diff --git a/td/generate/scheme/td_api.tl b/td/generate/scheme/td_api.tl
index cc7380759..6b1bc5173 100644
--- a/td/generate/scheme/td_api.tl
+++ b/td/generate/scheme/td_api.tl
@@ -3411,6 +3411,9 @@ getLanguagePackInfo language_pack_id:string = LanguagePackInfo;
 //@description Returns strings from a language pack in the current localization target by their keys @language_pack_id Language pack identifier of the strings to be returned @keys Language pack keys of the strings to be returned; leave empty to request all available strings
 getLanguagePackStrings language_pack_id:string keys:vector<string> = LanguagePackStrings;
 
+//@description Fetches latest versions of all strings from a language pack in the current localization target from the server. This method doesn't need to be called explicitly for the current used/base language packs @language_pack_id Language pack identifier
+synchronizeLanguagePack language_pack_id:string = Ok;
+
 //@description Adds a custom server language pack to the list of installed language packs in current localization target @language_pack_id Identifier of a language pack to be added; may be different from a name that is used in an "https://t.me/setlanguage/" link
 addCustomServerLanguagePack language_pack_id:string = Ok;
 
@@ -3423,7 +3426,7 @@ editCustomLanguagePackInfo info:languagePackInfo = Ok;
 //@description Adds, edits or deletes a string in a custom local language pack @language_pack_id Identifier of a previously added custom local language pack in the current localization target @new_string New language pack string
 setCustomLanguagePackString language_pack_id:string new_string:languagePackString = Ok;
 
-//@description Deletes all information about a language pack in the current localization target. The language pack that is currently in use (including base language pack) can't be deleted @language_pack_id Identifier of the language pack to delete
+//@description Deletes all information about a language pack in the current localization target. The language pack which is currently in use (including base language pack) or is being synchronized can't be deleted @language_pack_id Identifier of the language pack to delete
 deleteLanguagePack language_pack_id:string = Ok;
 
 
diff --git a/td/generate/scheme/td_api.tlo b/td/generate/scheme/td_api.tlo
index be5a80c30..73005c142 100644
Binary files a/td/generate/scheme/td_api.tlo and b/td/generate/scheme/td_api.tlo differ
diff --git a/td/telegram/LanguagePackManager.cpp b/td/telegram/LanguagePackManager.cpp
index 6943242c1..c082f073e 100644
--- a/td/telegram/LanguagePackManager.cpp
+++ b/td/telegram/LanguagePackManager.cpp
@@ -51,6 +51,7 @@ struct LanguagePackManager::Language {
   bool is_full_ = false;
   bool was_loaded_full_ = false;
   bool has_get_difference_query_ = false;
+  vector<Promise<Unit>> get_difference_queries_;
   std::unordered_map<string, string> ordinary_strings_;
   std::unordered_map<string, PluralizedString> pluralized_strings_;
   std::unordered_set<string> deleted_strings_;
@@ -299,11 +300,18 @@ void LanguagePackManager::on_language_pack_version_changed(bool is_base, int32 n
 
   LOG(INFO) << (is_base ? "Base" : "Main") << " language pack " << language_code << " vesrion has changed to "
             << new_version;
+  send_language_get_difference_query(language, language_code, version, Auto());
+}
+
+void LanguagePackManager::send_language_get_difference_query(Language *language, const string &language_code,
+                                                             int32 version, Promise<Unit> &&promise) {
   std::lock_guard<std::mutex> lock(language->mutex_);
+  language->get_difference_queries_.push_back(std::move(promise));
   if (language->has_get_difference_query_) {
     return;
   }
 
+  CHECK(language->get_difference_queries_.size() == 1);
   language->has_get_difference_query_ = true;
   auto request_promise =
       PromiseCreator::lambda([actor_id = actor_id(this), language_pack = language_pack_, language_code,
@@ -311,7 +319,7 @@ void LanguagePackManager::on_language_pack_version_changed(bool is_base, int32 n
         auto r_result = fetch_result<telegram_api::langpack_getDifference>(std::move(r_query));
         if (r_result.is_error()) {
           send_closure(actor_id, &LanguagePackManager::on_failed_get_difference, std::move(language_pack),
-                       std::move(language_code));
+                       std::move(language_code), r_result.move_as_error());
           return;
         }
 
