diff --git a/elixir_buildpack.config b/elixir_buildpack.config
index 6643794..1a8e255 100644
--- a/elixir_buildpack.config
+++ b/elixir_buildpack.config
@@ -1,5 +1,5 @@
 # Erlang version
-erlang_version=20.1
+erlang_version=23.2.3
 
 # Elixir version
-elixir_version=1.6.6
+elixir_version=1.11.3