diff --git a/intro/part4/elm.json b/intro/part4/elm.json
index dbb2af2..a6c7eae 100644
--- a/intro/part4/elm.json
+++ b/intro/part4/elm.json
@@ -3,7 +3,7 @@
     "source-directories": [
         "src"
     ],
-    "elm-version": "1.19.0",
+    "elm-version": "0.19.1",
     "dependencies": {
         "direct": {
             "elm/browser": "1.0.0",