diff --git a/cmake/external/protobuf.cmake b/cmake/external/protobuf.cmake
index 76d16c254147dc6df89e40ba3241b02c41a37bbb..ec687ac708982ed9aa215849ac5eb703e8d33be6 100644
--- a/cmake/external/protobuf.cmake
+++ b/cmake/external/protobuf.cmake
@@ -184,7 +184,7 @@ FUNCTION(build_protobuf TARGET_NAME BUILD_FOR_HOST)
             ${EXTERNAL_PROJECT_LOG_ARGS}
             PREFIX          ${PROTOBUF_SOURCES_DIR}
             UPDATE_COMMAND  ""
-            URL https://github.com/google/protobuf/archive/v3.5.2.zip
+            URL https://github.com/google/protobuf/archive/v3.1.0.zip
             CONFIGURE_COMMAND
             ${CMAKE_COMMAND} ${PROTOBUF_SOURCES_DIR}/src/${TARGET_NAME}/cmake
                 ${OPTIONAL_ARGS}
@@ -210,7 +210,7 @@ FUNCTION(build_protobuf TARGET_NAME BUILD_FOR_HOST)
             PREFIX          ${PROTOBUF_SOURCES_DIR}
             UPDATE_COMMAND  ""
             DEPENDS         zlib
-            URL https://github.com/google/protobuf/archive/v3.5.2.zip
+            URL https://github.com/google/protobuf/archive/v3.1.0.zip
             CONFIGURE_COMMAND
             ${CMAKE_COMMAND} ${PROTOBUF_SOURCES_DIR}/src/${TARGET_NAME}/cmake
                 ${OPTIONAL_ARGS}
@@ -229,7 +229,7 @@ FUNCTION(build_protobuf TARGET_NAME BUILD_FOR_HOST)
     ENDIF(MSVC)
 ENDFUNCTION()
 
-SET(PROTOBUF_VERSION 3.5)
+SET(PROTOBUF_VERSION 3.1)
 IF(CMAKE_CROSSCOMPILING)
     build_protobuf(protobuf_host TRUE)
     LIST(APPEND external_project_dependencies protobuf_host)
diff --git a/requirements.txt b/requirements.txt
index cc713def45f19c69e7c6555d046891c30d0e5e12..d5b6935a8908f5910c0c83140ba2d89cd2c00849 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,4 +8,4 @@ Pillow==5.0.0
 pre-commit==1.5.1
 flask==0.12.2
 six==1.11.0
-protobuf==3.5.1
+protobuf>=3.1.0
diff --git a/setup.py b/setup.py
index 570fba1f1ee7cc558b2fb164d8a3fdd3a0c9baf5..b20ce455064bff127a39690b75868f1ff49ad444 100644
--- a/setup.py
+++ b/setup.py
@@ -43,7 +43,7 @@ VERSION_NUMBER = read('VERSION_NUMBER')
 LICENSE = readlines('LICENSE')[0].strip()
 
 # use memcache to reduce disk read frequency.
-install_requires = ['Flask', 'numpy', 'Pillow', 'protobuf', 'scipy']
+install_requires = ['Flask', 'numpy', 'Pillow', 'protobuf >= 3.1.0', 'scipy']
 execute_requires = ['npm', 'node', 'bash', 'cmake', 'unzip']
 if platform == "win32":
     execute_requires = ['node', 'powershell', 'cmake']
diff --git a/visualdl/storage/storage.cc b/visualdl/storage/storage.cc
index 8dc4acdc8eb565d8d1ec3ff95bea5925cbe6a377..cb505d583480acc2551339349adcbb184453f171 100644
--- a/visualdl/storage/storage.cc
+++ b/visualdl/storage/storage.cc
@@ -21,7 +21,7 @@ Storage::Storage() {
   data_ = std::make_shared<storage::Storage>();
   tablets_ = std::make_shared<std::map<std::string, storage::Tablet>>();
   modes_ = std::make_shared<std::set<std::string>>();
-  modified_tablet_set_ = std::unordered_set<std::string>();
+  modified_tablet_set_ = std::set<std::string>();
   time_t t;
   time(&t);
   data_->set_timestamp(t);
diff --git a/visualdl/storage/storage.h b/visualdl/storage/storage.h
index 2b4fc099ab71a2b8ff1f3786fab371c1e684a5d7..fb2ee9e31ef1fd1d5bbacc1b28d12b2018c34d9e 100644
--- a/visualdl/storage/storage.h
+++ b/visualdl/storage/storage.h
@@ -90,7 +90,7 @@ private:
   std::shared_ptr<std::map<std::string, storage::Tablet>> tablets_;
   std::shared_ptr<storage::Storage> data_;
   std::shared_ptr<std::set<std::string>> modes_;
-  std::unordered_set<std::string> modified_tablet_set_;
+  std::set<std::string> modified_tablet_set_;
 };
 
 // Storage reader, each method will trigger a reading from disk.