diff --git a/.tool-versions b/.tool-versions
index 87b3619..12f88f1 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,4 +1,4 @@
-elixir 1.11.3
+elixir 1.11.4
 python 2.7.14
 nodejs 10.16.0
 erlang 23.2.3
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..811df21
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1 @@
+FROM elixir:1.11.4