diff --git a/gems.locked b/gems.locked
index 17c91bd..c8c3d5a 100644
--- a/gems.locked
+++ b/gems.locked
@@ -53,19 +53,19 @@ GEM
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
     redcarpet (3.4.0)
-    rspec (3.8.0)
-      rspec-core (~> 3.8.0)
-      rspec-expectations (~> 3.8.0)
-      rspec-mocks (~> 3.8.0)
-    rspec-core (3.8.0)
-      rspec-support (~> 3.8.0)
-    rspec-expectations (3.8.1)
+    rspec (3.9.0)
+      rspec-core (~> 3.9.0)
+      rspec-expectations (~> 3.9.0)
+      rspec-mocks (~> 3.9.0)
+    rspec-core (3.9.0)
+      rspec-support (~> 3.9.0)
+    rspec-expectations (3.9.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-mocks (3.8.0)
+      rspec-support (~> 3.9.0)
+    rspec-mocks (3.9.0)
       diff-lcs (>= 1.2.0, < 2.0)
-      rspec-support (~> 3.8.0)
-    rspec-support (3.8.0)
+      rspec-support (~> 3.9.0)
+    rspec-support (3.9.0)
     rubocop (0.58.2)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
@@ -115,7 +115,7 @@ DEPENDENCIES
   pry (~> 0.11)
   pry-coolline (~> 0.2)
   redcarpet (~> 3.4)
-  rspec (~> 3.7)
+  rspec (~> 3.9)
   rubocop (~> 0.56)
   sham (~> 2.0)
   yard (~> 0.9)
diff --git a/gems.rb b/gems.rb
index 772a0b0..60484d2 100644
--- a/gems.rb
+++ b/gems.rb
@@ -29,6 +29,6 @@
 end
 
 group :development, :test do
-  gem 'rspec', '~> 3.7'
+  gem 'rspec', '~> 3.9'
   gem 'sham', '~> 2.0'
 end