diff --git a/.ruby-version b/.ruby-version
index acdc3f1b..35cee72d 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.4.2
\ No newline at end of file
+2.4.3
diff --git a/Dockerfile b/Dockerfile
index b064a215..cea7e0d8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.4.2
+FROM ruby:2.4.3
 
 WORKDIR /devdocs
 
diff --git a/Dockerfile-alpine b/Dockerfile-alpine
index e226842a..59b0ed16 100644
--- a/Dockerfile-alpine
+++ b/Dockerfile-alpine
@@ -1,4 +1,4 @@
-FROM ruby:2.4.2-alpine
+FROM ruby:2.4.3-alpine
 
 WORKDIR /devdocs
 
diff --git a/Gemfile b/Gemfile
index b2305f81..2676cc3b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
-ruby '2.4.2'
+ruby '~> 2.4.3'
 
 gem 'rake'
 gem 'thor'
diff --git a/Gemfile.lock b/Gemfile.lock
index 298217cd..c9747f7d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -152,7 +152,7 @@ DEPENDENCIES
   yajl-ruby
 
 RUBY VERSION
-   ruby 2.4.2p198
+   ruby 2.4.3p205
 
 BUNDLED WITH
-   1.16.0
+   1.16.1
diff --git a/README.md b/README.md
index 03786ac5..d07cba51 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ Unless you wish to contribute to the project, I recommend using the hosted versi
 
 DevDocs is made of two pieces: a Ruby scraper that generates the documentation and metadata, and a JavaScript app powered by a small Sinatra app.
 
-DevDocs requires Ruby 2.4.2, libcurl, and a JavaScript runtime supported by [ExecJS](https://github.com/rails/execjs#readme) (included in OS X and Windows; [Node.js](https://nodejs.org/en/) on Linux). Once you have these installed, run the following commands:
+DevDocs requires Ruby 2.4.3, libcurl, and a JavaScript runtime supported by [ExecJS](https://github.com/rails/execjs#readme) (included in OS X and Windows; [Node.js](https://nodejs.org/en/) on Linux). Once you have these installed, run the following commands:
 
 ```
 git clone https://github.com/Thibaut/devdocs.git && cd devdocs