diff --git a/Library/Homebrew/test/Gemfile b/Library/Homebrew/test/Gemfile
index fb546a56a1..fb783b9b2f 100644
--- a/Library/Homebrew/test/Gemfile
+++ b/Library/Homebrew/test/Gemfile
@@ -3,5 +3,16 @@ source "https://rubygems.org"
 gem "mocha", "~> 1.1"
 gem "minitest", "~> 5.3"
 gem "rake", "~> 10.3"
-gem "simplecov", "~> 0.10.0", :require => false
-gem "coveralls", "0.8.9", :require => false
+# This is a patched version of the v0.11.2. Switch back to the stable version
+# when #436 has been merged upstream.
+# https://github.com/colszowka/simplecov/pull/436
+# See also https://github.com/Homebrew/homebrew/pull/48250#issuecomment-173171990
+gem "simplecov", "0.11.2",
+  :git => "https://github.com/Homebrew/simplecov.git",
+  :branch => "tracked-files-root-fix",
+  :require => false
+gem "coveralls", "0.8.10", :require => false
+# We need to pin these versions because those are the last supporting Ruby 1.8.
+# Remove these lines when we've stopped supporting it.
+gem "mime-types", "~> 1.16"
+gem "rest-client", "1.6.9"
diff --git a/Library/Homebrew/test/Gemfile.lock b/Library/Homebrew/test/Gemfile.lock
index d897f0c9b3..71ac06f705 100644
--- a/Library/Homebrew/test/Gemfile.lock
+++ b/Library/Homebrew/test/Gemfile.lock
@@ -1,10 +1,20 @@
+GIT
+  remote: https://github.com/Homebrew/simplecov.git
+  revision: 4c7642496e902ba9028a74500971e40b3e3aaa29
+  branch: tracked-files-root-fix
+  specs:
+    simplecov (0.11.2)
+      docile (~> 1.1.0)
+      json (~> 1.8)
+      simplecov-html (~> 0.10.0)
+
 GEM
   remote: https://rubygems.org/
   specs:
-    coveralls (0.8.9)
+    coveralls (0.8.10)
       json (~> 1.8)
       rest-client (>= 1.6.8, < 2)
-      simplecov (~> 0.10.0)
+      simplecov (~> 0.11.0)
       term-ansicolor (~> 1.3)
       thor (~> 0.19.1)
       tins (~> 1.6.0)
@@ -12,16 +22,12 @@ GEM
     json (1.8.3)
     metaclass (0.0.4)
     mime-types (1.25.1)
-    minitest (5.8.3)
+    minitest (5.8.4)
     mocha (1.1.0)
       metaclass (~> 0.0.1)
-    rake (10.4.2)
+    rake (10.5.0)
     rest-client (1.6.9)
       mime-types (~> 1.16)
-    simplecov (0.10.0)
-      docile (~> 1.1.0)
-      json (~> 1.8)
-      simplecov-html (~> 0.10.0)
     simplecov-html (0.10.0)
     term-ansicolor (1.3.2)
       tins (~> 1.0)
@@ -32,11 +38,13 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  coveralls (= 0.8.9)
+  coveralls (= 0.8.10)
+  mime-types (~> 1.16)
   minitest (~> 5.3)
   mocha (~> 1.1)
   rake (~> 10.3)
-  simplecov (~> 0.10.0)
+  rest-client (= 1.6.9)
+  simplecov (= 0.11.2)!
 
 BUNDLED WITH
    1.11.2