diff --git a/src/rime/config/config_types.cc b/src/rime/config/config_types.cc
index 47429f0b3..25e299621 100644
--- a/src/rime/config/config_types.cc
+++ b/src/rime/config/config_types.cc
@@ -6,7 +6,6 @@
 //
 #include <cstdlib>
 #include <boost/algorithm/string.hpp>
-#include <boost/lexical_cast.hpp>
 #include <rime/config/config_data.h>
 #include <rime/config/config_types.h>
 
@@ -61,7 +60,7 @@ bool ConfigValue::GetInt(int* value) const {
   }
   // decimal
   try {
-    *value = boost::lexical_cast<int>(value_);
+    *value = std::stoi(value_);
   } catch (...) {
     return false;
   }
@@ -72,7 +71,7 @@ bool ConfigValue::GetDouble(double* value) const {
   if (!value || value_.empty())
     return false;
   try {
-    *value = boost::lexical_cast<double>(value_);
+    *value = std::stod(value_);
   } catch (...) {
     return false;
   }
@@ -92,12 +91,12 @@ bool ConfigValue::SetBool(bool value) {
 }
 
 bool ConfigValue::SetInt(int value) {
-  value_ = boost::lexical_cast<string>(value);
+  value_ = std::to_string(value);
   return true;
 }
 
 bool ConfigValue::SetDouble(double value) {
-  value_ = boost::lexical_cast<string>(value);
+  value_ = std::to_string(value);
   return true;
 }
 
diff --git a/src/rime/dict/entry_collector.cc b/src/rime/dict/entry_collector.cc
index 738133132..a91c60d38 100644
--- a/src/rime/dict/entry_collector.cc
+++ b/src/rime/dict/entry_collector.cc
@@ -8,7 +8,6 @@
 #include <fstream>
 #include <utility>
 #include <boost/algorithm/string.hpp>
-#include <boost/lexical_cast.hpp>
 #include <rime/algo/strings.h>
 #include <rime/dict/dict_settings.h>
 #include <rime/dict/entry_collector.h>
diff --git a/src/rime/dict/preset_vocabulary.cc b/src/rime/dict/preset_vocabulary.cc
index 218a98bed..4596621a1 100644
--- a/src/rime/dict/preset_vocabulary.cc
+++ b/src/rime/dict/preset_vocabulary.cc
@@ -5,7 +5,6 @@
 // 2011-11-27 GONG Chen <chen.sst@gmail.com>
 //
 #include <filesystem>
-#include <boost/lexical_cast.hpp>
 #include <utf8.h>
 #include <rime/resource.h>
 #include <rime/service.h>
@@ -74,7 +73,7 @@ bool PresetVocabulary::GetWeightForEntry(const string& key, double* weight) {
   if (!db_ || !db_->Fetch(key, &weight_str))
     return false;
   try {
-    *weight = boost::lexical_cast<double>(weight_str);
+    *weight = std::stod(weight_str);
   } catch (...) {
     return false;
   }
@@ -105,7 +104,7 @@ bool PresetVocabulary::IsQualifiedPhrase(const string& phrase,
       return false;
   }
   if (min_phrase_weight_ > 0.0) {
-    double weight = boost::lexical_cast<double>(weight_str);
+    double weight = std::stod(weight_str);
     if (weight < min_phrase_weight_)
       return false;
   }
diff --git a/src/rime/dict/reverse_lookup_dictionary.cc b/src/rime/dict/reverse_lookup_dictionary.cc
index 117e81e76..b9d1042c6 100644
--- a/src/rime/dict/reverse_lookup_dictionary.cc
+++ b/src/rime/dict/reverse_lookup_dictionary.cc
@@ -10,7 +10,6 @@
 #include <sstream>
 #include <boost/algorithm/string.hpp>
 #include <filesystem>
-#include <boost/lexical_cast.hpp>
 #include <rime/resource.h>
 #include <rime/schema.h>
 #include <rime/service.h>
diff --git a/src/rime/dict/table_db.cc b/src/rime/dict/table_db.cc
index 0b92ba2e5..59bc2cd39 100644
--- a/src/rime/dict/table_db.cc
+++ b/src/rime/dict/table_db.cc
@@ -5,7 +5,6 @@
 // 2013-04-18 GONG Chen <chen.sst@gmail.com>
 //
 #include <boost/algorithm/string.hpp>
-#include <boost/lexical_cast.hpp>
 #include <rime/dict/table_db.h>
 #include <rime/dict/user_db.h>
 
@@ -28,7 +27,7 @@ static bool rime_table_entry_parser(const Tsv& row,
   UserDbValue v;
   if (row.size() >= 3 && !row[2].empty()) {
     try {
-      v.commits = boost::lexical_cast<int>(row[2]);
+      v.commits = std::stoi(row[2]);
       const double kS = 1e8;
       v.dee = (v.commits + 1) / kS;
     } catch (...) {
@@ -51,7 +50,7 @@ static bool rime_table_entry_formatter(const string& key,
     return false;
   boost::algorithm::trim(row[0]);  // remove trailing space
   row[0].swap(row[1]);
-  row.push_back(boost::lexical_cast<string>(v.commits));
+  row.push_back(std::to_string(v.commits));
   return true;
 }
 
