diff --git a/gemfiles/rails_4_2.gemfile b/gemfiles/rails_4_2.gemfile
index 9b0ba39a7..4baedc63d 100644
--- a/gemfiles/rails_4_2.gemfile
+++ b/gemfiles/rails_4_2.gemfile
@@ -36,7 +36,7 @@ end
 
 group :test do
   gem "rails-controller-testing"
-  gem "simplecov", require: false
+  gem "simplecov", "~> 0.10", "< 0.18", require: false
 end
 
 group :development do
diff --git a/gemfiles/rails_4_2_mongoid_5.gemfile b/gemfiles/rails_4_2_mongoid_5.gemfile
index 341abefc0..959bb3fd6 100644
--- a/gemfiles/rails_4_2_mongoid_5.gemfile
+++ b/gemfiles/rails_4_2_mongoid_5.gemfile
@@ -35,7 +35,7 @@ end
 
 group :test do
   gem "rails-controller-testing"
-  gem "simplecov", require: false
+  gem "simplecov", "~> 0.10", "< 0.18", require: false
 end
 
 group :development do
diff --git a/gemfiles/rails_5_0.gemfile b/gemfiles/rails_5_0.gemfile
index f19f8cddb..d5099022f 100644
--- a/gemfiles/rails_5_0.gemfile
+++ b/gemfiles/rails_5_0.gemfile
@@ -36,7 +36,7 @@ end
 
 group :test do
   gem "rails-controller-testing"
-  gem "simplecov", require: false
+  gem "simplecov", "~> 0.10", "< 0.18", require: false
 end
 
 group :development do
diff --git a/gemfiles/rails_5_1.gemfile b/gemfiles/rails_5_1.gemfile
index 5e3856e4c..2ef986796 100644
--- a/gemfiles/rails_5_1.gemfile
+++ b/gemfiles/rails_5_1.gemfile
@@ -36,7 +36,7 @@ end
 
 group :test do
   gem "rails-controller-testing"
-  gem "simplecov", require: false
+  gem "simplecov", "~> 0.10", "< 0.18", require: false
 end
 
 group :development do
diff --git a/gemfiles/rails_5_1_mongoid_6.gemfile b/gemfiles/rails_5_1_mongoid_6.gemfile
index 2e411b7e2..5536dbe93 100644
--- a/gemfiles/rails_5_1_mongoid_6.gemfile
+++ b/gemfiles/rails_5_1_mongoid_6.gemfile
@@ -35,7 +35,7 @@ end
 
 group :test do
   gem "rails-controller-testing"
-  gem "simplecov", require: false
+  gem "simplecov", "~> 0.10", "< 0.18", require: false
 end
 
 group :development do
diff --git a/gemfiles/rails_5_1_mongoid_7.gemfile b/gemfiles/rails_5_1_mongoid_7.gemfile
index 848182b21..6370f485f 100644
--- a/gemfiles/rails_5_1_mongoid_7.gemfile
+++ b/gemfiles/rails_5_1_mongoid_7.gemfile
@@ -35,7 +35,7 @@ end
 
 group :test do
   gem "rails-controller-testing"
-  gem "simplecov", require: false
+  gem "simplecov", "~> 0.10", "< 0.18", require: false
 end
 
 group :development do
diff --git a/gemfiles/rails_5_2.gemfile b/gemfiles/rails_5_2.gemfile
index cfa81a8f2..fca052e9e 100644
--- a/gemfiles/rails_5_2.gemfile
+++ b/gemfiles/rails_5_2.gemfile
@@ -36,7 +36,7 @@ end
 
 group :test do
   gem "rails-controller-testing"
-  gem "simplecov", require: false
+  gem "simplecov", "~> 0.10", "< 0.18", require: false
 end
 
 group :development do
diff --git a/gemfiles/rails_5_2_mongoid_6.gemfile b/gemfiles/rails_5_2_mongoid_6.gemfile
index 4f44084b4..8ec6a489c 100644
--- a/gemfiles/rails_5_2_mongoid_6.gemfile
+++ b/gemfiles/rails_5_2_mongoid_6.gemfile
@@ -35,7 +35,7 @@ end
 
 group :test do
   gem "rails-controller-testing"
-  gem "simplecov", require: false
+  gem "simplecov", "~> 0.10", "< 0.18", require: false
 end
 
 group :development do
diff --git a/gemfiles/rails_5_2_mongoid_7.gemfile b/gemfiles/rails_5_2_mongoid_7.gemfile
index e65f4535f..854f0444e 100644
--- a/gemfiles/rails_5_2_mongoid_7.gemfile
+++ b/gemfiles/rails_5_2_mongoid_7.gemfile
@@ -35,7 +35,7 @@ end
 
 group :test do
   gem "rails-controller-testing"
-  gem "simplecov", require: false
+  gem "simplecov", "~> 0.10", "< 0.18", require: false
 end
 
 group :development do
diff --git a/gemfiles/rails_6_0.gemfile b/gemfiles/rails_6_0.gemfile
index 65e6965bd..f9e6ec663 100644
--- a/gemfiles/rails_6_0.gemfile
+++ b/gemfiles/rails_6_0.gemfile
@@ -36,7 +36,7 @@ end
 
 group :test do
   gem "rails-controller-testing"
-  gem "simplecov", "< 0.18", require: false
+  gem "simplecov", "~> 0.10", "< 0.18", require: false
 end
 
 group :development do
diff --git a/gemfiles/rails_6_0_mongoid_7.gemfile b/gemfiles/rails_6_0_mongoid_7.gemfile
index eb4a3e82f..5a77d0c04 100644
--- a/gemfiles/rails_6_0_mongoid_7.gemfile
+++ b/gemfiles/rails_6_0_mongoid_7.gemfile
@@ -35,7 +35,7 @@ end
 
 group :test do
   gem "rails-controller-testing"
-  gem "simplecov", require: false
+  gem "simplecov", "~> 0.10", "< 0.18", require: false
 end
 
 group :development do