diff --git a/lib/incredis b/lib/incredis
index c4f8462..a8a27b3 160000
--- a/lib/incredis
+++ b/lib/incredis
@@ -1 +1 @@
-Subproject commit c4f84622fe664a13dbe0fbbf928fe116eacfedbc
+Subproject commit a8a27b307f5cf516f967ea1e5321587ad6df0b7e
diff --git a/src/kamokan_impl/error_response.cpp b/src/kamokan_impl/error_response.cpp
index 7e456dd..0c64fb4 100644
--- a/src/kamokan_impl/error_response.cpp
+++ b/src/kamokan_impl/error_response.cpp
@@ -20,8 +20,8 @@
 #include "cgi_env.hpp"
 #include "sprout/array/array.hpp"
 #include "string_lengths.hpp"
+#include "incredis/int_conv.hpp"
 #include <boost/algorithm/string/replace.hpp>
-#include <boost/lexical_cast.hpp>
 #include <ciso646>
 #include <string>
 #include <cassert>
@@ -40,7 +40,7 @@ namespace kamokan {
 		using tawashi::ErrorReasons;
 
 		auto get = cgi_env().query_string_split();
-		const int reason_int = boost::lexical_cast<int>(get["reason"]);
+		const int reason_int = redis::int_conv<int>(get["reason"]);
 		ErrorReasons reason_code(ErrorReasons::UnknownReason);
 		if (reason_int >= 0 and reason_int < ErrorReasons::_size())
 			reason_code = ErrorReasons::_from_integral(reason_int);
diff --git a/src/kamokan_impl/response.cpp b/src/kamokan_impl/response.cpp
index c2a86a7..3bc7366 100644
--- a/src/kamokan_impl/response.cpp
+++ b/src/kamokan_impl/response.cpp
@@ -18,7 +18,6 @@
 #include "response.hpp"
 #include "settings_bag.hpp"
 #include "duckhandy/stringize.h"
-#include "duckhandy/lexical_cast.hpp"
 #include "pathname/pathname.hpp"
 #include "highlight_functions.hpp"
 #include "cgi_env.hpp"
diff --git a/src/kamokan_impl/settings_bag.cpp b/src/kamokan_impl/settings_bag.cpp
index b72b661..661e45c 100644
--- a/src/kamokan_impl/settings_bag.cpp
+++ b/src/kamokan_impl/settings_bag.cpp
@@ -16,7 +16,6 @@
  */
 
 #include "settings_bag.hpp"
-#include "duckhandy/lexical_cast.hpp"
 #include "spdlog.hpp"
 #include <ciso646>
 #include <cassert>
diff --git a/src/kamokan_impl/storage.cpp b/src/kamokan_impl/storage.cpp
index a3c8f6a..7faa525 100644
--- a/src/kamokan_impl/storage.cpp
+++ b/src/kamokan_impl/storage.cpp
@@ -24,6 +24,7 @@
 #include "string_conv.hpp"
 #include "lua_scripts_for_redis.hpp"
 #include "redis_to_error_reason.hpp"
+#include "incredis/int_conv.hpp"
 #include <cassert>
 #include <ciso646>
 #include <string>
@@ -140,7 +141,6 @@ namespace kamokan {
 	) const {
 		using tawashi::ErrorReasons;
 		using boost::string_view;
-		using dhandy::lexical_cast;
 
 		if (not is_connected())
 			return make_submission_result(ErrorReasons::RedisDisconnected);
@@ -153,12 +153,12 @@ namespace kamokan {
 		{
 			string_view paste_counter_token(TOKEN_PREFIX "paste_counter");
 			std::string prefix(g_token_prefix);
-			const auto expiry = lexical_cast<std::string>(parExpiry);
+			const auto expiry = redis::int_to_ary_dec(parExpiry);
 			const auto self_des = string_view(parSelfDestruct ? "1" : "0");
 			const auto flood_wait = m_settings->as<string_view>("resubmit_wait");
 			retrieve.run(batch,
 				std::make_tuple(paste_counter_token, prefix + parRemoteIP),
-				std::make_tuple(prefix, parText, expiry, parLang, self_des, flood_wait)
+				std::make_tuple(prefix, parText, expiry.to<boost::string_view>(), parLang, self_des, flood_wait)
 			);
 		}
 		auto raw_replies = batch.replies();
@@ -216,7 +216,7 @@ namespace kamokan {
 			using std::string;
 			using boost::make_optional;
 			retval.error =
-				make_optional<string>(string(get_error_string(raw_replies.front()).message()));
+				make_optional<string>(get_error_string(raw_replies.front()).message());
 			return retval;
 		}
 		auto pastie_reply = get_array(raw_replies.front());
diff --git a/src/kamokan_impl/string_conv.hpp b/src/kamokan_impl/string_conv.hpp
index b72609b..f95cad7 100644
--- a/src/kamokan_impl/string_conv.hpp
+++ b/src/kamokan_impl/string_conv.hpp
@@ -17,8 +17,8 @@
 
