diff --git a/Cargo.toml b/Cargo.toml
index 76fb4d41..f6e8b26c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -37,7 +37,7 @@ pam = "0.7"
 pam-sys = "0.5"
 percent-encoding = "2.1"
 pin-utils = "0.1.0"
-proxmox = { version = "0.1.30", features = [ "sortable-macro", "api-macro" ] }
+proxmox = { version = "0.1.31", features = [ "sortable-macro", "api-macro" ] }
 #proxmox = { git = "ssh://gitolite3@proxdev.maurer-it.com/rust/proxmox", version = "0.1.2", features = [ "sortable-macro", "api-macro" ] }
 #proxmox = { path = "../proxmox/proxmox", features = [ "sortable-macro", "api-macro" ] }
 regex = "1.2"
diff --git a/src/api2/backup/environment.rs b/src/api2/backup/environment.rs
index 863ad764..08c2cdc9 100644
--- a/src/api2/backup/environment.rs
+++ b/src/api2/backup/environment.rs
@@ -2,7 +2,7 @@ use anyhow::{bail, Error};
 use std::sync::{Arc, Mutex};
 use std::collections::HashMap;
 
-use serde_json::Value;
+use serde_json::{json, Value};
 
 use proxmox::tools::digest_to_hex;
 use proxmox::tools::fs::{replace_file, CreateOptions};
@@ -80,7 +80,7 @@ impl SharedBackupState {
 #[derive(Clone)]
 pub struct BackupEnvironment {
     env_type: RpcEnvironmentType,
-    result_attributes: HashMap<String, Value>,
+    result_attributes: Value,
     user: String,
     pub debug: bool,
     pub formatter: &'static OutputFormatter,
@@ -110,7 +110,7 @@ impl BackupEnvironment {
         };
 
         Self {
-            result_attributes: HashMap::new(),
+            result_attributes: json!({}),
             env_type,
             user,
             worker,
@@ -480,12 +480,12 @@ impl BackupEnvironment {
 
 impl RpcEnvironment for BackupEnvironment {
 
-    fn set_result_attrib(&mut self, name: &str, value: Value) {
-        self.result_attributes.insert(name.into(), value);
+    fn result_attrib_mut(&mut self) -> &mut Value {
+        &mut self.result_attributes
     }
 
-    fn get_result_attrib(&self, name: &str) -> Option<&Value> {
-        self.result_attributes.get(name)
+    fn result_attrib(&self) -> &Value {
+        &self.result_attributes
     }
 
     fn env_type(&self) -> RpcEnvironmentType {
diff --git a/src/api2/node/network.rs b/src/api2/node/network.rs
index 56b6ff1d..352be401 100644
--- a/src/api2/node/network.rs
+++ b/src/api2/node/network.rs
@@ -66,7 +66,7 @@ fn check_duplicate_gateway_v6(config: &NetworkConfig, iface: &str) -> Result<(),
 pub fn list_network_devices(
     _param: Value,
     _info: &ApiMethod,
-    rpcenv: &mut dyn RpcEnvironment,
+    mut rpcenv: &mut dyn RpcEnvironment,
 ) -> Result<Value, Error> {
 
     let (config, digest) = network::config()?;
@@ -84,7 +84,7 @@ pub fn list_network_devices(
 
     let diff = network::changes()?;
     if !diff.is_empty() {
-        rpcenv.set_result_attrib("changes",  diff.into());
+        rpcenv["changes"] = diff.into();
     }
 
     Ok(list.into())
diff --git a/src/api2/node/syslog.rs b/src/api2/node/syslog.rs
index 555d0d46..8bd7b4c4 100644
--- a/src/api2/node/syslog.rs
+++ b/src/api2/node/syslog.rs
@@ -131,7 +131,7 @@ fn dump_journal(
 fn get_syslog(
     param: Value,
     _info: &ApiMethod,
-    rpcenv: &mut dyn RpcEnvironment,
+    mut rpcenv: &mut dyn RpcEnvironment,
 ) -> Result<Value, Error> {
 
     let (count, lines) = dump_journal(
@@ -141,7 +141,7 @@ fn get_syslog(
         param["until"].as_str(),
         param["service"].as_str())?;
 
