diff --git a/projects/prison-identifier-and-delius/tech-docs/Gemfile.lock b/projects/prison-identifier-and-delius/tech-docs/Gemfile.lock
index 689cb1479f..180537eba8 100644
--- a/projects/prison-identifier-and-delius/tech-docs/Gemfile.lock
+++ b/projects/prison-identifier-and-delius/tech-docs/Gemfile.lock
@@ -138,7 +138,7 @@ GEM
     parslet (2.0.0)
     public_suffix (5.0.1)
     racc (1.7.3)
-    rack (2.2.6.4)
+    rack (2.2.8.1)
     rack-livereload (0.3.17)
       rack
     rb-fsevent (0.11.2)