diff --git a/study_guides/react_redux/pokedex_debugger/Gemfile.lock b/study_guides/react_redux/pokedex_debugger/Gemfile.lock
index 74288a1c5..953bc342f 100644
--- a/study_guides/react_redux/pokedex_debugger/Gemfile.lock
+++ b/study_guides/react_redux/pokedex_debugger/Gemfile.lock
@@ -95,7 +95,7 @@ GEM
     pg (1.1.4)
     public_suffix (4.0.1)
     puma (3.12.6)
-    rack (2.2.3)
+    rack (2.2.6.4)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.1.7)