diff --git a/src/rime/dict/user_db.cc b/src/rime/dict/user_db.cc
index 21d32b98a..3aca42100 100644
--- a/src/rime/dict/user_db.cc
+++ b/src/rime/dict/user_db.cc
@@ -7,7 +7,6 @@
 #include <cstdlib>
 #include <boost/algorithm/string.hpp>
 #include <boost/format.hpp>
-#include <boost/lexical_cast.hpp>
 #include <rime/service.h>
 #include <rime/algo/dynamics.h>
 #include <rime/dict/text_db.h>
@@ -34,11 +33,11 @@ bool UserDbValue::Unpack(const string& value) {
     string v(k_eq_v.substr(eq + 1));
     try {
       if (k == "c") {
-        commits = boost::lexical_cast<int>(v);
+        commits = std::stoi(v);
       } else if (k == "d") {
-        dee = (std::min)(10000.0, boost::lexical_cast<double>(v));
+        dee = (std::min)(10000.0, std::stod(v));
       } else if (k == "t") {
-        tick = boost::lexical_cast<TickCount>(v);
+        tick = std::stoul(v);
       }
     } catch (...) {
       LOG(ERROR) << "failed in parsing key-value from userdb entry '" << k_eq_v
@@ -170,7 +169,7 @@ static TickCount get_tick_count(Db* db) {
   string tick;
   if (db && db->MetaFetch("/tick", &tick)) {
     try {
-      return boost::lexical_cast<TickCount>(tick);
+      return std::stoul(tick);
     } catch (...) {
     }
   }
@@ -190,7 +189,7 @@ UserDbMerger::~UserDbMerger() {
 bool UserDbMerger::MetaPut(const string& key, const string& value) {
   if (key == "/tick") {
     try {
-      their_tick_ = boost::lexical_cast<TickCount>(value);
+      their_tick_ = std::stoul(value);
       max_tick_ = (std::max)(our_tick_, their_tick_);
     } catch (...) {
     }
@@ -225,7 +224,7 @@ void UserDbMerger::CloseMerge() {
     return;
   Deployer& deployer(Service::instance().deployer());
   try {
-    db_->MetaUpdate("/tick", boost::lexical_cast<string>(max_tick_));
+    db_->MetaUpdate("/tick", std::to_string(max_tick_));
     db_->MetaUpdate("/user_id", deployer.user_id);
   } catch (...) {
     LOG(ERROR) << "failed to update tick count.";
diff --git a/src/rime/dict/user_dictionary.cc b/src/rime/dict/user_dictionary.cc
index 48751a5e7..73630610f 100644
--- a/src/rime/dict/user_dictionary.cc
+++ b/src/rime/dict/user_dictionary.cc
@@ -8,7 +8,6 @@
 #include <cfloat>
 #include <cmath>
 #include <boost/algorithm/string.hpp>
-#include <boost/lexical_cast.hpp>
 #include <boost/scope_exit.hpp>
 #include <rime/common.h>
 #include <rime/language.h>
@@ -381,7 +380,7 @@ bool UserDictionary::UpdateEntry(const DictEntry& entry,
 bool UserDictionary::UpdateTickCount(TickCount increment) {
   tick_ += increment;
   try {
-    return db_->MetaUpdate("/tick", boost::lexical_cast<string>(tick_));
+    return db_->MetaUpdate("/tick", std::to_string(tick_));
   } catch (...) {
     return false;
   }
@@ -397,7 +396,7 @@ bool UserDictionary::FetchTickCount() {
     // an earlier version mistakenly wrote tick count into an empty key
     if (!db_->MetaFetch("/tick", &value) && !db_->Fetch("", &value))
       return false;
-    tick_ = boost::lexical_cast<TickCount>(value);
+    tick_ = std::stoul(value);
     return true;
   } catch (...) {
     // tick_ = 0;
diff --git a/src/rime/gear/key_binder.cc b/src/rime/gear/key_binder.cc
index 32631e3a9..818e85cde 100644
--- a/src/rime/gear/key_binder.cc
+++ b/src/rime/gear/key_binder.cc
@@ -5,7 +5,6 @@
 // 2011-11-23 GONG Chen <chen.sst@gmail.com>
 //
 #include <algorithm>
-#include <boost/lexical_cast.hpp>
 #include <rime/common.h>
 #include <rime/composition.h>
 #include <rime/context.h>
@@ -79,7 +78,7 @@ inline static bool is_switch_index(const string& option) {
 static Switches::SwitchOption switch_by_index(Switches& switches,
                                               const string& option) {
   try {
-    size_t index = boost::lexical_cast<size_t>(option.substr(1));
+    size_t index = std::stoul(option.substr(1));
     return switches.ByIndex(index);
   } catch (...) {
   }
diff --git a/src/rime/lever/customizer.cc b/src/rime/lever/customizer.cc
index ab10db46a..32bd8a298 100644
--- a/src/rime/lever/customizer.cc
+++ b/src/rime/lever/customizer.cc
@@ -5,7 +5,6 @@
 // 2011-12-12 GONG Chen <chen.sst@gmail.com>
 //
 #include <stdint.h>
-#include <boost/lexical_cast.hpp>
 #include <rime/common.h>
 #include <rime/config.h>
 #include <rime/algo/utilities.h>
@@ -73,7 +72,7 @@ bool Customizer::UpdateConfigFile() {
   }
   string customization;
   if (!custom_path.empty() && fs::exists(custom_path)) {
-    customization = boost::lexical_cast<string>(Checksum(custom_path.string()));
+    customization = std::to_string(Checksum(custom_path.string()));
   }
   if (applied_customization != customization) {
     need_update = true;