diff --git a/spec/test_app/Gemfile.lock b/spec/test_app/Gemfile.lock
index c7e5660..a92a310 100644
--- a/spec/test_app/Gemfile.lock
+++ b/spec/test_app/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: ../..
   specs:
     iban_bic (1.4.4)
-      rails (~> 6.1)
+      rails (>= 5.1)
       regexp-examples (~> 1.3)
 
 GEM
@@ -91,7 +91,7 @@ GEM
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     racc (1.6.0)
-    rack (2.2.3)
+    rack (2.2.6.3)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (6.1.4.7)