diff --git a/acorn/CHANGELOG.md b/acorn/CHANGELOG.md
index f2cd6a4b6..6b71c9899 100644
--- a/acorn/CHANGELOG.md
+++ b/acorn/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 6.3.0 (2019-08-12)
+
+### New features
+
+`sourceType: "module"` can now be used even when `ecmaVersion` is less than 6, to parse module-style code that otherwise conforms to an older standard.
+
 ## 6.2.1 (2019-07-21)
 
 ### Bug fixes
diff --git a/acorn/package.json b/acorn/package.json
index c6f812313..480ea2d25 100644
--- a/acorn/package.json
+++ b/acorn/package.json
@@ -4,7 +4,7 @@
   "homepage": "https://github.com/acornjs/acorn",
   "main": "dist/acorn.js",
   "module": "dist/acorn.mjs",
-  "version": "6.2.1",
+  "version": "6.3.0",
   "engines": {"node": ">=0.4.0"},
   "maintainers": [
     {
diff --git a/acorn/src/index.js b/acorn/src/index.js
index 1fb6877ff..64ca2752e 100644
--- a/acorn/src/index.js
+++ b/acorn/src/index.js
@@ -32,7 +32,7 @@ export {isIdentifierChar, isIdentifierStart} from "./identifier"
 export {Token} from "./tokenize"
 export {isNewLine, lineBreak, lineBreakG, nonASCIIwhitespace} from "./whitespace"
 
-export const version = "6.2.1"
+export const version = "6.3.0"
 
 // The main exported interface (under `self.acorn` when in the
 // browser) is a `parse` function that takes a code string and