diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5da9fad..352d94f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- Sync Gemfile.lock with `rqrcode_core.1.1.0`
+- Add badge for Standard linting
+
 ### Changed
 
 - Corrected method name referred to in CHANGELOG.
diff --git a/Gemfile.lock b/Gemfile.lock
index 5dbf44d..76e2fd1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -18,7 +18,7 @@ GEM
     rake (13.0.3)
     regexp_parser (2.1.1)
     rexml (3.2.5)
-    rqrcode_core (1.0.0)
+    rqrcode_core (1.1.0)
     rspec (3.10.0)
       rspec-core (~> 3.10.0)
       rspec-expectations (~> 3.10.0)
diff --git a/README.md b/README.md
index 5f6fdd8..170e2f6 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # RQRCode
 
 ![](https://github.com/whomwah/rqrcode/actions/workflows/ruby.yml/badge.svg)
+[![Ruby Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://github.com/testdouble/standard)
 
 
 [RQRCode](https://github.com/whomwah/rqrcode) is a library for creating and rendering QR codes into various formats. It has a simple interface with all the standard QR code options. It was adapted from the Javascript library by Kazuhiko Arase.