diff --git a/Gemfile.lock b/Gemfile.lock
index 78ce2e255e..11111db0a2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,10 +10,9 @@ GEM
     ast (2.4.1)
     coderay (1.1.2)
     concurrent-ruby (1.1.8)
-    docile (1.3.2)
+    docile (1.3.5)
     i18n (1.8.8)
       concurrent-ruby (~> 1.0)
-    json (2.3.0)
     method_source (1.0.0)
     minitest (5.14.3)
     parallel (1.19.2)
@@ -39,11 +38,12 @@ GEM
     rubocop-ast (1.1.0)
       parser (>= 2.7.1.5)
     ruby-progressbar (1.10.1)
-    simplecov (0.17.1)
+    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)
     test-unit (3.3.8)
       power_assert
     timecop (0.9.2)
@@ -59,7 +59,7 @@ DEPENDENCIES
   pry (= 0.13.1)
   rake (= 13.0.3)
   rubocop (= 1.1.0)
-  simplecov (= 0.17.1)
+  simplecov (= 0.21.2)
   test-unit (= 3.3.8)
   timecop (= 0.9.2)
   yard (= 0.9.25)
diff --git a/faker.gemspec b/faker.gemspec
index 82edfe8008..58f4499855 100644
--- a/faker.gemspec
+++ b/faker.gemspec
@@ -33,7 +33,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency('pry', '0.13.1')
   spec.add_development_dependency('rake', '13.0.3')
   spec.add_development_dependency('rubocop', '1.1.0')
-  spec.add_development_dependency('simplecov', '0.17.1')
+  spec.add_development_dependency('simplecov', '0.21.2')
   spec.add_development_dependency('test-unit', '3.3.8')
   spec.add_development_dependency('timecop', '0.9.2')
   spec.add_development_dependency('yard', '0.9.25')