diff --git a/Libraries/Renderer/REVISION b/Libraries/Renderer/REVISION
index 40caea450f3..be9f717f7f4 100644
--- a/Libraries/Renderer/REVISION
+++ b/Libraries/Renderer/REVISION
@@ -1 +1 @@
-459c34fde6e22475b09e7215c8d35a513c4fa7b4
\ No newline at end of file
+2d8d133e1756ea50a48e615db0c22870e92f4af6
\ No newline at end of file
diff --git a/Libraries/Renderer/implementations/ReactFabric-dev.fb.js b/Libraries/Renderer/implementations/ReactFabric-dev.fb.js
index 3bad11c292f..d43ff6ad001 100644
--- a/Libraries/Renderer/implementations/ReactFabric-dev.fb.js
+++ b/Libraries/Renderer/implementations/ReactFabric-dev.fb.js
@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<4d9eb77d05517d9f9d1fbc421949ae0e>>
+ * @generated SignedSource<<3836d5af681381d070c07bf87c303843>>
  */
 
 'use strict';
@@ -5812,7 +5812,7 @@ var Passive$1 =
   /*   */
   4;
 
-var ReactVersion = "17.0.3-459c34fde";
+var ReactVersion = "17.0.3-2d8d133e1";
 
 var ReactCurrentBatchConfig = ReactSharedInternals.ReactCurrentBatchConfig;
 var NoTransition = 0;
@@ -21167,7 +21167,12 @@ function createHostRootFiber(
       }
     }
 
-    {
+    if (
+      // We only use this flag for our repo tests to check both behaviors.
+      // TODO: Flip this flag and rename it something like "forceConcurrentByDefaultForTesting"
+      // Only for internal experiments.
+      concurrentUpdatesByDefaultOverride
+    ) {
       mode |= ConcurrentUpdatesByDefaultMode;
     }
   } else {
@@ -21519,7 +21524,11 @@ function createFiberRoot(
   var root = new FiberRootNode(containerInfo, tag, hydrate);
   // stateNode is any.
 
-  var uninitializedFiber = createHostRootFiber(tag, isStrictMode);
+  var uninitializedFiber = createHostRootFiber(
+    tag,
+    isStrictMode,
+    concurrentUpdatesByDefaultOverride
+  );
   root.current = uninitializedFiber;
   uninitializedFiber.stateNode = root;
 
@@ -21665,7 +21674,8 @@ function createContainer(
     tag,
     hydrate,
     hydrationCallbacks,
-    isStrictMode
+    isStrictMode,
+    concurrentUpdatesByDefaultOverride
   );
 }
 function updateContainer(element, container, parentComponent, callback) {
@@ -22435,7 +22445,8 @@ function render(element, containerTag, callback, concurrentRoot) {
       concurrentRoot ? ConcurrentRoot : LegacyRoot,
       false,
       null,
-      false
+      false,
+      null
     );
     roots.set(containerTag, root);
   }
diff --git a/Libraries/Renderer/implementations/ReactFabric-dev.js b/Libraries/Renderer/implementations/ReactFabric-dev.js
index baf3dffb555..6899cf9d416 100644
--- a/Libraries/Renderer/implementations/ReactFabric-dev.js
+++ b/Libraries/Renderer/implementations/ReactFabric-dev.js
@@ -8,7 +8,7 @@
  * @nolint
  * @providesModule ReactFabric-dev
  * @preventMunge
- * @generated SignedSource<<4d5f2029889b40aa66f49d113efae635>>
+ * @generated SignedSource<<64e2487c0986fc70b80db55f5a1cbb38>>
  */
 
 'use strict';
@@ -5697,7 +5697,7 @@ var Passive$1 =
   /*   */
   4;
 
-var ReactVersion = "17.0.3-459c34fde";
+var ReactVersion = "17.0.3-2d8d133e1";
 
 var ReactCurrentBatchConfig = ReactSharedInternals.ReactCurrentBatchConfig;
 var NoTransition = 0;
diff --git a/Libraries/Renderer/implementations/ReactFabric-prod.fb.js b/Libraries/Renderer/implementations/ReactFabric-prod.fb.js
index c33209be23c..7d8cdbe0a52 100644
--- a/Libraries/Renderer/implementations/ReactFabric-prod.fb.js
+++ b/Libraries/Renderer/implementations/ReactFabric-prod.fb.js
@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<f49e2008d57b20c2e903bfb3247a8247>>
+ * @generated SignedSource<<fa60bbe943550ad6b4198e70879e32ab>>
  */
 