-    rpcenv.set_result_attrib("total", Value::from(count));
+    rpcenv["total"] = Value::from(count);
 
     Ok(json!(lines))
 }
diff --git a/src/api2/node/tasks.rs b/src/api2/node/tasks.rs
index 30d91313..77472a0b 100644
--- a/src/api2/node/tasks.rs
+++ b/src/api2/node/tasks.rs
@@ -156,7 +156,7 @@ fn extract_upid(param: &Value) -> Result<UPID, Error> {
 /// Read task log.
 async fn read_task_log(
     param: Value,
-    rpcenv: &mut dyn RpcEnvironment,
+    mut rpcenv: &mut dyn RpcEnvironment,
 ) -> Result<Value, Error> {
 
     let upid = extract_upid(&param)?;
@@ -199,11 +199,11 @@ async fn read_task_log(
         }
     }
 
-    rpcenv.set_result_attrib("total", Value::from(count));
+    rpcenv["total"] = Value::from(count);
 
     if test_status {
         let active = crate::server::worker_is_active(&upid).await?;
-        rpcenv.set_result_attrib("active", Value::from(active));
+        rpcenv["active"] = Value::from(active);
     }
 
     Ok(json!(lines))
@@ -304,7 +304,7 @@ pub fn list_tasks(
     errors: bool,
     running: bool,
     param: Value,
-    rpcenv: &mut dyn RpcEnvironment,
+    mut rpcenv: &mut dyn RpcEnvironment,
 ) -> Result<Vec<TaskListItem>, Error> {
 
     let username = rpcenv.get_user().unwrap();
@@ -382,7 +382,7 @@ pub fn list_tasks(
         if (result.len() as u64) < limit { result.push(entry); };
     }
 
-    rpcenv.set_result_attrib("total", Value::from(count));
+    rpcenv["total"] = Value::from(count);
 
     Ok(result)
 }
diff --git a/src/api2/reader/environment.rs b/src/api2/reader/environment.rs
index a5a5fe23..623be36a 100644
--- a/src/api2/reader/environment.rs
+++ b/src/api2/reader/environment.rs
@@ -1,8 +1,7 @@
 //use anyhow::{bail, format_err, Error};
 use std::sync::Arc;
-use std::collections::HashMap;
 
-use serde_json::Value;
+use serde_json::{json, Value};
 
 use proxmox::api::{RpcEnvironment, RpcEnvironmentType};
 
@@ -16,7 +15,7 @@ use crate::server::formatter::*;
 #[derive(Clone)]
 pub struct ReaderEnvironment {
     env_type: RpcEnvironmentType,
-    result_attributes: HashMap<String, Value>,
+    result_attributes: Value,
     user: String,
     pub debug: bool,
     pub formatter: &'static OutputFormatter,
@@ -37,7 +36,7 @@ impl ReaderEnvironment {
 
 
         Self {
-            result_attributes: HashMap::new(),
+            result_attributes: json!({}),
             env_type,
             user,
             worker,
@@ -61,12 +60,12 @@ impl ReaderEnvironment {
 
 impl RpcEnvironment for ReaderEnvironment {
 
-    fn set_result_attrib(&mut self, name: &str, value: Value) {
-        self.result_attributes.insert(name.into(), value);
+    fn result_attrib_mut(&mut self) -> &mut Value {
+        &mut self.result_attributes
     }
 
