diff --git a/packages/core/CHANGELOG.md b/packages/core/CHANGELOG.md
index f8376151c..2d3745e80 100644
--- a/packages/core/CHANGELOG.md
+++ b/packages/core/CHANGELOG.md
@@ -1,6 +1,6 @@
 # Changelog
 
-## 1.0.2 (unreleased)
+## Unreleased
 
 - Fix false positive variable initialization check in Solidity 0.7.1. ([#171](https://github.com/OpenZeppelin/openzeppelin-upgrades/pull/171))
 
diff --git a/packages/core/package.json b/packages/core/package.json
index 9774ab578..9530c4719 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -16,7 +16,8 @@
     "prepare": "tsc -b && yarn prepare:contracts",
     "prepare:contracts": "buidler compile",
     "test": "tsc -b && buidler compile --force && ava",
-    "test:watch": "buidler compile --force && fgbg 'ava --watch' 'tsc -b --watch'"
+    "test:watch": "buidler compile --force && fgbg 'ava --watch' 'tsc -b --watch'",
+    "version": "node ../../scripts/bump-changelog.js"
   },
   "devDependencies": {
     "@nomiclabs/buidler": "^1.3.6",
diff --git a/packages/plugin-buidler/package.json b/packages/plugin-buidler/package.json
index 5c51bd663..59d1277fb 100644
--- a/packages/plugin-buidler/package.json
+++ b/packages/plugin-buidler/package.json
@@ -12,7 +12,8 @@
     "prepublish": "rimraf dist *.tsbuildinfo",
     "prepare": "tsc -b",
     "test": "tsc -b && ava",
-    "test:watch": "fgbg 'ava --watch' 'tsc -b --watch'"
+    "test:watch": "fgbg 'ava --watch' 'tsc -b --watch'",
+    "version": "node ../../scripts/bump-changelog.js"
   },
   "devDependencies": {
     "@nomiclabs/buidler": "^1.3.7",
diff --git a/packages/plugin-truffle/package.json b/packages/plugin-truffle/package.json
index fc1500312..c39074d05 100644
--- a/packages/plugin-truffle/package.json
+++ b/packages/plugin-truffle/package.json
@@ -11,7 +11,8 @@
   "scripts": {
     "prepublish": "rimraf dist *.tsbuildinfo",
     "prepare": "tsc -b",
-    "test": "tsc -b && bash test.sh"
+    "test": "tsc -b && bash test.sh",
+    "version": "node ../../scripts/bump-changelog.js"
   },
   "devDependencies": {
     "bn.js": "^5.1.2",
diff --git a/scripts/bump-changelog.js b/scripts/bump-changelog.js
new file mode 100644
index 000000000..fb756d7a2
--- /dev/null
+++ b/scripts/bump-changelog.js
@@ -0,0 +1,19 @@
+#!/usr/bin/env node
+
+const { version } = require(process.cwd() + '/package.json');
+const [date] = new Date().toISOString().split('T');
+
+const fs = require('fs');
+const changelog = fs.readFileSync('CHANGELOG.md', 'utf8');
+
+const unreleased = /^## Unreleased$/im;
+
+if (!unreleased.test(changelog)) {
+  console.error('Missing changelog entry');
+  process.exit(1);
+}
+
+fs.writeFileSync('CHANGELOG.md', changelog.replace(unreleased, `## ${version} (${date})`));
+
+const proc = require('child_process');
+proc.execSync('git add CHANGELOG.md', { stdio: 'inherit' });