diff --git a/Gemfile.lock b/Gemfile.lock
index be994e2..11adf0a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,7 +10,6 @@ GEM
     awesome_print (1.9.2)
     bigdecimal (3.1.8)
     builder (3.3.0)
-    docile (1.4.0)
     minitest (5.25.1)
     minitest-reporters (1.7.1)
       ansi
@@ -23,12 +22,7 @@ GEM
     ostruct (0.6.0)
     rake (13.2.1)
     ruby-progressbar (1.13.0)
-    simplecov (0.22.0)
-      docile (~> 1.1)
-      simplecov-html (~> 0.11)
-      simplecov_json_formatter (~> 0.1)
-    simplecov-html (0.12.3)
-    simplecov_json_formatter (0.1.4)
+    simplecov (1.0.2)
 
 PLATFORMS
   x64-mingw32