diff --git a/CHANGES.md b/CHANGES.md
index 79f6d9b9..42e377bc 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -17,8 +17,10 @@
   - @voluntas
 - [UPDATE] CMake を 3.30.5 にあげる
   - @voluntas
-- [UPDATE] Boost を 1.86.0 にあげる
-  - @voluntas
+- [UPDATE] Boost を 1.87.0 にあげる
+  - boost::asio::deadline_timer が間接的にインクルードされなくなったので、websocket.h に boost/asio/deadline_timer.hpp のインクルードを追加して利用可能にする
+  - boost::json::error_code が削除されたので boost::system::error_code に置き換える
+  - @voluntas @torikizi @melpon
 - [UPDATE] libwebrtc を m131.6778.4.0 にあげる
   - H.265 Patch の修正に伴い、C++ SDK の H.265 に関する設定を変更
   - examples と test に `rtc::CreateRandomString` のヘッダを追加
diff --git a/VERSION b/VERSION
index 2ca969c1..800c3669 100644
--- a/VERSION
+++ b/VERSION
@@ -1,6 +1,6 @@
 SORA_CPP_SDK_VERSION=2024.8.0-canary.31
 WEBRTC_BUILD_VERSION=m131.6778.4.0
-BOOST_VERSION=1.86.0
+BOOST_VERSION=1.87.0
 CMAKE_VERSION=3.30.5
 CUDA_VERSION=11.8.0-1
 ANDROID_NDK_VERSION=r26b
diff --git a/examples/VERSION b/examples/VERSION
index a9fd6d1c..5987dbdb 100644
--- a/examples/VERSION
+++ b/examples/VERSION
@@ -1,6 +1,6 @@
 SORA_CPP_SDK_VERSION=2024.8.0-canary.31
 WEBRTC_BUILD_VERSION=m131.6778.4.0
-BOOST_VERSION=1.86.0
+BOOST_VERSION=1.87.0
 CMAKE_VERSION=3.30.5
 SDL2_VERSION=2.30.10
 CLI11_VERSION=v2.4.2
diff --git a/examples/messaging_recvonly_sample/src/messaging_recvonly_sample.cpp b/examples/messaging_recvonly_sample/src/messaging_recvonly_sample.cpp
index 8cbbaee5..259b7ce9 100644
--- a/examples/messaging_recvonly_sample/src/messaging_recvonly_sample.cpp
+++ b/examples/messaging_recvonly_sample/src/messaging_recvonly_sample.cpp
@@ -140,7 +140,7 @@ int main(int argc, char* argv[]) {
 
   auto is_json = CLI::Validator(
       [](std::string input) -> std::string {
-        boost::json::error_code ec;
+        boost::system::error_code ec;
         boost::json::parse(input);
         if (ec) {
           return "Value " + input + " is not JSON Value";
diff --git a/examples/sdl_sample/src/sdl_sample.cpp b/examples/sdl_sample/src/sdl_sample.cpp
index 02f34a29..4b647adb 100644
--- a/examples/sdl_sample/src/sdl_sample.cpp
+++ b/examples/sdl_sample/src/sdl_sample.cpp
@@ -184,7 +184,7 @@ int main(int argc, char* argv[]) {
 
   auto is_json = CLI::Validator(
       [](std::string input) -> std::string {
-        boost::json::error_code ec;
+        boost::system::error_code ec;
         boost::json::parse(input, ec);
         if (ec) {
           return "Value " + input + " is not JSON Value";
diff --git a/examples/sumomo/src/sumomo.cpp b/examples/sumomo/src/sumomo.cpp
index 603fcad0..213e3b56 100644
--- a/examples/sumomo/src/sumomo.cpp
+++ b/examples/sumomo/src/sumomo.cpp
@@ -347,7 +347,7 @@ int main(int argc, char* argv[]) {
 
   auto is_json = CLI::Validator(
       [](std::string input) -> std::string {
-        boost::json::error_code ec;
+        boost::system::error_code ec;
         boost::json::parse(input, ec);
         if (ec) {
           return "Value " + input + " is not JSON Value";
diff --git a/include/sora/websocket.h b/include/sora/websocket.h
index 759e5851..9a3ef056 100644
--- a/include/sora/websocket.h
+++ b/include/sora/websocket.h
@@ -6,6 +6,7 @@
 #include <optional>
 
 // Boost
+#include <boost/asio/deadline_timer.hpp>
 #include <boost/asio/io_context.hpp>
 #include <boost/asio/ip/tcp.hpp>
 #include <boost/asio/ssl/context.hpp>