diff --git a/Gemfile.lock b/Gemfile.lock
index e9d82270a0..6a61234b9b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,7 +10,7 @@ GEM
     ast (2.4.2)
     coderay (1.1.3)
     concurrent-ruby (1.1.10)
-    docile (1.3.2)
+    docile (1.4.0)
     i18n (1.12.0)
       concurrent-ruby (~> 1.0)
     json (2.6.2)
@@ -42,11 +42,12 @@ GEM
     rubocop-rake (0.6.0)
       rubocop (~> 1.0)
     ruby-progressbar (1.11.0)
-    simplecov (0.17.1)
+    simplecov (0.21.1)
       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 (0.1.4)
     test-unit (3.5.3)
       power_assert
     timecop (0.9.5)
@@ -65,7 +66,7 @@ DEPENDENCIES
   rake (= 13.0.6)
   rubocop (= 1.36.0)
   rubocop-rake (= 0.6.0)
-  simplecov (= 0.17.1, < 0.18)
+  simplecov (= 0.21.1, < 0.22)
   test-unit (= 3.5.3)
   timecop (= 0.9.5)
   yard (= 0.9.27)
diff --git a/faker.gemspec b/faker.gemspec
index 0087b9d574..e7fe0fd655 100644
--- a/faker.gemspec
+++ b/faker.gemspec
@@ -39,7 +39,7 @@ Gem::Specification.new do |spec|
   # Workaround for cc-test-reporter with SimpleCov 0.18.
   # Stop upgrading SimpleCov until the following issue will be resolved.
   # https://github.com/codeclimate/test-reporter/issues/418
-  spec.add_development_dependency('simplecov', '0.17.1', '< 0.18')
+  spec.add_development_dependency('simplecov', '0.21.1', '< 0.22')
   spec.add_development_dependency('test-unit', '3.5.3')
   spec.add_development_dependency('timecop', '0.9.5')
   spec.add_development_dependency('yard', '0.9.27')