@@ -1028,6 +1036,27 @@ void LanguagePackManager::load_empty_language_pack(const string &language_code)
   get_language_pack_strings(language_code, vector<string>(), Auto());
 }
 
+void LanguagePackManager::synchronize_language_pack(string language_code, Promise<Unit> promise) {
+  if (!check_language_code_name(language_code) || language_code.empty()) {
+    return promise.set_error(Status::Error(400, "Language pack ID is invalid"));
+  }
+  if (language_pack_.empty()) {
+    return promise.set_error(Status::Error(400, "Option \"localization_target\" needs to be set first"));
+  }
+  if (is_custom_language_code(language_code)) {
+    return promise.set_value(Unit());
+  }
+
+  Language *language = add_language(database_, language_pack_, language_code);
+  load_language_strings(database_, language, vector<string>());
+
+  int32 version = language->version_.load();
+  if (version == -1) {
+    version = 0;
+  }
+  send_language_get_difference_query(language, language_code, version, std::move(promise));
+}
+
 static td_api::object_ptr<td_api::LanguagePackStringValue> copy_language_pack_string_value(
     const td_api::LanguagePackStringValue *value) {
   switch (value->get_id()) {
@@ -1205,7 +1234,7 @@ void LanguagePackManager::on_get_language_pack_strings(
     int32 key_count_delta = 0;
     if (language->version_ < version || !keys.empty()) {
       vector<td_api::object_ptr<td_api::languagePackString>> strings;
-      if (language->version_ < version && !(is_diff && language->version_ == -1)) {
+      if (language->version_ < version) {
         LOG(INFO) << "Set language pack " << language_code << " version to " << version;
         language->version_ = version;
         new_database_version = version;
@@ -1312,10 +1341,18 @@ void LanguagePackManager::on_get_language_pack_strings(
 
   if (is_diff) {
     CHECK(language != nullptr);
-    std::lock_guard<std::mutex> lock(language->mutex_);
-    if (language->has_get_difference_query_) {
-      language->has_get_difference_query_ = false;
-      is_version_changed = true;
+    vector<Promise<Unit>> get_difference_queries;
+    {
+      std::lock_guard<std::mutex> lock(language->mutex_);
+      if (language->has_get_difference_query_) {
+        language->has_get_difference_query_ = false;
+        get_difference_queries = std::move(language->get_difference_queries_);
+        reset_to_empty(language->get_difference_queries_);
+        is_version_changed = true;
+      }
+    }
+    for (auto &query : get_difference_queries) {
+      query.set_value(Unit());
     }
   }
   if (is_version_changed && language_pack == language_pack_ &&
@@ -1329,15 +1366,26 @@ void LanguagePackManager::on_get_language_pack_strings(
   }
 }
 
-void LanguagePackManager::on_failed_get_difference(string language_pack, string language_code) {
+void LanguagePackManager::on_failed_get_difference(string language_pack, string language_code, Status error) {
   Language *language = get_language(database_, language_pack, language_code);
   CHECK(language != nullptr);
-  std::lock_guard<std::mutex> lock(language->mutex_);
-  if (language->has_get_difference_query_) {
-    language->has_get_difference_query_ = false;
-    if (language_pack == language_pack_ && (language_code == language_code_ || language_code == base_language_code_)) {
-      send_closure_later(actor_id(this), &LanguagePackManager::on_language_pack_version_changed,
-                         language_code != language_code_, -1);
+  vector<Promise<Unit>> get_difference_queries;
+  {
+    std::lock_guard<std::mutex> lock(language->mutex_);
+    if (language->has_get_difference_query_) {
+      language->has_get_difference_query_ = false;
+      if (language_pack == language_pack_ &&
+          (language_code == language_code_ || language_code == base_language_code_)) {
+        send_closure_later(actor_id(this), &LanguagePackManager::on_language_pack_version_changed,
+                           language_code != language_code_, -1);
+      }
+      get_difference_queries = std::move(language->get_difference_queries_);
+      reset_to_empty(language->get_difference_queries_);
+    }
+  }
+  for (auto &query : get_difference_queries) {
+    if (query) {
+      query.set_error(error.clone());
     }
   }
 }
diff --git a/td/telegram/LanguagePackManager.h b/td/telegram/LanguagePackManager.h
index 9beee6d2c..169388fe4 100644
--- a/td/telegram/LanguagePackManager.h
+++ b/td/telegram/LanguagePackManager.h
@@ -62,6 +62,8 @@ class LanguagePackManager : public NetQueryCallback {
                                                                      const string &language_pack,
                                                                      const string &language_code, const string &key);
 