 #pragma once
 
-#include "duckhandy/lexical_cast.hpp"
 #include <boost/utility/string_view.hpp>
+#include <boost/lexical_cast.hpp>
 #include <type_traits>
 #include <cstdint>
 #include <string>
@@ -41,19 +41,19 @@ namespace kamokan {
 	template <>
 	[[gnu::pure,gnu::always_inline]] inline
 	uint16_t string_conv (boost::string_view parStr) {
-		return dhandy::lexical_cast<uint16_t>(parStr);
+		return boost::lexical_cast<uint16_t>(parStr);
 	}
 
 	template <>
 	[[gnu::pure,gnu::always_inline]] inline
 	uint32_t string_conv (boost::string_view parStr) {
-		return dhandy::lexical_cast<uint32_t>(parStr);
+		return boost::lexical_cast<uint32_t>(parStr);
 	}
 
 	template <>
 	[[gnu::pure,gnu::always_inline]] inline
 	long long string_conv (boost::string_view parStr) {
-		return dhandy::lexical_cast<long long>(parStr);
+		return boost::lexical_cast<long long>(parStr);
 	}
 
 	template <>
diff --git a/src/kamokan_impl/submit_paste_response.cpp b/src/kamokan_impl/submit_paste_response.cpp
index 0f24efd..575166b 100644
--- a/src/kamokan_impl/submit_paste_response.cpp
+++ b/src/kamokan_impl/submit_paste_response.cpp
@@ -20,14 +20,13 @@
 #include "cgi_post.hpp"
 #include "settings_bag.hpp"
 #include "duckhandy/compatibility.h"
-#include "duckhandy/lexical_cast.hpp"
+#include "incredis/int_conv.hpp"
 #include "tawashi_exception.hpp"
 #include "ip_utils.hpp"
 #include "string_conv.hpp"
 #include "highlight_functions.hpp"
 #include <ciso646>
 #include <algorithm>
-#include <boost/lexical_cast.hpp>
 #include <cstdint>
 #include <spdlog/spdlog.h>
 #include <utility>
@@ -152,9 +151,7 @@ namespace kamokan {
 			}
 		}
 
-		//TODO: replace boost's lexical_cast with mine when I have some checks
-		//over invalid inputs
-		const uint32_t duration_int = std::max(std::min((duration.empty() ? 86400U : boost::lexical_cast<uint32_t>(duration)), 2628000U), 1U);
+		const uint32_t duration_int = std::max(std::min((duration.empty() ? 86400U : redis::int_conv<uint32_t>(duration)), 2628000U), 1U);
 		StringOrHeader submit_result = submit_to_storage(pastie, duration_int, m_local->pastie_lang, self_destruct);
 		const boost::optional<std::string>& token = submit_result.first;
 
diff --git a/src/tawashi/http_header.cpp b/src/tawashi/http_header.cpp
index ad7710b..eba1a47 100644
--- a/src/tawashi/http_header.cpp
+++ b/src/tawashi/http_header.cpp
@@ -16,7 +16,6 @@
  */
 
 #include "http_header.hpp"
-#include "duckhandy/lexical_cast.hpp"
 #include "duckhandy/sequence_bt.hpp"
 #include "sprout/array/array.hpp"
 #include <utility>
diff --git a/src/tawashi/ip_utils.cpp b/src/tawashi/ip_utils.cpp
index 7ac25d9..2164e0c 100644
--- a/src/tawashi/ip_utils.cpp
+++ b/src/tawashi/ip_utils.cpp
@@ -16,8 +16,6 @@
  */
 
 #include "ip_utils.hpp"
-#include "duckhandy/lexical_cast.hpp"
-#include "duckhandy/int_to_string_ary.hpp"
 #include "cgi_env.hpp"
 #include "tawashi_config.h"
 #include <spdlog/spdlog.h>
diff --git a/test/simulation/test_submit_pastie.cpp b/test/simulation/test_submit_pastie.cpp
index 5f29012..6fbc465 100644
--- a/test/simulation/test_submit_pastie.cpp
+++ b/test/simulation/test_submit_pastie.cpp
@@ -25,9 +25,9 @@
 #include "cgi_env.hpp"
 #include "cgi_post.hpp"
 #include "fake_storage.hpp"
+#include "duckhandy/int_conv.hpp"
 #include <spdlog/spdlog.h>
 #include <sstream>
-#include <boost/lexical_cast.hpp>
 
 namespace kamokan {
 	class SubmitPasteResponseWithFakeStorage : public SubmitPasteResponse {
@@ -143,7 +143,7 @@ TEST_CASE ("Submit paste response", "[submitpaste][response]") {
 	CHECK(submitted_pastie.remote_ip == "127.0.0.1");
 #endif
 	CHECK(submitted_pastie.token == "b");
-	CHECK(submitted_pastie.expiry == boost::lexical_cast<uint32_t>(original_expiry));
+	CHECK(submitted_pastie.expiry == dhandy::int_conv<uint32_t>(original_expiry));
 
 	{
 		std::string output = oss.str();