diff --git a/contracts/package.json b/contracts/package.json
index 841cbe311..e82ab0881 100644
--- a/contracts/package.json
+++ b/contracts/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@openzeppelin/contracts",
-  "version": "3.0.2",
+  "version": "3.1.0-rc.0",
   "description": "Secure Smart Contract library for Solidity",
   "files": [
     "**/*.sol",
diff --git a/package-lock.json b/package-lock.json
index dd5e1d9f4..f825f99dd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "openzeppelin-solidity",
-  "version": "3.0.2",
+  "version": "3.1.0-rc.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index e4f8146a5..a1260889f 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "openzeppelin-solidity",
-  "version": "3.0.2",
+  "version": "3.1.0-rc.0",
   "description": "Secure Smart Contract library for Solidity",
   "files": [
     "/contracts/**/*.sol",