diff --git a/Gemfile.lock b/Gemfile.lock
index 5a1e4e1..bb87cc8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,9 +12,8 @@ GEM
     coderay (1.1.2)
     debug_inspector (0.0.3)
     diff-lcs (1.3)
-    docile (1.3.1)
+    docile (1.3.4)
     jaro_winkler (1.5.2)
-    json (2.2.0)
     method_source (0.9.2)
     parallel (1.17.0)
     parser (2.6.2.1)
@@ -50,11 +49,12 @@ GEM
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 1.6)
     ruby-progressbar (1.10.0)
-    simplecov (0.16.1)
+    simplecov (0.21.2)
       docile (~> 1.1)
-      json (>= 1.8, < 3)
-      simplecov-html (~> 0.10.0)
-    simplecov-html (0.10.2)
+      simplecov-html (~> 0.11)
+      simplecov_json_formatter (~> 0.1)
+    simplecov-html (0.12.3)
+    simplecov_json_formatter (0.1.2)
     standard (0.0.39)
       rubocop (~> 0.67.1)
     standardrb (1.0.0)