diff --git a/2021/.tool-versions b/2021/.tool-versions
index eda65d9..44810d5 100644
--- a/2021/.tool-versions
+++ b/2021/.tool-versions
@@ -1,2 +1,2 @@
 erlang 24.1.4
-elixir 1.12.3-otp-24
+elixir 1.13.0-otp-24