diff --git a/.ruby-version b/.ruby-version
index 0bee604d..8e8299dc 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-2.3.3
+2.4.2
diff --git a/Gemfile.lock b/Gemfile.lock
index 5cc137ce..24e93e64 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -180,4 +180,4 @@ DEPENDENCIES
   unicorn
 
 BUNDLED WITH
-   1.13.6
+   1.15.4
diff --git a/README.md b/README.md
index e1ad8670..ec40c514 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ file.
 
 #### Initial setup
 
-* Install Ruby 2.3.
+* Install the version of Ruby listed in `.ruby-verison`.
 
 * Checkout the lobsters git tree from Github