diff --git a/external/banana b/external/banana
index 787d34e..e8cf5d3 160000
--- a/external/banana
+++ b/external/banana
@@ -1 +1 @@
-Subproject commit 787d34ea6f616d3a37a09c7262c07d0ff1f0bef4
+Subproject commit e8cf5d31b6bb338ad6166abe5077c174901182da
diff --git a/src/Bot.cpp b/src/Bot.cpp
index 5945aae..594edf8 100644
--- a/src/Bot.cpp
+++ b/src/Bot.cpp
@@ -51,8 +51,7 @@ void Bot::notifyUser(UserId userId,
 	    "{}\n"
 	    "Дата: {} {}\n",
 	    caseNumber, caseUrl, item.status, item.date, item.time);
-	banana::api::send_message(agent_, {.chat_id = userId, .text = message, .parse_mode = "markdown"},
-	                          [](const auto&) {});
+	banana::api::send_message(agent_, {.chat_id = userId, .text = message, .parse_mode = "markdown"});
 }
 
 void Bot::getUpdates()
diff --git a/src/Bot.h b/src/Bot.h
index 90de005..9b32806 100644
--- a/src/Bot.h
+++ b/src/Bot.h
@@ -29,7 +29,7 @@ private:
 
 	LocalStorage& storage_;
 	bool& terminationFlag_;
-	banana::agent::beast_callback agent_;
+	banana::agent::beast_async_monadic agent_;
 	std::int64_t updatesOffset_ = 0;
 	std::map<banana::integer_t, BotSession> sessions_;
 };
diff --git a/src/BotSession.cpp b/src/BotSession.cpp
index 45453c5..c22a41d 100644
--- a/src/BotSession.cpp
+++ b/src/BotSession.cpp
@@ -7,7 +7,7 @@
 #include <banana/api.hpp>
 #include <fmt/core.h>
 
-BotSession::BotSession(banana::agent::beast_callback& agent,
+BotSession::BotSession(banana::agent::beast_async_monadic& agent,
                        banana::integer_t userId,
                        LocalStorage& storage)
     : agent_(agent), userId_(userId), storage_(storage)
diff --git a/src/BotSession.h b/src/BotSession.h
index a12f9c7..a259dc4 100644
--- a/src/BotSession.h
+++ b/src/BotSession.h
@@ -14,7 +14,9 @@ class Dialog;
 class BotSession final
 {
 public:
-	BotSession(banana::agent::beast_callback& agent, banana::integer_t userId, LocalStorage& storage);
+	BotSession(banana::agent::beast_async_monadic& agent,
+	           banana::integer_t userId,
+	           LocalStorage& storage);
 	~BotSession();
 
 	void processMessage(const banana::api::message_t& message);
@@ -30,7 +32,7 @@ private:
 	void processStartCommand();
 	void processStopCommand();
 
-	banana::agent::beast_callback& agent_;
+	banana::agent::beast_async_monadic& agent_;
 	banana::integer_t userId_;
 	LocalStorage& storage_;
 	std::unique_ptr<Dialog> activeDialog_;
diff --git a/src/DialogHelpers.h b/src/DialogHelpers.h
index e557e66..ca93a36 100644
--- a/src/DialogHelpers.h
+++ b/src/DialogHelpers.h
@@ -14,12 +14,12 @@ namespace statechart = boost::statechart;
 template <class MostDerived, class InitialState>
 struct StateMachine : public statechart::state_machine<MostDerived, InitialState>
 {
-	explicit StateMachine(banana::agent::beast_callback& agent, banana::integer_t userId)
+	explicit StateMachine(banana::agent::beast_async_monadic& agent, banana::integer_t userId)
 	    : agent(agent), userId(userId)
 	{
 	}
 