+  void synchronize_language_pack(string language_code, Promise<Unit> promise);
+
   void on_update_language_pack(tl_object_ptr<telegram_api::langPackDifference> difference);
 
   void add_custom_server_language(string language_code, Promise<Unit> &&promise);
@@ -163,7 +165,10 @@ class LanguagePackManager : public NetQueryCallback {
   void on_get_all_language_pack_strings(string language_pack, string language_code,
                                         Result<td_api::object_ptr<td_api::languagePackStrings>> r_strings);
 
-  void on_failed_get_difference(string language_pack, string language_code);
+  void send_language_get_difference_query(Language *language, const string &language_code, int32 version,
+                                          Promise<Unit> &&promise);
+
+  void on_failed_get_difference(string language_pack, string language_code, Status error);
 
   void on_get_language_info(const string &language_pack, td_api::languagePackInfo *language_pack_info);
 
diff --git a/td/telegram/Td.cpp b/td/telegram/Td.cpp
index 3102d1d2a..a98c9e50e 100644
--- a/td/telegram/Td.cpp
+++ b/td/telegram/Td.cpp
@@ -3189,6 +3189,7 @@ bool Td::is_preauthentication_request(int32 id) {
     case td_api::processPushNotification::ID:
     case td_api::getLocalizationTargetInfo::ID:
     case td_api::getLanguagePackStrings::ID:
+    case td_api::synchronizeLanguagePack::ID:
     case td_api::setCustomLanguagePack::ID:
     case td_api::editCustomLanguagePackInfo::ID:
     case td_api::setCustomLanguagePackString::ID:
@@ -6263,6 +6264,14 @@ void Td::on_request(uint64 id, td_api::getLanguagePackStrings &request) {
                std::move(request.language_pack_id_), std::move(request.keys_), std::move(promise));
 }
 
+void Td::on_request(uint64 id, td_api::synchronizeLanguagePack &request) {
+  CHECK_IS_USER();
+  CLEAN_INPUT_STRING(request.language_pack_id_);
+  CREATE_OK_REQUEST_PROMISE();
+  send_closure(language_pack_manager_, &LanguagePackManager::synchronize_language_pack,
+               std::move(request.language_pack_id_), std::move(promise));
+}
+
 void Td::on_request(uint64 id, td_api::addCustomServerLanguagePack &request) {
   CHECK_IS_USER();
   CLEAN_INPUT_STRING(request.language_pack_id_);
diff --git a/td/telegram/Td.h b/td/telegram/Td.h
index d7e2f051e..8ed7d8ce0 100644
--- a/td/telegram/Td.h
+++ b/td/telegram/Td.h
@@ -816,6 +816,8 @@ class Td final : public NetQueryCallback {
 
   void on_request(uint64 id, td_api::getLanguagePackStrings &request);
 
+  void on_request(uint64 id, td_api::synchronizeLanguagePack &request);
+
   void on_request(uint64 id, td_api::addCustomServerLanguagePack &request);
 
   void on_request(uint64 id, td_api::setCustomLanguagePack &request);
diff --git a/td/telegram/cli.cpp b/td/telegram/cli.cpp
index 7da646741..8ec10d1a6 100644
--- a/td/telegram/cli.cpp
+++ b/td/telegram/cli.cpp
@@ -1861,6 +1861,9 @@ class CliClient final : public Actor {
       std::tie(language_code, key) = split(args);
       send_request(td_api::make_object<td_api::getLanguagePackString>(language_database_path, language_pack,
                                                                       language_code, key));
+    } else if (op == "synclp") {
+      string language_code = args;
+      send_request(td_api::make_object<td_api::synchronizeLanguagePack>(language_code));
     } else if (op == "acslp") {
       string language_code = args;
       send_request(td_api::make_object<td_api::addCustomServerLanguagePack>(language_code));