-    fn get_result_attrib(&self, name: &str) -> Option<&Value> {
-        self.result_attributes.get(name)
+    fn result_attrib(&self) -> &Value {
+        &self.result_attributes
     }
 
     fn env_type(&self) -> RpcEnvironmentType {
diff --git a/src/bin/proxmox-backup-manager.rs b/src/bin/proxmox-backup-manager.rs
index 756d3763..6369eb6a 100644
--- a/src/bin/proxmox-backup-manager.rs
+++ b/src/bin/proxmox-backup-manager.rs
@@ -262,11 +262,9 @@ fn list_network_devices(mut param: Value, rpcenv: &mut dyn RpcEnvironment) -> Re
         _ => unreachable!(),
     };
 
-    if let Some(changes) = rpcenv.get_result_attrib("changes") {
-        if let Some(diff) = changes.as_str() {
-            if output_format == "text" {
-                eprintln!("pending changes:\n{}\n", diff);
-            }
+    if let Value::String(ref diff) = rpcenv["changes"] {
+        if output_format == "text" {
+            eprintln!("pending changes:\n{}\n", diff);
         }
     }
 
@@ -339,10 +337,8 @@ fn pending_network_changes(mut param: Value, rpcenv: &mut dyn RpcEnvironment) ->
         _ => unreachable!(),
     };
 
-    if let Some(changes) = rpcenv.get_result_attrib("changes") {
-        if let Some(diff) = changes.as_str() {
-            println!("{}", diff);
-        }
+    if let Value::String(ref diff) = rpcenv["changes"] {
+        println!("{}", diff);
     }
 
     Ok(Value::Null)
diff --git a/src/server/environment.rs b/src/server/environment.rs
index 9e026997..10ff958c 100644
--- a/src/server/environment.rs
+++ b/src/server/environment.rs
@@ -1,19 +1,18 @@
-use std::collections::HashMap;
-use serde_json::Value;
+use serde_json::{json, Value};
 
 use proxmox::api::{RpcEnvironment, RpcEnvironmentType};
 
 /// Encapsulates information about the runtime environment
 pub struct RestEnvironment {
     env_type: RpcEnvironmentType,
-    result_attributes: HashMap<String, Value>,
+    result_attributes: Value,
     user: Option<String>,
 }
 
 impl RestEnvironment {
     pub fn new(env_type: RpcEnvironmentType) -> Self {
         Self {
-            result_attributes: HashMap::new(),
+            result_attributes: json!({}),
             user: None,
             env_type,
         }
@@ -22,12 +21,12 @@ impl RestEnvironment {
 
 impl RpcEnvironment for RestEnvironment {
 
-    fn set_result_attrib(&mut self, name: &str, value: Value) {
-        self.result_attributes.insert(name.into(), value);
+    fn result_attrib_mut (&mut self) -> &mut Value {
+        &mut self.result_attributes
     }
 
-    fn get_result_attrib(&self, name: &str) -> Option<&Value> {
-        self.result_attributes.get(name)
+    fn result_attrib(&self) -> &Value {
+        &self.result_attributes
     }
 
     fn env_type(&self) -> RpcEnvironmentType {
diff --git a/src/server/formatter.rs b/src/server/formatter.rs
index 47b9b998..8818e671 100644
--- a/src/server/formatter.rs
+++ b/src/server/formatter.rs
@@ -41,16 +41,13 @@ pub fn json_data_response(data: Value) -> Response<Body> {
 
 fn add_result_attributes(result: &mut Value, rpcenv: &dyn RpcEnvironment)
 {
-    if let Some(total) = rpcenv.get_result_attrib("total").and_then(|v| v.as_u64()) {
-        result["total"] = Value::from(total);
-    }
+    let attributes = match rpcenv.result_attrib().as_object() {
+        Some(attr) => attr,
+        None => return,
+    };
 
-    if let Some(active) = rpcenv.get_result_attrib("active").and_then(|v| v.as_bool()) {
-        result["active"] = Value::from(active);
-    }
-
-    if let Some(changes) = rpcenv.get_result_attrib("changes") {
-        result["changes"] = changes.clone();
+    for (key, value) in attributes {
+        result[key] = value.clone();
     }
 }