diff --git a/Gemfile.lock b/Gemfile.lock
index 8c64387..a697784 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -5,7 +5,7 @@ GEM
     knapsack (1.6.0)
       rake
       timecop (>= 0.1.0)
-    rake (10.5.0)
+    rake (13.0.6)
     rspec (3.4.0)
       rspec-core (~> 3.4.0)
       rspec-expectations (~> 3.4.0)