diff --git a/.changeset/light-laws-compete.md b/.changeset/light-laws-compete.md
new file mode 100644
index 0000000..674a31a
--- /dev/null
+++ b/.changeset/light-laws-compete.md
@@ -0,0 +1,6 @@
+---
+"@sigmacomputing/react-embed-sdk": minor
+"@sigmacomputing/embed-sdk": minor
+---
+
+Fix mutation URL to production
diff --git a/packages/embed-sdk/src/mutations.ts b/packages/embed-sdk/src/mutations.ts
index f56d630..f9ecd3f 100644
--- a/packages/embed-sdk/src/mutations.ts
+++ b/packages/embed-sdk/src/mutations.ts
@@ -9,6 +9,8 @@ import {
   WorkbookVariablesUpdateEventName,
 } from "./types";
 
+let SIGMA_COMPUTING_URL = "https://app.sigmacomputing.com";
+
 const sendIframeMessage = (
   iframe: HTMLIFrameElement,
   message: { type: string; [key: string]: unknown },
@@ -16,10 +18,18 @@ const sendIframeMessage = (
   if (!iframe.contentWindow) {
     throw new Error("iframe contentWindow is not available");
   }
-  iframe.contentWindow.postMessage(
-    message,
-    "https://staging.sigmacomputing.io",
-  );
+  iframe.contentWindow.postMessage(message, SIGMA_COMPUTING_URL);
+};
+
+/**
+ * DO NOT USE IN PRODUCTION.
+ *
+ * This will override the Sigma Computing URL used for mutations.
+ *
+ * @param url the URL to use instead of the default
+ */
+export const DO_NOT_USE_IN_PRODUCTION_overrideMutationUrl = (url: string) => {
+  SIGMA_COMPUTING_URL = url;
 };
 
 export const workbookBookmarkCreate = (
diff --git a/packages/react-embed-sdk/package.json b/packages/react-embed-sdk/package.json
index eb27250..64ee59b 100644
--- a/packages/react-embed-sdk/package.json
+++ b/packages/react-embed-sdk/package.json
@@ -35,8 +35,8 @@
     "dist"
   ],
   "peerDependencies": {
-    "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0",
-    "react-dom": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+    "react": "^16.8.0 || ^17.0 || ^18.0 || ^19.0 || 19.0.0-rc",
+    "react-dom": "^16.8.0 || ^17.0 || ^18.0 || ^19.0 || 19.0.0-rc"
   },
   "devDependencies": {
     "@sigmacomputing/eslint-config": "workspace:*",
diff --git a/packages/react-embed-sdk/src/mutations.ts b/packages/react-embed-sdk/src/mutations.ts
index ae66afc..e506fc9 100644
--- a/packages/react-embed-sdk/src/mutations.ts
+++ b/packages/react-embed-sdk/src/mutations.ts
@@ -9,6 +9,8 @@ import {
   workbookSharingLinkUpdate,
 } from "@sigmacomputing/embed-sdk";
 
+export { DO_NOT_USE_IN_PRODUCTION_overrideMutationUrl } from "@sigmacomputing/embed-sdk";
+
 export function getWorkbookVariables(
   iframeRef: React.RefObject<HTMLIFrameElement>,
 ) {