diff --git a/netlify.toml b/netlify.toml
index 02bf2bc5..96c77b9b 100644
--- a/netlify.toml
+++ b/netlify.toml
@@ -1,4 +1,4 @@
 [build]
 command = "composer prod && yarn prod && cp -R source/dist output_prod"
 publish = "output_prod"
-environment = { PHP_VERSION = "7.2" }
+environment = { PHP_VERSION = "7.2", YARN_VERSION = "1.13.0" }