diff --git a/.travis.yml b/.travis.yml
index 356b5edeb..e36cba9fc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -32,14 +32,14 @@ matrix:
     services:
     - docker
     before_install:
-    - docker pull iostio/iost-dev:3.0.10
+    - docker pull iostio/iost-dev:3.1.0
     - git lfs install
     before_script:
     - git lfs pull
     script:
-    - docker run -it --rm -v $(pwd):/gopath/src/github.com/iost-official/go-iost iostio/iost-dev:3.0.10 make build
-    - docker run -it --rm -v $(pwd):/gopath/src/github.com/iost-official/go-iost iostio/iost-dev:3.0.10 make lint
-    - docker run -it --rm -v $(pwd):/gopath/src/github.com/iost-official/go-iost iostio/iost-dev:3.0.10 make test
+    - docker run -it --rm -v $(pwd):/gopath/src/github.com/iost-official/go-iost iostio/iost-dev:3.1.0 make build
+    - docker run -it --rm -v $(pwd):/gopath/src/github.com/iost-official/go-iost iostio/iost-dev:3.1.0 make lint
+    - docker run -it --rm -v $(pwd):/gopath/src/github.com/iost-official/go-iost iostio/iost-dev:3.1.0 make test
     after_success:
     - bash <(curl -s https://codecov.io/bash)
   - os: linux
@@ -49,7 +49,7 @@ matrix:
     services:
     - docker
     before_install:
-    - docker pull iostio/iost-dev:3.0.7
+    - docker pull iostio/iost-dev:3.1.0
     - git lfs install
     before_script:
     - git lfs pull
@@ -63,7 +63,7 @@ matrix:
     services:
     - docker
     before_install:
-    - docker pull iostio/iost-dev:3.0.7
+    - docker pull iostio/iost-dev:3.1.0
     - git lfs install
     - pyenv global 3.6 && pip install awscli
     - go get -u -v github.com/kubernetes-sigs/aws-iam-authenticator/cmd/aws-iam-authenticator
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 15ca3cb06..dc8a0da06 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,18 @@
+## v3.1.0
+
+Mon May  6 11:46:27 CST 2019
+
+- Reorganized code module.
+- Add hard fork framework and a hard-fork upgrade:
+  - AmountLimit in a transaction cannot contain the same token
+  - Optimize the logic of RequireAuth function
+  - Fix mapDel bug
+- Improve synchronization performance.
+- Fix blockcache memory leak and data race.
+- Add more detailed logs.
+- Fix bug for Fixed library.
+- Optimized transaction verification processing.
+
 ## v3.0.10
 
 Mon Apr 22 14:47:14 CST 2019
diff --git a/Makefile b/Makefile
index c909db7f1..fa5661d69 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 GO = go
 
-VERSION = 3.0.10
+VERSION = 3.1.0
 COMMIT = $(shell git rev-parse --short HEAD)
 PROJECT = github.com/iost-official/go-iost
 DOCKER_IMAGE = iostio/iost-node:$(VERSION)-$(COMMIT)
diff --git a/build/k8s/iserver.yaml b/build/k8s/iserver.yaml
index e66e16dbf..ca1ee9c57 100644
--- a/build/k8s/iserver.yaml
+++ b/build/k8s/iserver.yaml
@@ -32,7 +32,7 @@ spec:
     spec:
       containers:
         - name: iserver
-          image: "iostio/iost-node:3.0.10-$COMMIT"
+          image: "iostio/iost-node:3.1.0-$COMMIT"
           imagePullPolicy: "IfNotPresent"
           command:
             - /bin/bash
diff --git a/build/k8s/itest.yaml b/build/k8s/itest.yaml
index 9645046b6..8cc539e3c 100644
--- a/build/k8s/itest.yaml
+++ b/build/k8s/itest.yaml
@@ -7,7 +7,7 @@ metadata:
 spec:
   containers:
   - name: itest
-    image: "iostio/iost-node:3.0.10-$COMMIT"
+    image: "iostio/iost-node:3.1.0-$COMMIT"
     imagePullPolicy: "IfNotPresent"
     command: ['/bin/bash', '-c', 'sleep infinity']
     resources: