diff --git a/gemfiles/Gemfile-rails-4-1 b/gemfiles/Gemfile-rails-4-1
index 33fb7b57a..f164f8a9f 100644
--- a/gemfiles/Gemfile-rails-4-1
+++ b/gemfiles/Gemfile-rails-4-1
@@ -44,3 +44,6 @@ if RUBY_VERSION < "2.3.0"
   # `Object.deprecate_constant` which isn't available.
   gem "multipart-post", "2.1.1"
 end
+
+# There's a build incompatibility issue with nokogiri and loofah
+gem "loofah", "~> 2.20.0"
diff --git a/gemfiles/Gemfile-rails-4-2 b/gemfiles/Gemfile-rails-4-2
index d99d368cd..31205659c 100644
--- a/gemfiles/Gemfile-rails-4-2
+++ b/gemfiles/Gemfile-rails-4-2
@@ -43,3 +43,6 @@ if RUBY_VERSION < "2.3.0"
   # `Object.deprecate_constant` which isn't available.
   gem "multipart-post", "2.1.1"
 end
+
+# There's a build incompatibility issue with nokogiri and loofah
+gem "loofah", "~> 2.20.0"
diff --git a/gemfiles/Gemfile-rails-5-0 b/gemfiles/Gemfile-rails-5-0
index ea23acf74..7e3c3295d 100644
--- a/gemfiles/Gemfile-rails-5-0
+++ b/gemfiles/Gemfile-rails-5-0
@@ -35,3 +35,6 @@ if RUBY_VERSION < "2.3.0"
   # `Object.deprecate_constant` which isn't available.
   gem "multipart-post", "2.1.1"
 end
+
+# There's a build incompatibility issue with nokogiri and loofah
+gem "loofah", "~> 2.20.0"
diff --git a/gemfiles/Gemfile-rails-5-1 b/gemfiles/Gemfile-rails-5-1
index 9921633ec..bc85e0d42 100644
--- a/gemfiles/Gemfile-rails-5-1
+++ b/gemfiles/Gemfile-rails-5-1
@@ -28,3 +28,6 @@ if RUBY_VERSION < "2.3.0"
   # `Object.deprecate_constant` which isn't available.
   gem "multipart-post", "2.1.1"
 end
+
+# There's a build incompatibility issue with nokogiri and loofah
+gem "loofah", "~> 2.20.0"
diff --git a/gemfiles/Gemfile-rails-5-2 b/gemfiles/Gemfile-rails-5-2
index ef9f08fc1..0cfc29df8 100644
--- a/gemfiles/Gemfile-rails-5-2
+++ b/gemfiles/Gemfile-rails-5-2
@@ -22,3 +22,6 @@ end
 platforms :ruby do
   gem "sqlite3", "~> 1.3.6"
 end
+
+# There's a build incompatibility issue with nokogiri and loofah
+gem "loofah", "~> 2.20.0"