diff --git a/ruby-2.2-slim-dev/Gemfile.lock b/ruby-2.2-slim-dev/Gemfile.lock
index c508333..2692cc8 100644
--- a/ruby-2.2-slim-dev/Gemfile.lock
+++ b/ruby-2.2-slim-dev/Gemfile.lock
@@ -181,6 +181,7 @@ GEM
     columnize (0.9.0)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
+    crass (1.0.5)
     curb (0.8.8)
     database_cleaner (1.6.1)
     debug_inspector (0.0.2)
@@ -410,7 +411,8 @@ GEM
     letter_opener (1.4.1)
       launchy (~> 2.2)
     libv8 (3.16.14.17)
-    loofah (2.0.2)
+    loofah (2.4.0)
+      crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.6.3)
       mime-types (>= 1.16, < 3)