diff --git a/.tool-versions b/.tool-versions
index 886979a1..90e7dc59 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
-elixir 1.8.0
-erlang 21.2.2
+elixir 1.8.1-otp-21
+erlang 21.2.7
diff --git a/.travis.yml b/.travis.yml
index 914a4cec..6c924030 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,7 @@ language: elixir
 elixir:
   - 1.6.6
   - 1.7.4
-  - 1.8.0
+  - 1.8.1
 otp_release:
   - 20.3
   - 21.2