
+
+* replaced Mutex with DebugMutex and thus with parking_lot
+
+# 0.10.0
 
 * removed Js*Adapter/Facade traits
 * renamed JSValueRef to QuickjsValueAdapter
diff --git a/Cargo.toml b/Cargo.toml
index 55aedbd4bb..b6bdd98bef 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "quickjs_runtime"
-version = "0.10.0"
+version = "0.10.1"
 authors = ["Andries Hiemstra <info@hirofa.com>"]
 edition = "2018"
 description = "Wrapper API and utils for the QuickJS JavaScript engine with support for Promise, Modules, Async/await"
diff --git a/src/jsutils/promises.rs b/src/jsutils/promises.rs
index 88fa6399dd..88aab91e5e 100644
--- a/src/jsutils/promises.rs
+++ b/src/jsutils/promises.rs
@@ -62,7 +62,7 @@ where
                                                 err.get_message(),
                                                 err.get_stack(),
                                             )
-                                            .expect("could not create str");
+                                            .expect("could not create error");
                                         prom_ref
                                             .js_promise_reject(realm, &err_ref)
                                             .expect("prom rejection failed");
@@ -77,7 +77,7 @@ where
                                         err.get_message(),
                                         err.get_stack(),
                                     )
-                                    .expect("could not create str");
+                                    .expect("could not create error");
                                 prom_ref
                                     .js_promise_reject(realm, &err_ref)
                                     .expect("prom rejection failed");
diff --git a/src/quickjsrealmadapter.rs b/src/quickjsrealmadapter.rs
index a111fb627b..3d461e35d3 100644
--- a/src/quickjsrealmadapter.rs
+++ b/src/quickjsrealmadapter.rs
@@ -1015,7 +1015,7 @@ impl QuickJsRealmAdapter {
                 Ok(obj)
             }
             JsValueFacade::Promise { producer } => {
-                let producer = &mut *producer.lock().unwrap();
+                let producer = &mut *producer.lock("from_js_value_facade").unwrap();
                 if producer.is_some() {
                     self.create_resolving_promise_async(producer.take().unwrap(), |realm, jsvf| {
                         realm.from_js_value_facade(jsvf)
diff --git a/src/values.rs b/src/values.rs
index 3f2e148e62..4ac47f11e8 100644
--- a/src/values.rs
+++ b/src/values.rs
@@ -5,6 +5,7 @@ use crate::quickjsvalueadapter::QuickJsValueAdapter;
 use crate::reflection::JsProxyInstanceId;
 use futures::executor::block_on;
 use futures::Future;
+use hirofa_utils::debug_mutex::DebugMutex;
 use hirofa_utils::resolvable_future::ResolvableFuture;
 use serde::Serialize;
 use serde_json::Value;
@@ -12,14 +13,14 @@ use std::collections::HashMap;
 use std::error::Error;
 use std::fmt::{Debug, Formatter};
 use std::pin::Pin;
-use std::sync::{Arc, Mutex, Weak};
+use std::sync::{Arc, Weak};
 use string_cache::DefaultAtom;
 
 pub struct CachedJsObjectRef {
     pub(crate) id: i32,
     rti: Weak<QuickjsRuntimeFacadeInner>,
     realm_id: String,
-    drop_action: Mutex<Option<Box<dyn FnOnce() + Send>>>,
+    drop_action: DebugMutex<Option<Box<dyn FnOnce() + Send>>>,
 }
 
 pub struct CachedJsPromiseRef {
@@ -67,7 +68,10 @@ impl CachedJsObjectRef {
             id,
             rti,
             realm_id: realm_name,
-            drop_action: Mutex::new(Some(Box::new(drop_action))),
+            drop_action: DebugMutex::new(
+                Some(Box::new(drop_action)),
+                "CachedJsObjectRef.drop_action",
+            ),
         }
     }
     pub async fn to_json_string(&self) -> Result<String, JsError> {
@@ -184,7 +188,7 @@ impl CachedJsObjectRef {
 
 impl Drop for CachedJsObjectRef {
     fn drop(&mut self) {
-        let lck = &mut *self.drop_action.lock().unwrap();
+        let lck = &mut *self.drop_action.lock("drop").unwrap();
         if let Some(da) = lck.take() {
             da();
         }
@@ -376,7 +380,7 @@ pub enum JsValueFacade {
     },
     // promise created from rust which will run an async producer
     Promise {
-        producer: Mutex<
+        producer: DebugMutex<
             Option<Pin<Box<dyn Future<Output = Result<JsValueFacade, JsError>> + Send + 'static>>>,
         >,
     },
@@ -466,7 +470,7 @@ impl JsValueFacade {
         P: Future<Output = Result<JsValueFacade, JsError>> + Send + 'static,
     {
         JsValueFacade::Promise {
-            producer: Mutex::new(Some(Box::pin(producer))),
+            producer: DebugMutex::new(Some(Box::pin(producer)), "JsValueFacade::Promise.producer"),
         }
     }