diff --git a/compiled/facebook-www/REVISION b/compiled/facebook-www/REVISION
index 542f0b4ea6..052e04d269 100644
--- a/compiled/facebook-www/REVISION
+++ b/compiled/facebook-www/REVISION
@@ -1 +1 @@
-3f9e237a2feb74f1fca23b76d9d2e9e1713e2ba1
+ed3c65caf042f75fe2fdc2a5e568a9624c6175fb
diff --git a/compiled/facebook-www/React-dev.classic.js b/compiled/facebook-www/React-dev.classic.js
index 476d37142c..0a528e65d4 100644
--- a/compiled/facebook-www/React-dev.classic.js
+++ b/compiled/facebook-www/React-dev.classic.js
@@ -24,7 +24,7 @@ if (__DEV__) {
     ) {
       __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStart(new Error());
     }
-    var ReactVersion = "19.0.0-www-classic-8d3386cf";
+    var ReactVersion = "19.0.0-www-classic-e2f5fe42";
 
     // ATTENTION
     // When adding new symbols to this file,
@@ -1292,6 +1292,7 @@ if (__DEV__) {
     var specialPropRefWarningShown;
     var didWarnAboutStringRefs;
     var didWarnAboutElementRef;
+    var didWarnAboutOldJSXRuntime;
 
     {
       didWarnAboutStringRefs = {};
@@ -1894,6 +1895,27 @@ if (__DEV__) {
       var ref = null;
 
       if (config != null) {
+        {
+          if (
+            !didWarnAboutOldJSXRuntime &&
+            "__self" in config && // Do not assume this is the result of an oudated JSX transform if key
+            // is present, because the modern JSX transform sometimes outputs
+            // createElement to preserve precedence between a static key and a
+            // spread key. To avoid false positive warnings, we never warn if
+            // there's a key.
+            !("key" in config)
+          ) {
+            didWarnAboutOldJSXRuntime = true;
+
+            warn(
+              "Your app (or one of its dependencies) is using an outdated JSX " +
+                "transform. Update to the modern JSX transform for " +
+                "faster performance: " + // TODO: Create a short link for this
+                "https://reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html"
+            );
+          }
+        }
+
         if (hasValidRef(config)) {
           if (!enableRefAsProp) {
             ref = config.ref;
diff --git a/compiled/facebook-www/React-dev.modern.js b/compiled/facebook-www/React-dev.modern.js
index 3e9abaaec8..d19ef6b0a0 100644
--- a/compiled/facebook-www/React-dev.modern.js
+++ b/compiled/facebook-www/React-dev.modern.js
@@ -24,7 +24,7 @@ if (__DEV__) {
     ) {
       __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStart(new Error());
     }
-    var ReactVersion = "19.0.0-www-modern-337e1422";
+    var ReactVersion = "19.0.0-www-modern-cd353aaf";
 
     // ATTENTION
     // When adding new symbols to this file,
@@ -1294,6 +1294,7 @@ if (__DEV__) {
     var specialPropRefWarningShown;
     var didWarnAboutStringRefs;
     var didWarnAboutElementRef;
+    var didWarnAboutOldJSXRuntime;
 
     {
       didWarnAboutStringRefs = {};
@@ -1896,6 +1897,27 @@ if (__DEV__) {
       var ref = null;
 
       if (config != null) {
+        {
+          if (
+            !didWarnAboutOldJSXRuntime &&
+            "__self" in config && // Do not assume this is the result of an oudated JSX transform if key
+            // is present, because the modern JSX transform sometimes outputs
+            // createElement to preserve precedence between a static key and a
+            // spread key. To avoid false positive warnings, we never warn if
+            // there's a key.
+            !("key" in config)
+          ) {
+            didWarnAboutOldJSXRuntime = true;
+
+            warn(
+              "Your app (or one of its dependencies) is using an outdated JSX " +
+                "transform. Update to the modern JSX transform for " +
+                "faster performance: " + // TODO: Create a short link for this
+                "https://reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html"
+            );
+          }
+        }
+
         if (hasValidRef(config)) {
           if (!enableRefAsProp) {
             ref = config.ref;
diff --git a/compiled/facebook-www/ReactServer-dev.modern.js b/compiled/facebook-www/ReactServer-dev.modern.js
index 7dcf3801e5..2bde6a19a3 100644
--- a/compiled/facebook-www/ReactServer-dev.modern.js
+++ b/compiled/facebook-www/ReactServer-dev.modern.js
@@ -1018,6 +1018,7 @@ if (__DEV__) {
     var specialPropRefWarningShown;
     var didWarnAboutStringRefs;
     var didWarnAboutElementRef;
+    var didWarnAboutOldJSXRuntime;
 
     {
       didWarnAboutStringRefs = {};
@@ -1620,6 +1621,27 @@ if (__DEV__) {
       var ref = null;
 
       if (config != null) {
+        {
+          if (
+            !didWarnAboutOldJSXRuntime &&
+            "__self" in config && // Do not assume this is the result of an oudated JSX transform if key
+            // is present, because the modern JSX transform sometimes outputs
+            // createElement to preserve precedence between a static key and a
+            // spread key. To avoid false positive warnings, we never warn if
+            // there's a key.
+            !("key" in config)
+          ) {
+            didWarnAboutOldJSXRuntime = true;
+
+            warn(
+              "Your app (or one of its dependencies) is using an outdated JSX " +
+                "transform. Update to the modern JSX transform for " +
+                "faster performance: " + // TODO: Create a short link for this
+                "https://reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html"
+            );
+          }
+        }
+
         if (hasValidRef(config)) {
           if (!enableRefAsProp) {
             ref = config.ref;
@@ -3083,7 +3105,7 @@ if (__DEV__) {
 
     function noop() {}
 
-    var ReactVersion = "19.0.0-www-modern-a3494f1d";
+    var ReactVersion = "19.0.0-www-modern-6d726a4f";
 
     // Patch fetch
     var Children = {
diff --git a/compiled/facebook-www/__test_utils__/ReactAllWarnings.js b/compiled/facebook-www/__test_utils__/ReactAllWarnings.js
index acf0b8123e..cebb933df7 100644
--- a/compiled/facebook-www/__test_utils__/ReactAllWarnings.js
+++ b/compiled/facebook-www/__test_utils__/ReactAllWarnings.js
@@ -345,6 +345,7 @@ export default [
   "You provided a `value` prop to a form field without an `onChange` handler. This will render a read-only field. If the field should be mutable use `defaultValue`. Otherwise, set `onChange`.",
   "You provided a `value` prop to a form field without an `onChange` handler. This will render a read-only field. If the field should be mutable use `defaultValue`. Otherwise, set either `onChange` or `readOnly`.",
   "You seem to have overlapping act() calls, this is not supported. Be sure to await previous act() calls before making a new one. ",
+  "Your app (or one of its dependencies) is using an outdated JSX transform. Update to the modern JSX transform for faster performance: https://reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html",
   "`%s` uses `getDerivedStateFromProps` but its initial state is %s. This is not recommended. Instead, define the initial state by assigning an object to `this.state` in the constructor of `%s`. This ensures that `getDerivedStateFromProps` arguments have a consistent shape.",
   "`Infinity` is an invalid value for the `%s` css style property.",
   "`NaN` is an invalid value for the `%s` css style property.",