diff --git a/.changeset/fifty-bats-stare.md b/.changeset/fifty-bats-stare.md
new file mode 100644
index 0000000..25edd77
--- /dev/null
+++ b/.changeset/fifty-bats-stare.md
@@ -0,0 +1,5 @@
+---
+"single-spa-react": patch
+---
+
+Automatically support React 17 with default opts. Resolves #202
diff --git a/src/single-spa-react.js b/src/single-spa-react.js
index 64a5cd8..c999e82 100644
--- a/src/single-spa-react.js
+++ b/src/single-spa-react.js
@@ -36,7 +36,6 @@ const defaultOpts = {
   loadRootComponent: null,
 
   // optional opts
-  renderType: "createRoot",
   errorBoundary: null,
   errorBoundaryClass: null,
   domElementGetter: null,
@@ -68,6 +67,15 @@ function singleSpaReact(userOpts) {
     );
   }
 
+  if (!opts.renderType) {
+    // https://github.com/single-spa/single-spa-react/issues/202
+    if (opts.ReactDOMClient?.createRoot) {
+      opts.renderType = "createRoot";
+    } else {
+      opts.renderType = "render";
+    }
+  }
+
   if (!opts.rootComponent && !opts.loadRootComponent) {
     throw new Error(
       `single-spa-react must be passed opts.rootComponent or opts.loadRootComponent`