diff --git a/examples/determinator-rails/Gemfile.lock b/examples/determinator-rails/Gemfile.lock
index 1878a67..3de2a4f 100644
--- a/examples/determinator-rails/Gemfile.lock
+++ b/examples/determinator-rails/Gemfile.lock
@@ -68,7 +68,7 @@ GEM
       activesupport (>= 4.2.0)
     i18n (1.8.7)
       concurrent-ruby (~> 1.0)
-    loofah (2.9.0)
+    loofah (2.19.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)
@@ -81,10 +81,12 @@ GEM
     minitest (5.14.3)
     multipart-post (2.1.1)
     nio4r (2.5.4)
-    nokogiri (1.11.1-x86_64-darwin)
+    nokogiri (1.13.10-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.13.10-x86_64-linux)
       racc (~> 1.4)
     puma (3.12.6)
-    racc (1.5.2)
+    racc (1.6.1)
     rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -132,6 +134,7 @@ GEM
 
 PLATFORMS
   x86_64-darwin-19
+  x86_64-linux
 
 DEPENDENCIES
   byebug