diff --git a/Gemfile.lock b/Gemfile.lock
index f731da3..aaffeef 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,50 +8,50 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    activemodel (5.0.0)
-      activesupport (= 5.0.0)
-    activerecord (5.0.0)
-      activemodel (= 5.0.0)
-      activesupport (= 5.0.0)
+    activemodel (5.0.0.1)
+      activesupport (= 5.0.0.1)
+    activerecord (5.0.0.1)
+      activemodel (= 5.0.0.1)
+      activesupport (= 5.0.0.1)
       arel (~> 7.0)
-    activesupport (5.0.0)
+    activesupport (5.0.0.1)
       concurrent-ruby (~> 1.0, >= 1.0.2)
       i18n (~> 0.7)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    arel (7.0.0)
-    byebug (9.0.5)
+    arel (7.1.4)
+    byebug (9.0.6)
     concurrent-ruby (1.0.2)
-    daemons (1.2.3)
+    daemons (1.2.4)
     diff-lcs (1.2.5)
     haml (4.0.7)
       tilt
     i18n (0.7.0)
-    minitest (5.9.0)
-    rack (1.6.4)
+    minitest (5.9.1)
+    rack (1.6.5)
     rack-protection (1.5.3)
       rack
     rack-test (0.6.3)
       rack (>= 1.0)
-    rake (11.2.2)
-    rspec (3.4.0)
-      rspec-core (~> 3.4.0)
-      rspec-expectations (~> 3.4.0)
-      rspec-mocks (~> 3.4.0)
-    rspec-core (3.4.4)
-      rspec-support (~> 3.4.0)
-    rspec-expectations (3.4.0)
+    rake (11.3.0)
+    rspec (3.5.0)
+      rspec-core (~> 3.5.0)
+      rspec-expectations (~> 3.5.0)
+      rspec-mocks (~> 3.5.0)
+    rspec-core (3.5.4)
+      rspec-support (~> 3.5.0)
+    rspec-expectations (3.5.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.4.0)
-    rspec-mocks (3.4.1)
+      rspec-support (~> 3.5.0)
+    rspec-mocks (3.5.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.4.0)
-    rspec-support (3.4.1)
+      rspec-support (~> 3.5.0)
+    rspec-support (3.5.0)
     sinatra (1.4.7)
       rack (~> 1.5)
       rack-protection (~> 1.4)
       tilt (>= 1.3, < 3)
-    sqlite3 (1.3.11)
+    sqlite3 (1.3.12)
     thread_safe (0.3.5)
     tilt (2.0.5)
     timecop (0.8.1)
@@ -75,4 +75,4 @@ DEPENDENCIES
   timecop (>= 0.7)
 
 BUNDLED WITH
-   1.11.2
+   1.13.6
diff --git a/README.md b/README.md
index 4122955..2a61883 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ Currently, there is no such thing as Ruby Cron for Rails. Well, there's [Wheneve
 
 ## Requirements
 
-Tested with latest MRI Ruby 2.2+, Rails 4.\*, and Rails 5.\*.
+Tested with latest MRI Ruby 2.2+, 2.3+, Rails 4.\*, and Rails 5.\*.
 Other versions are untested but might work fine.