diff --git a/.gitea/workflows/release.yml b/.gitea/workflows/release.yml
index b87a692..45da9c3 100644
--- a/.gitea/workflows/release.yml
+++ b/.gitea/workflows/release.yml
@@ -89,6 +89,18 @@ jobs:
             throw "Archive not found: $archivePath"
           }
 
+      - name: Generate SHA256 checksum
+        if: env.CONTINUE == 'true'
+        shell: powershell
+        run: |
+          $version = "${{ steps.extract_version.outputs.version }}"
+          $archiveName = "AnabasisManager-$version.zip"
+          $archivePath = "dist/$archiveName"
+          $checksumPath = "dist/$archiveName.sha256"
+          $hash = (Get-FileHash -Path $archivePath -Algorithm SHA256).Hash.ToLower()
+          "$hash  $archiveName" | Set-Content -Path $checksumPath -Encoding UTF8
+          Write-Host "Checksum created: $checksumPath"
+
       - name: Configure git identity
         if: env.CONTINUE == 'true'
         shell: powershell
@@ -118,3 +130,4 @@ jobs:
             Desktop release v${{ steps.extract_version.outputs.version }}
           files: |
             dist/AnabasisManager-${{ steps.extract_version.outputs.version }}.zip
+            dist/AnabasisManager-${{ steps.extract_version.outputs.version }}.zip.sha256
diff --git a/main.py b/main.py
index 33a6d81..af955ca 100644
--- a/main.py
+++ b/main.py
@@ -8,6 +8,7 @@ import time
 import auth_webview
 import os
 import re
+import hashlib
 import subprocess
 import threading
 import tempfile
@@ -357,13 +358,30 @@ class UpdateChecker(QObject):
         html_url = release_data.get("html_url") or releases_url
         assets = release_data.get("assets") or []
         download_url = ""
+        download_name = ""
+        checksum_url = ""
         for asset in assets:
             url = asset.get("browser_download_url", "")
             if url.lower().endswith(".zip"):
                 download_url = url
+                download_name = asset.get("name", "")
                 break
         if not download_url and assets:
             download_url = assets[0].get("browser_download_url", "")
+            download_name = assets[0].get("name", "")
+
+        for asset in assets:
+            name = asset.get("name", "").lower()
+            if not name:
+                continue
+            is_checksum_asset = name.endswith(".sha256") or name.endswith(".sha256.txt") or name in ("checksums.txt", "sha256sums.txt")
+            if not is_checksum_asset:
+                continue
+            if download_name and (download_name.lower() in name or name in (f"{download_name.lower()}.sha256", f"{download_name.lower()}.sha256.txt")):
+                checksum_url = asset.get("browser_download_url", "")
+                break
+            if not checksum_url:
+                checksum_url = asset.get("browser_download_url", "")
 
         self.check_finished.emit(
             {
@@ -373,6 +391,8 @@ class UpdateChecker(QObject):
                 "latest_tag": latest_tag,
                 "release_url": html_url,
                 "download_url": download_url,
+                "download_name": download_name,
+                "checksum_url": checksum_url,
                 "has_update": _is_newer_version(latest_version, self.current_version),
             }
         )
@@ -707,9 +727,11 @@ class VkChatManager(QMainWindow):
 
             clicked = message_box.clickedButton()
             download_url = result.get("download_url")
+            checksum_url = result.get("checksum_url")
+            download_name = result.get("download_name")
             release_url = result.get("release_url")
             if clicked is update_now_button and download_url:
-                if not self._start_auto_update(download_url, latest_version):
+                if not self._start_auto_update(download_url, latest_version, checksum_url, download_name):
                     if release_url:
                         QDesktopServices.openUrl(QUrl(release_url))
                 return
@@ -754,6 +776,53 @@ class VkChatManager(QMainWindow):
             with open(destination_path, "wb") as f:
                 shutil.copyfileobj(response, f)
 
+    def _download_update_text(self, url):
+        request = urllib.request.Request(
+            url,
+            headers={"User-Agent": "AnabasisManager-Updater"},
+        )
+        with urllib.request.urlopen(request, timeout=30) as response:
+            return response.read().decode("utf-8", errors="replace")
+
+    @staticmethod
+    def _sha256_file(path):
+        digest = hashlib.sha256()
+        with open(path, "rb") as f:
+            for chunk in iter(lambda: f.read(1024 * 1024), b""):
+                digest.update(chunk)
+        return digest.hexdigest().lower()
+
+    @staticmethod
+    def _extract_sha256_from_text(checksum_text, target_file_name):
+        target = (target_file_name or "").strip().lower()
+        for raw_line in checksum_text.splitlines():
+            line = raw_line.strip()
+            if not line:
+                continue
+            match = re.search(r"\b([A-Fa-f0-9]{64})\b", line)
+            if not match:
+                continue
+            checksum = match.group(1).lower()
+            if not target:
+                return checksum
+            line_lower = line.lower()
+            if target in line_lower:
+                return checksum
+            if os.path.basename(target) in line_lower:
+                return checksum
+        return ""
+
+    def _verify_update_checksum(self, zip_path, checksum_url, download_name):
+        if not checksum_url:
+            raise RuntimeError("В релизе нет файла SHA256. Автообновление остановлено.")
+        checksum_text = self._download_update_text(checksum_url)
+        expected_hash = self._extract_sha256_from_text(checksum_text, download_name or os.path.basename(zip_path))
+        if not expected_hash:
+            raise RuntimeError("Не удалось найти SHA256 для архива обновления.")
+        actual_hash = self._sha256_file(zip_path)
+        if actual_hash != expected_hash:
+            raise RuntimeError("SHA256 не совпадает, обновление отменено.")
+
     def _locate_extracted_root(self, extracted_dir):
         entries = []
         for name in os.listdir(extracted_dir):
@@ -788,7 +857,7 @@ class VkChatManager(QMainWindow):
             f.write("\r\n".join(script_lines) + "\r\n")
         return script_path
 
-    def _start_auto_update(self, download_url, latest_version):
+    def _start_auto_update(self, download_url, latest_version, checksum_url="", download_name=""):
         if os.name != "nt":
             QMessageBox.information(
                 self,
@@ -814,6 +883,7 @@ class VkChatManager(QMainWindow):
         unpack_dir = os.path.join(work_dir, "extracted")
         try:
             self._download_update_archive(download_url, zip_path)
+            self._verify_update_checksum(zip_path, checksum_url, download_name)
             os.makedirs(unpack_dir, exist_ok=True)
             with zipfile.ZipFile(zip_path, "r") as archive:
                 archive.extractall(unpack_dir)
diff --git a/tests/test_auth_relogin_smoke.py b/tests/test_auth_relogin_smoke.py
index f5090b8..6562190 100644
--- a/tests/test_auth_relogin_smoke.py
+++ b/tests/test_auth_relogin_smoke.py
@@ -44,7 +44,8 @@ class AuthReloginSmokeTests(unittest.TestCase):
         self.assertIn("def check_for_updates(self, silent_no_updates=False):", self.source)
         self.assertIn("class UpdateChecker(QObject):", self.source)
         self.assertIn('message_box.addButton("Обновить сейчас", QMessageBox.AcceptRole)', self.source)
-        self.assertIn("def _start_auto_update(self, download_url, latest_version):", self.source)
+        self.assertIn("def _start_auto_update(self, download_url, latest_version, checksum_url=\"\", download_name=\"\"):", self.source)
+        self.assertIn("def _verify_update_checksum(self, zip_path, checksum_url, download_name):", self.source)
 
 
 if __name__ == "__main__":