diff --git a/Gemfile.lock b/Gemfile.lock
index aedf0d0..653034e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -296,9 +296,9 @@ GEM
     shoulda-context (1.2.2)
     shoulda-matchers (2.8.0)
       activesupport (>= 3.0.0)
-    simple_form (3.5.1)
-      actionpack (> 4, < 5.2)
-      activemodel (> 4, < 5.2)
+    simple_form (4.0.1)
+      actionpack (>= 5.0)
+      activemodel (>= 5.0)
     simplecov (0.16.1)
       docile (~> 1.1)
       json (>= 1.8, < 3)