diff --git a/puma/tests/docker/Gemfile.lock b/puma/tests/docker/Gemfile.lock
index aea867e5d5..ff8f7e3cc8 100644
--- a/puma/tests/docker/Gemfile.lock
+++ b/puma/tests/docker/Gemfile.lock
@@ -6,7 +6,7 @@ GEM
     nio4r (2.5.8)
     puma (5.6.2)
       nio4r (~> 2.0)
-    rack (2.2.3)
+    rack (2.2.6.4)
     rack-protection (2.2.0)
       rack
     ruby2_keywords (0.0.5)