 "use strict";
@@ -7772,7 +7772,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_942 = {
     findFiberByHostInstance: getInstanceFromInstance,
     bundleType: 0,
-    version: "17.0.3-459c34fde",
+    version: "17.0.3-2d8d133e1",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForViewTag: function() {
@@ -7813,7 +7813,7 @@ var internals$jscomp$inline_1180 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "17.0.3-459c34fde"
+  reconcilerVersion: "17.0.3-2d8d133e1"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1181 = __REACT_DEVTOOLS_GLOBAL_HOOK__;
@@ -7868,8 +7868,7 @@ exports.render = function(element, containerTag, callback, concurrentRoot) {
   root ||
     ((root = concurrentRoot ? 1 : 0),
     (concurrentRoot = new FiberRootNode(containerTag, root, !1)),
-    (root = 1 === root ? 33 : 0),
-    (root = createFiber(3, null, null, root)),
+    (root = createFiber(3, null, null, 1 === root ? 1 : 0)),
     (concurrentRoot.current = root),
     (root.stateNode = concurrentRoot),
     (root.memoizedState = { element: null }),
diff --git a/Libraries/Renderer/implementations/ReactFabric-prod.js b/Libraries/Renderer/implementations/ReactFabric-prod.js
index ed94f6dc502..ffd5e16d297 100644
--- a/Libraries/Renderer/implementations/ReactFabric-prod.js
+++ b/Libraries/Renderer/implementations/ReactFabric-prod.js
@@ -8,7 +8,7 @@
  * @nolint
  * @providesModule ReactFabric-prod
  * @preventMunge
- * @generated SignedSource<<367db686e36965fe5af2760ea20d73fd>>
+ * @generated SignedSource<<ae6fe527bd96e6ad3ea1d713d5b1d2d6>>
  */
 
 "use strict";
@@ -7767,7 +7767,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_942 = {
     findFiberByHostInstance: getInstanceFromInstance,
     bundleType: 0,
-    version: "17.0.3-experimental-459c34fde",
+    version: "17.0.3-experimental-2d8d133e1",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForViewTag: function() {
@@ -7808,7 +7808,7 @@ var internals$jscomp$inline_1180 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "17.0.3-experimental-459c34fde"
+  reconcilerVersion: "17.0.3-experimental-2d8d133e1"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1181 = __REACT_DEVTOOLS_GLOBAL_HOOK__;
diff --git a/Libraries/Renderer/implementations/ReactFabric-profiling.fb.js b/Libraries/Renderer/implementations/ReactFabric-profiling.fb.js
index d03e9aa9b98..cbf24e77674 100644
--- a/Libraries/Renderer/implementations/ReactFabric-profiling.fb.js
+++ b/Libraries/Renderer/implementations/ReactFabric-profiling.fb.js
@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<cd5e70fb000e75a265a6e926c958d134>>
+ * @generated SignedSource<<08382e61f6bfa261be904923b08bfce7>>
  */
 
 "use strict";
@@ -7923,7 +7923,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_966 = {
     findFiberByHostInstance: getInstanceFromInstance,
     bundleType: 0,
-    version: "17.0.3-459c34fde",
+    version: "17.0.3-2d8d133e1",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForViewTag: function() {
@@ -7964,7 +7964,7 @@ var internals$jscomp$inline_1208 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "17.0.3-459c34fde"
+  reconcilerVersion: "17.0.3-2d8d133e1"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1209 = __REACT_DEVTOOLS_GLOBAL_HOOK__;
@@ -8019,7 +8019,7 @@ exports.render = function(element, containerTag, callback, concurrentRoot) {
   root ||
     ((root = concurrentRoot ? 1 : 0),
     (concurrentRoot = new FiberRootNode(containerTag, root, !1)),
-    (root = 1 === root ? 33 : 0),
+    (root = 1 === root ? 1 : 0),
     isDevToolsPresent && (root |= 2),
     (root = createFiber(3, null, null, root)),
     (concurrentRoot.current = root),
diff --git a/Libraries/Renderer/implementations/ReactFabric-profiling.js b/Libraries/Renderer/implementations/ReactFabric-profiling.js
index d3bfaaf8c67..ce7c222db6c 100644
--- a/Libraries/Renderer/implementations/ReactFabric-profiling.js
+++ b/Libraries/Renderer/implementations/ReactFabric-profiling.js
@@ -8,7 +8,7 @@
  * @nolint
  * @providesModule ReactFabric-profiling
  * @preventMunge
- * @generated SignedSource<<01e6bb566cff4f04d60b82f05a0002eb>>
+ * @generated SignedSource<<06caca3d95f98101d397316857fe09c9>>
  */
 
