diff --git a/Gemfile.lock b/Gemfile.lock
index 621bead..0c727c0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -105,6 +105,8 @@ GEM
     nio4r (2.5.8)
     nokogiri (1.12.5-x86_64-darwin)
       racc (~> 1.4)
+    nokogiri (1.12.5-x86_64-linux)
+      racc (~> 1.4)
     pry (0.14.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -112,7 +114,7 @@ GEM
     puma (4.3.8)
       nio4r (~> 2.0)
     racc (1.5.2)
-    rack (2.2.3)
+    rack (2.2.6.3)
     rack-proxy (0.7.0)
       rack
     rack-test (1.1.0)
@@ -221,6 +223,7 @@ GEM
 
 PLATFORMS
   x86_64-darwin-18
+  x86_64-linux
 
 DEPENDENCIES
   bootsnap (>= 1.4.2)