diff --git a/docs/package-lock.json b/docs/package-lock.json
index 14ec382..7bfe541 100644
--- a/docs/package-lock.json
+++ b/docs/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "material-ui-flat-pagination-demo",
-  "version": "3.1.0-SNAPSHOT",
+  "version": "3.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/docs/package.json b/docs/package.json
index 90df90c..0b3ec56 100644
--- a/docs/package.json
+++ b/docs/package.json
@@ -1,7 +1,7 @@
 {
   "name": "material-ui-flat-pagination-demo",
   "description": "Demo of material-ui-flat-pagination.",
-  "version": "3.1.0-SNAPSHOT",
+  "version": "3.1.0",
   "author": "szmslab <szmslab@gmail.com> (https://github.com/szmslab)",
   "dependencies": {
     "@material-ui/core": "^3.3.2",
diff --git a/package-lock.json b/package-lock.json
index f466753..350131d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "material-ui-flat-pagination",
-  "version": "3.1.0-SNAPSHOT",
+  "version": "3.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 5ed9823..456c429 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "material-ui-flat-pagination",
   "description": "A pagination component for Material-UI using Button component.",
-  "version": "3.1.0-SNAPSHOT",
+  "version": "3.1.0",
   "author": "szmslab <szmslab@gmail.com> (https://github.com/szmslab)",
   "bugs": {
     "url": "https://github.com/szmslab/material-ui-flat-pagination/issues"