diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4b41c33b54..dd314aed42 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@ include(cmake/Utils.cmake)
 include(cmake/Env.cmake)
 
 project("OceanBase CE"
-  VERSION 3.1.0
+  VERSION 3.1.1
   DESCRIPTION "OceanBase distributed database system"
   HOMEPAGE_URL "https://www.oceanbase.com/"
   LANGUAGES CXX C ASM)
diff --git a/src/share/ob_cluster_version.h b/src/share/ob_cluster_version.h
index cbb95d8904..cbfa65a990 100644
--- a/src/share/ob_cluster_version.h
+++ b/src/share/ob_cluster_version.h
@@ -92,11 +92,12 @@ uint64_t cal_version(const uint64_t major, const uint64_t minor, const uint64_t
 #define CLUSTER_VERSION_2277 (oceanbase::common::cal_version(2, 2, 77))
 #define CLUSTER_VERSION_3000 (oceanbase::common::cal_version(3, 0, 0))
 #define CLUSTER_VERSION_3100 (oceanbase::common::cal_version(3, 1, 0))
+#define CLUSTER_VERSION_311 (oceanbase::common::cal_version(3, 1, 1))
 #define CLUSTER_VERSION_MAX UINT64_MAX
 // FIXME If you update the above version, please update me, CLUSTER_CURRENT_VERSION & ObUpgradeChecker!!!!!!
 
 //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
-#define CLUSTER_CURRENT_VERSION CLUSTER_VERSION_3100
+#define CLUSTER_CURRENT_VERSION CLUSTER_VERSION_311
 #define GET_MIN_CLUSTER_VERSION() (oceanbase::common::ObClusterVersion::get_instance().get_cluster_version())
 #define GET_UNIS_CLUSTER_VERSION() (::oceanbase::lib::get_unis_compat_version() ?: GET_MIN_CLUSTER_VERSION())
 
@@ -110,6 +111,8 @@ uint64_t cal_version(const uint64_t major, const uint64_t minor, const uint64_t
   (oceanbase::common::ObClusterVersion::get_instance().get_cluster_version() < CLUSTER_VERSION_3000)
 #define IS_CLUSTER_VERSION_BEFORE_3100 \
   (oceanbase::common::ObClusterVersion::get_instance().get_cluster_version() < CLUSTER_VERSION_3100)
+#define IS_CLUSTER_VERSION_BEFORE_311 \
+  (oceanbase::common::ObClusterVersion::get_instance().get_cluster_version() < CLUSTER_VERSION_311)
 
 #define IS_CLUSTER_VERSION_AFTER_2274 \
   (oceanbase::common::ObClusterVersion::get_instance().get_cluster_version() > CLUSTER_VERSION_2274)
diff --git a/src/share/ob_upgrade_utils.cpp b/src/share/ob_upgrade_utils.cpp
index ef168deadb..4e9554931b 100644
--- a/src/share/ob_upgrade_utils.cpp
+++ b/src/share/ob_upgrade_utils.cpp
@@ -61,7 +61,8 @@ const uint64_t ObUpgradeChecker::UPGRADE_PATH[CLUTER_VERSION_NUM] = {
     CALC_CLUSTER_VERSION(2UL, 2UL, 74UL),  // 2.2.74
     CALC_CLUSTER_VERSION(2UL, 2UL, 75UL),  // 2.2.75
     CALC_CLUSTER_VERSION(2UL, 2UL, 76UL),  // 2.2.76
-    CALC_CLUSTER_VERSION(3UL, 1UL, 0UL)    // 3.1.0
+    CALC_CLUSTER_VERSION(3UL, 1UL, 0UL),    // 3.1.0
+    CALC_CLUSTER_VERSION(3UL, 1UL, 1UL)    //3.1.1
 };
 
 bool ObUpgradeChecker::check_cluster_version_exist(const uint64_t version)
@@ -1125,6 +1126,7 @@ int ObUpgradeProcesserSet::init(ObBaseUpgradeProcessor::UpgradeMode mode, common
     INIT_PROCESSOR_BY_VERSION(2, 2, 75);
     INIT_PROCESSOR_BY_VERSION(2, 2, 76);
     INIT_PROCESSOR_BY_VERSION(3, 1, 0);
+    INIT_PROCESSOR_BY_VERSION(3, 1, 1);
 #undef INIT_PROCESSOR_BY_VERSION
     inited_ = true;
   }
diff --git a/src/share/ob_upgrade_utils.h b/src/share/ob_upgrade_utils.h
index 45da0dd0e8..975b9c174b 100644
--- a/src/share/ob_upgrade_utils.h
+++ b/src/share/ob_upgrade_utils.h
@@ -181,7 +181,7 @@ public:
   static bool check_cluster_version_exist(const uint64_t version);
 
 public:
-  static const int64_t CLUTER_VERSION_NUM = 32;
+  static const int64_t CLUTER_VERSION_NUM = 33;
   static const uint64_t UPGRADE_PATH[CLUTER_VERSION_NUM];
 };
 
@@ -230,6 +230,7 @@ public:
 DEF_SIMPLE_UPGRARD_PROCESSER(2, 2, 76);
 // 3.1.0
 DEF_SIMPLE_UPGRARD_PROCESSER(3, 1, 0);
+DEF_SIMPLE_UPGRARD_PROCESSER(3, 1, 1);
 
 /* =========== upgrade processor end ============= */
 
diff --git a/src/share/parameter/ob_parameter_seed.ipp b/src/share/parameter/ob_parameter_seed.ipp
index 602f3b8f0d..f3a51ce03a 100644
--- a/src/share/parameter/ob_parameter_seed.ipp
+++ b/src/share/parameter/ob_parameter_seed.ipp
@@ -515,7 +515,7 @@ DEF_TIME(get_leader_candidate_rpc_timeout, OB_CLUSTER_PARAMETER, "9s", "[2s, 180
     "the time during a get leader candidate rpc request "
     "is permitted to execute before it is terminated. Range: [2s, 180s]",
     ObParameterAttr(Section::ROOT_SERVICE, Source::DEFAULT, EditLevel::DYNAMIC_EFFECTIVE));
-DEF_STR(min_observer_version, OB_CLUSTER_PARAMETER, "3.1.0", "the min observer version",
+DEF_STR(min_observer_version, OB_CLUSTER_PARAMETER, "3.1.1", "the min observer version",
     ObParameterAttr(Section::ROOT_SERVICE, Source::DEFAULT, EditLevel::DYNAMIC_EFFECTIVE));
 DEF_BOOL(enable_ddl, OB_CLUSTER_PARAMETER, "True",
     "specifies whether DDL operation is turned on. "