diff --git a/CHANGELOG.md b/CHANGELOG.md
index eb9c68ec398c..57b9cb892c53 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,7 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
--
+- PATCH requests from cvat-core submit only changed fields (<https://github.com/openvinotoolkit/cvat/pull/2445>)
 
 ### Deprecated
 
diff --git a/cvat-core/package-lock.json b/cvat-core/package-lock.json
index 52e1e13811d5..10541c46426a 100644
--- a/cvat-core/package-lock.json
+++ b/cvat-core/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "cvat-core",
-  "version": "3.9.0",
+  "version": "3.9.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/cvat-core/package.json b/cvat-core/package.json
index 84140ddef9a3..bbb559549bcd 100644
--- a/cvat-core/package.json
+++ b/cvat-core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "cvat-core",
-  "version": "3.9.0",
+  "version": "3.9.1",
   "description": "Part of Computer Vision Tool which presents an interface for client-side integration",
   "main": "babel.config.js",
   "scripts": {
diff --git a/cvat-core/src/session.js b/cvat-core/src/session.js
index 26483cc19af8..fba1a2ab1e0b 100644
--- a/cvat-core/src/session.js
+++ b/cvat-core/src/session.js
@@ -674,6 +674,11 @@
                 task: undefined,
             };
 
+            let updatedFields = {
+                assignee: false,
+                status: false,
+            };
+
             for (const property in data) {
                 if (Object.prototype.hasOwnProperty.call(data, property)) {
                     if (property in initialData) {
@@ -715,6 +720,7 @@
                             if (assignee !== null && !(assignee instanceof User)) {
                                 throw new ArgumentError('Value must be a user instance');
                             }
+                            updatedFields.assignee = true;
                             data.assignee = assignee;
                         },
                     },
@@ -743,6 +749,7 @@
                                 );
                             }
 
+                            updatedFields.status = true;
                             data.status = status;
                         },
                     },
@@ -776,6 +783,12 @@
                     task: {
                         get: () => data.task,
                     },
+                    __updatedFields: {
+                        get: () => updatedFields,
+                        set: (fields) => {
+                            updatedFields = fields;
+                        },
+                    },
                 }),
             );
 
@@ -879,6 +892,13 @@
                 use_cache: undefined,
             };
 
+            let updatedFields = {
+                name: false,
+                assignee: false,
+                bug_tracker: false,
+                labels: false,
+            };
+
             for (const property in data) {
                 if (Object.prototype.hasOwnProperty.call(data, property) && property in initialData) {
                     data[property] = initialData[property];
@@ -948,6 +968,7 @@
                             if (!value.trim().length) {
                                 throw new ArgumentError('Value must not be empty');
                             }
+                            updatedFields.name = true;
                             data.name = value;
                         },
                     },
@@ -1006,6 +1027,7 @@
                             if (assignee !== null && !(assignee instanceof User)) {
                                 throw new ArgumentError('Value must be a user instance');
                             }
+                            updatedFields.assignee = true;
                             data.assignee = assignee;
                         },
                     },
@@ -1039,6 +1061,7 @@
                     bugTracker: {
                         get: () => data.bug_tracker,
                         set: (tracker) => {
+                            updatedFields.bug_tracker = true;
                             data.bug_tracker = tracker;
                         },
                     },
@@ -1145,6 +1168,7 @@
                                 }
                             }
 
+                            updatedFields.labels = true;
                             data.labels = [...labels];
                         },
                     },
@@ -1311,6 +1335,12 @@
                     dataChunkType: {
                         get: () => data.data_compressed_chunk_type,
                     },
+                    __updatedFields: {
+                        get: () => updatedFields,
+                        set: (fields) => {
+                            updatedFields = fields;
+                        },
+                    },
                 }),
             );
 
@@ -1443,12 +1473,30 @@
     Job.prototype.save.implementation = async function () {
         // TODO: Add ability to change an assignee
         if (this.id) {
-            const jobData = {
-                status: this.status,
-                assignee_id: this.assignee ? this.assignee.id : null,
-            };
+            const jobData = {};
+
+            for (const [field, isUpdated] of Object.entries(this.__updatedFields)) {
+                if (isUpdated) {
+                    switch (field) {
+                    case 'status':
+                        jobData.status = this.status;
+                        break;
+                    case 'assignee':
+                        jobData.assignee_id = this.assignee ? this.assignee.id : null;
+                        break;
+                    default:
+                        break;
+                    }
+                }
+            }
 
             await serverProxy.jobs.saveJob(this.id, jobData);
+
+            this.__updatedFields = {
+                status: false,
+                assignee: false,
+            };
+
             return this;
         }
 
@@ -1653,14 +1701,38 @@
         // TODO: Add ability to change an owner and an assignee
         if (typeof this.id !== 'undefined') {
             // If the task has been already created, we update it
-            const taskData = {
-                assignee_id: this.assignee ? this.assignee.id : null,
-                name: this.name,
-                bug_tracker: this.bugTracker,
-                labels: [...this.labels.map((el) => el.toJSON())],
-            };
+            const taskData = {};
+
+            for (const [field, isUpdated] of Object.entries(this.__updatedFields)) {
+                if (isUpdated) {
+                    switch (field) {
+                    case 'assignee':
+                        taskData.assignee_id = this.assignee ? this.assignee.id : null;
+                        break;
+                    case 'name':
+                        taskData.name = this.name;
+                        break;
+                    case 'bug_tracker':
+                        taskData.bug_tracker = this.bugTracker;
+                        break;
+                    case 'labels':
+                        taskData.labels = [...this.labels.map((el) => el.toJSON())];
+                        break;
+                    default:
+                        break;
+                    }
+                }
+            }
 
             await serverProxy.tasks.saveTask(this.id, taskData);
+
+            this.updatedFields = {
+                assignee: false,
+                name: false,
+                bugTracker: false,
+                labels: false,
+            };
+
             return this;
         }