diff --git a/Gemfile b/Gemfile
index 434f8b3cb..b0a77d992 100644
--- a/Gemfile
+++ b/Gemfile
@@ -27,7 +27,7 @@ gem 'jquery-rails', '~> 4.3.1'
 gem 'rails_autolink', '~> 1.1.6'
 gem 'qa', '~> 1.1.0'
 gem 'sprockets', '~> 2.12.4'  # locked
-gem 'rack-dev-mark', '~> 0.7.5'
+gem 'rack-dev-mark', '~> 0.7.7'
 
 # Deploy with Capistrano
 gem 'capistrano', '~> 3.8.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index 189427449..4a954a648 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -270,8 +270,8 @@ GEM
       rails (>= 4.2.0, < 6.0)
       rdf
     rack (1.6.10)
-    rack-dev-mark (0.7.5)
-      rack (>= 1.1)
+    rack-dev-mark (0.7.7)
+      rack (>= 1.1, < 2.1)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.10)
@@ -467,7 +467,7 @@ DEPENDENCIES
   poltergeist (= 1.15.0)
   pry (~> 0.10.4)
   qa (~> 1.1.0)
-  rack-dev-mark (~> 0.7.5)
+  rack-dev-mark (~> 0.7.7)
   rails (~> 4.2.10)
   rails_autolink (~> 1.1.6)
   rake (~> 12.3.1)