diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2a2a6eb..a4a6118 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.10)
+cmake_minimum_required(VERSION 3.05)
 
 project(CocoaTweet CXX C)
 
@@ -60,7 +60,8 @@ if(ENABLE_TEST)
   if(NOT (UNIX OR APPLE))
     message(FAITAL_ERROR "unit test is NOT supported on Windows")
   endif()
-  find_package(Boost 1.71.0 COMPONENTS unit_test_framework REQUIRED)
+  set(Boost_NO_BOOST_CMAKE TRUE)
+  find_package(Boost 1.67 COMPONENTS unit_test_framework REQUIRED)
   # Enable CTest
   enable_testing()
   add_subdirectory(test)
diff --git a/README.md b/README.md
index 7106e74..41f443d 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ you can use these endpoint
 # Installation
 ## Ubuntu
 ```
-# apt install clang cmake git libboost-dev libboost-test-dev libcurl4-openssl-dev libssl-dev nunja-build
+# apt install clang cmake git libboost-dev libboost-test-dev libcurl4-openssl-dev libssl-dev ninja-build
 $ git clone https://github.com/koron0902/CocoaTweet
 $ cd CocoaTweet
 $ mkdir build
diff --git a/Testing/Temporary/CTestCostData.txt b/Testing/Temporary/CTestCostData.txt
new file mode 100644
index 0000000..ed97d53
--- /dev/null
+++ b/Testing/Temporary/CTestCostData.txt
@@ -0,0 +1 @@
+---
diff --git a/Testing/Temporary/LastTest.log b/Testing/Temporary/LastTest.log
new file mode 100644
index 0000000..873b00a
--- /dev/null
+++ b/Testing/Temporary/LastTest.log
@@ -0,0 +1,3 @@
+Start testing: Oct 07 22:14 JST
+----------------------------------------------------------
+End testing: Oct 07 22:14 JST
diff --git a/src/cocoatweet/api/model/tweet.cc b/src/cocoatweet/api/model/tweet.cc
index 26988ac..22f971e 100644
--- a/src/cocoatweet/api/model/tweet.cc
+++ b/src/cocoatweet/api/model/tweet.cc
@@ -10,8 +10,10 @@ Tweet Tweet::parse(const std::string& _json) {
   tweet.createdAt(j["created_at"]);
   tweet.text(j["text"]);
   tweet.source(j["source"]);
+  if(j.contains("user")){
+    tweet.user(CocoaTweet::API::Model::User(j["user"].dump()));
+  }
 
-  tweet.user(CocoaTweet::API::Model::User(j["user"].dump()));
 
   return tweet;
 }