diff --git a/Gemfile.lock b/Gemfile.lock
index c975eaa..164cc10 100644
--- a/Gemfile.lock
+++ b/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
@@ -114,7 +114,7 @@ GEM
       ast (~> 2.4.1)
     powerpack (0.1.3)
     racc (1.6.0)
-    rack (2.2.3)
+    rack (2.2.6.2)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (6.1.4.7)