-	banana::agent::beast_callback& agent;
+	banana::agent::beast_async_monadic& agent;
 	banana::integer_t userId;
 };
 
diff --git a/src/SubscribeCaseDialog.cpp b/src/SubscribeCaseDialog.cpp
index a837ae1..88bc576 100644
--- a/src/SubscribeCaseDialog.cpp
+++ b/src/SubscribeCaseDialog.cpp
@@ -32,7 +32,9 @@ struct SubscriptionConfirmed : statechart::event<SubscriptionConfirmed> { };
 
 struct SubscribeCaseStateMachine : StateMachine<SubscribeCaseStateMachine, WaitingForInput>
 {
-	SubscribeCaseStateMachine(banana::agent::beast_callback& agent, long userId, LocalStorage& storage)
+	SubscribeCaseStateMachine(banana::agent::beast_async_monadic& agent,
+	                          long userId,
+	                          LocalStorage& storage)
 	    : StateMachine(agent, userId), storage(storage)
 	{
 	}
@@ -52,7 +54,7 @@ struct WaitingForInput : State<WaitingForInput, SubscribeCaseStateMachine>
 		auto& machine = context<SubscribeCaseStateMachine>();
 		std::string text = "Введите номер дела...";
 		banana::api::send_message(machine.agent,
-		                          {.chat_id = machine.userId, .text = std::move(text)}, [](auto) {});
+		                          {.chat_id = machine.userId, .text = std::move(text)});
 	}
 
 	statechart::result react(const NewMessageEvent& event)
@@ -70,8 +72,8 @@ struct WaitingForInput : State<WaitingForInput, SubscribeCaseStateMachine>
 			std::string text =
 			    "Некорректный формат номера дела!\n"
 			    "Попробуйте еще раз.";
-			banana::api::send_message(
-			    machine.agent, {.chat_id = machine.userId, .text = std::move(text)}, [](auto) {});
+			banana::api::send_message(machine.agent,
+			                          {.chat_id = machine.userId, .text = std::move(text)});
 			return discard_event();
 		}
 	}
@@ -108,8 +110,7 @@ struct GettingCaseDetails : State<GettingCaseDetails, SubscribeCaseStateMachine>
 
 			banana::api::send_message(
 			    machine.agent,
-			    {.chat_id = machine.userId, .text = std::move(text), .reply_markup = keyboard},
-			    [](auto) {});
+			    {.chat_id = machine.userId, .text = std::move(text), .reply_markup = keyboard});
 
 			post_event(CaseDetailsFetched());
 		}
@@ -139,14 +140,8 @@ struct WaitingForConfirmation : State<WaitingForConfirmation, SubscribeCaseState
 		{
 			if (event.query.message)
 				banana::api::edit_message_reply_markup(
-				    machine.agent,
-				    {.chat_id = event.query.message->chat.id,
-				     .message_id = event.query.message->message_id},
-				    [](banana::expected<banana::variant_t<banana::api::message_t, banana::boolean_t>> result)
-				    {
-					    if (!result)
-						    LOGE(dialog, result.error());
-				    });
+				    machine.agent, {.chat_id = event.query.message->chat.id,
+				                    .message_id = event.query.message->message_id});
 
 			if (*event.query.data == "yes")
 			{
@@ -174,7 +169,7 @@ struct Subscribed : State<Subscribed, SubscribeCaseStateMachine, true>
 
 /////////////////////////////////////////////////////////////////////////////
 
-SubscribeCaseDialog::SubscribeCaseDialog(banana::agent::beast_callback& agent,
+SubscribeCaseDialog::SubscribeCaseDialog(banana::agent::beast_async_monadic& agent,
                                          banana::integer_t userId,
                                          LocalStorage& storage)
     : Dialog(userId, "SubscribeCase"),
diff --git a/src/SubscribeCaseDialog.h b/src/SubscribeCaseDialog.h
index c936f7d..bc4f86a 100644
--- a/src/SubscribeCaseDialog.h
+++ b/src/SubscribeCaseDialog.h
@@ -11,7 +11,7 @@ struct SubscribeCaseStateMachine;
 class SubscribeCaseDialog : public Dialog
 {
 public:
-	SubscribeCaseDialog(banana::agent::beast_callback& agent,
+	SubscribeCaseDialog(banana::agent::beast_async_monadic& agent,
 	                    banana::integer_t userId,
 	                    LocalStorage& storage);
 	~SubscribeCaseDialog() override;