diff --git a/Gemfile.lock b/Gemfile.lock
index 7d42211..6c151e6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,10 +2,9 @@ GEM
   remote: https://rubygems.org/
   specs:
     diff-lcs (1.2.5)
-    knapsack (1.6.0)
+    knapsack (1.22.0)
       rake
-      timecop (>= 0.1.0)
-    rake (13.0.6)
+    rake (13.3.0)
     rspec (3.4.0)
       rspec-core (~> 3.4.0)
       rspec-expectations (~> 3.4.0)
@@ -19,7 +18,6 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.4.0)
     rspec-support (3.4.1)
-    timecop (0.8.0)
 
 PLATFORMS
   ruby