diff --git a/Gemfile.lock b/Gemfile.lock
index f308313c..af26994f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -80,7 +80,6 @@ GEM
     i18n (1.7.0)
       concurrent-ruby (~> 1.0)
     jaro_winkler (1.5.4)
-    json (2.2.0)
     loofah (2.4.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
@@ -151,11 +150,10 @@ GEM
     rubocop-performance (1.5.1)
       rubocop (>= 0.71.0)
     ruby-progressbar (1.10.1)
-    simplecov (0.17.0)
+    simplecov (0.18.0)
       docile (~> 1.1)
-      json (>= 1.8, < 3)
-      simplecov-html (~> 0.10.0)
-    simplecov-html (0.10.2)
+      simplecov-html (~> 0.11.0)
+    simplecov-html (0.11.0)
     sprockets (4.0.0)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
diff --git a/test/helper.rb b/test/helper.rb
index 39749a17..641352a4 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -13,6 +13,7 @@ ENV["N"] = "0"
 if ENV["COVERAGE"]
   require 'simplecov'
   SimpleCov.start do
+    enable_coverage :branch
     add_filter "/test/"
     add_filter "/myapp/"
   end