diff --git a/netlify.toml b/netlify.toml
index b46479f..31081c5 100644
--- a/netlify.toml
+++ b/netlify.toml
@@ -1,3 +1,6 @@
 [build]
   publish = "public"
-  command = "npm run build"
\ No newline at end of file
+  command = "npm run build"
+[build.environment]
+  YARN_VERSION = "1.3.2"
+  YARN_FLAGS = "--no-ignore-optional"