diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4f6bd24..c735859 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,7 +31,8 @@ ENDIF()
 # Find the required thread package on the platform
 SET(THREADS_PREFER_PTHREAD_FLAG ON)
 FIND_PACKAGE(Threads REQUIRED)
-
+FIND_PACKAGE(Boost REQUIRED)
+include_directories(${Boost_INCLUDE_DIRS})
 # Formatting utility search path
 set(TURTLE_SERVER_BUILD_SUPPORT_DIR "${CMAKE_SOURCE_DIR}/build_support")
 set(TURTLE_SERVER_CLANG_SEARCH_PATH "/usr/local/bin" "/usr/bin" "/usr/local/opt/llvm/bin" "/usr/local/opt/llvm@8/bin" "/usr/local/Cellar/llvm/8.0.1/bin")
diff --git a/src/include/core/connection.h b/src/include/core/connection.h
index 362c9bc..7460f72 100644
--- a/src/include/core/connection.h
+++ b/src/include/core/connection.h
@@ -17,7 +17,6 @@
 #include <string>
 #include <utility>
 #include <vector>
-
 #include "core/buffer.h"
 #include "core/socket.h"
 #include "core/utils.h"
diff --git a/src/include/core/looper.h b/src/include/core/looper.h
index 467d234..206fdf6 100644
--- a/src/include/core/looper.h
+++ b/src/include/core/looper.h
@@ -16,6 +16,7 @@
 #include <functional>
 #include <future> // NOLINT
 #include <map>
+#include <boost/unordered/unordered_flat_map.hpp>
 #include <memory>
 #include <mutex> // NOLINT
 
@@ -59,7 +60,7 @@ class Looper {
  private:
   std::unique_ptr<Poller> poller_;
   std::mutex mtx_;
-  std::map<int, std::unique_ptr<Connection>> connections_;
+  boost::unordered_flat_map<int, std::unique_ptr<Connection>> connections_;
   bool exit_{false};
 };
 }  // namespace TURTLE_SERVER