diff --git a/pkgs/development/interpreters/elixir/1.6.nix b/pkgs/development/interpreters/elixir/1.6.nix
index ebd6a7ea51103f..73afcbd1597e82 100644
--- a/pkgs/development/interpreters/elixir/1.6.nix
+++ b/pkgs/development/interpreters/elixir/1.6.nix
@@ -1,7 +1,7 @@
 { mkDerivation }:
 
 mkDerivation rec {
-  version = "1.6.5";
-  sha256 = "0il1fraz6c8qbqv4wrp16jqrkf3xglfa9f3sdm6q4vv8kjf3lxxb";
+  version = "1.6.6";
+  sha256 = "1wl8rfpw0dxacq4f7xf6wjr8v2ww5691d0cfw9pzw7phd19vazgl";
   minimumOTPVersion = "19";
 }