diff --git a/study_guides/rails/99cats_debugger/Gemfile.lock b/study_guides/rails/99cats_debugger/Gemfile.lock
index d341faf47..484f5f9f9 100644
--- a/study_guides/rails/99cats_debugger/Gemfile.lock
+++ b/study_guides/rails/99cats_debugger/Gemfile.lock
@@ -100,11 +100,12 @@ GEM
     method_source (0.9.2)
     mimemagic (0.3.3)
     mini_mime (1.0.2)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.8.0)
     minitest (5.11.3)
     nio4r (2.5.2)
-    nokogiri (1.10.9)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.13.4)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
     pg (1.1.4)
     pry (0.12.2)
       coderay (~> 1.1.0)
@@ -114,6 +115,7 @@ GEM
     public_suffix (3.1.1)
     puma (4.3.5)
       nio4r (~> 2.0)
+    racc (1.6.0)
     rack (2.2.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)