diff --git a/fixtures/rails51_webpacker/Gemfile.lock b/fixtures/rails51_webpacker/Gemfile.lock
index f63297c9a..30e467166 100644
--- a/fixtures/rails51_webpacker/Gemfile.lock
+++ b/fixtures/rails51_webpacker/Gemfile.lock
@@ -83,14 +83,16 @@ GEM
       mini_mime (>= 0.1.1)
     method_source (0.9.0)
     mini_mime (1.0.0)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.8.5)
     minitest (5.11.1)
     multi_json (1.13.1)
     nio4r (2.2.0)
-    nokogiri (1.8.1)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.15.5)
+      mini_portile2 (~> 2.8.2)
+      racc (~> 1.4)
     public_suffix (3.0.1)
     puma (3.11.2)
+    racc (1.7.3)
     rack (2.0.3)
     rack-proxy (0.6.3)
       rack