diff --git a/Gemfile.lock b/Gemfile.lock
index 7af326d..11a7b1f 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -68,7 +68,7 @@ GEM
       tzinfo (~> 2.0)
     addressable (2.8.6)
       public_suffix (>= 2.0.2, < 6.0)
-    appsignal (3.7.5)
+    appsignal (4.0.5)
       rack
     ast (2.4.2)
     base64 (0.2.0)