diff --git a/.changeset/chatty-eels-flow.md b/.changeset/chatty-eels-flow.md
new file mode 100644
index 000000000..f97438041
--- /dev/null
+++ b/.changeset/chatty-eels-flow.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/cloudflare': minor
+---
+
+Make Cloudflare adapter compatible with React 19 (useActionState, etc.) by switching to React's edge renderer for SSR
diff --git a/packages/cloudflare/src/index.ts b/packages/cloudflare/src/index.ts
index 4facef327..bd7366cbe 100644
--- a/packages/cloudflare/src/index.ts
+++ b/packages/cloudflare/src/index.ts
@@ -219,7 +219,7 @@ export default function createIntegration(args?: Options): AstroIntegration {
 					const aliases = [
 						{
 							find: 'react-dom/server',
-							replacement: 'react-dom/server.browser',
+							replacement: 'react-dom/server.edge',
 						},
 					];