diff --git a/mix.lock b/mix.lock
index ff40e80..dca79da 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,2 +1,2 @@
 %{"eiconv": {:git, "https://github.com/zotonic/eiconv.git", "644fb5e7bd6640fbd073f4d28957914ea979aea0", []},
-  "gen_smtp": {:hex, :gen_smtp, "0.9.0"}}
+  "gen_smtp": {:hex, :gen_smtp, "0.11.0", "d90ff2f021fc86cb2a4259b1f2b177ab6e506676265e26454bf5755855adc956", [:rebar3], []}}