diff --git a/CHANGES.md b/CHANGES.md
index e6e1f1f4a9..0b0a0ba6cd 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,4 +1,4 @@
-## Version 10.4.0 (a work in process)
+## Version 10.4.0-beta1
 
 Parser:
 
@@ -22,6 +22,11 @@ New Languages:
 
 Language Improvements:
 
+- enh(autodetect) Over 30+ improvements to auto-detect (#2745) [Josh Goebel][]
+    - 4-5% improvement in auto-detect against large sample set
+    - properties, angelscript, lsl, javascript, n1ql, ocaml, ruby
+    - protobuf, hy, scheme, crystal, yaml, r, vbscript, groovy
+    - python, java, php, lisp, matlab, clojure, csharp, css
 - fix(r) fixed keywords not properly spaced (#2852) [Josh Goebel][]
 - fix(javascript) fix potential catastrophic backtracking (#2852) [Josh Goebel][]
 - fix(livescript) fix potential catastrophic backtracking (#2852) [Josh Goebel][]
@@ -61,6 +66,7 @@ New themes:
 - *StackOverflow Dark* by [Jan Pilzer][]
 - *StackOverflow Light* by [Jan Pilzer][]
 
+[Brad Chamberlain]: https://github.com/bradcray
 [Marat Nagayev]: https://github.com/nagayev
 [Fredrik Ekre]: https://github.com/fredrikekre
 [Richard Gibson]: https://github.com/gibson042
diff --git a/docs/conf.py b/docs/conf.py
index 60dd5aa513..1094886b3f 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -48,7 +48,7 @@
 # built documents.
 
 # The full version, including alpha/beta/rc tags.
-release = '10.3.1'
+release = '10.4.0-beta1'
 # The short X.Y version.
 version = ".".join(release.split(".")[:2])
 
diff --git a/package-lock.json b/package-lock.json
index caf12c145f..e95bef2389 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "highlight.js",
-  "version": "10.3.99",
+  "version": "10.4.0-beta1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 5241075128..311b83c7b2 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
     "syntax"
   ],
   "homepage": "https://highlightjs.org/",
-  "version": "10.3.99",
+  "version": "10.4.0-beta1",
   "author": {
     "name": "Ivan Sagalaev",
     "email": "maniac@softwaremaniacs.org"