 "use strict";
@@ -7918,7 +7918,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_966 = {
     findFiberByHostInstance: getInstanceFromInstance,
     bundleType: 0,
-    version: "17.0.3-experimental-459c34fde",
+    version: "17.0.3-experimental-2d8d133e1",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForViewTag: function() {
@@ -7959,7 +7959,7 @@ var internals$jscomp$inline_1208 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "17.0.3-experimental-459c34fde"
+  reconcilerVersion: "17.0.3-experimental-2d8d133e1"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1209 = __REACT_DEVTOOLS_GLOBAL_HOOK__;
diff --git a/Libraries/Renderer/implementations/ReactNativeRenderer-dev.fb.js b/Libraries/Renderer/implementations/ReactNativeRenderer-dev.fb.js
index c09a7781cfb..42a94f230c3 100644
--- a/Libraries/Renderer/implementations/ReactNativeRenderer-dev.fb.js
+++ b/Libraries/Renderer/implementations/ReactNativeRenderer-dev.fb.js
@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<e8ee98fb6a815d57f54ee6018b4cb75d>>
+ * @generated SignedSource<<2d7090219901967e7d2d5c87aacfd377>>
  */
 
 'use strict';
@@ -6100,7 +6100,7 @@ var Passive$1 =
   /*   */
   4;
 
-var ReactVersion = "17.0.3-459c34fde";
+var ReactVersion = "17.0.3-2d8d133e1";
 
 var ReactCurrentBatchConfig = ReactSharedInternals.ReactCurrentBatchConfig;
 var NoTransition = 0;
@@ -21758,7 +21758,12 @@ function createHostRootFiber(
       }
     }
 
-    {
+    if (
+      // We only use this flag for our repo tests to check both behaviors.
+      // TODO: Flip this flag and rename it something like "forceConcurrentByDefaultForTesting"
+      // Only for internal experiments.
+      concurrentUpdatesByDefaultOverride
+    ) {
       mode |= ConcurrentUpdatesByDefaultMode;
     }
   } else {
@@ -22110,7 +22115,11 @@ function createFiberRoot(
   var root = new FiberRootNode(containerInfo, tag, hydrate);
   // stateNode is any.
 
-  var uninitializedFiber = createHostRootFiber(tag, isStrictMode);
+  var uninitializedFiber = createHostRootFiber(
+    tag,
+    isStrictMode,
+    concurrentUpdatesByDefaultOverride
+  );
   root.current = uninitializedFiber;
   uninitializedFiber.stateNode = root;
 
@@ -22256,7 +22265,8 @@ function createContainer(
     tag,
     hydrate,
     hydrationCallbacks,
-    isStrictMode
+    isStrictMode,
+    concurrentUpdatesByDefaultOverride
   );
 }
 function updateContainer(element, container, parentComponent, callback) {
@@ -23013,7 +23023,7 @@ function render(element, containerTag, callback) {
   if (!root) {
     // TODO (bvaughn): If we decide to keep the wrapper component,
     // We could create a wrapper for containerTag as well to reduce special casing.
-    root = createContainer(containerTag, LegacyRoot, false, null, false);
+    root = createContainer(containerTag, LegacyRoot, false, null, false, null);
     roots.set(containerTag, root);
   }
 
diff --git a/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js b/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js
index d6d9d934724..945ac922f5b 100644
--- a/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js
+++ b/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js
@@ -8,7 +8,7 @@
  * @nolint
  * @providesModule ReactNativeRenderer-dev
  * @preventMunge
- * @generated SignedSource<<93a7bcd84ef774bbe8e0d71e708c68b0>>
+ * @generated SignedSource<<6bb77061f5834486ffcc964f4e8c0fcf>>
  */
 
 'use strict';
@@ -5985,7 +5985,7 @@ var Passive$1 =
   /*   */
   4;
 
-var ReactVersion = "17.0.3-experimental-459c34fde";
+var ReactVersion = "17.0.3-experimental-2d8d133e1";
 
 var ReactCurrentBatchConfig = ReactSharedInternals.ReactCurrentBatchConfig;
 var NoTransition = 0;
diff --git a/Libraries/Renderer/implementations/ReactNativeRenderer-prod.fb.js b/Libraries/Renderer/implementations/ReactNativeRenderer-prod.fb.js
index 0d9060454b4..94c758fce76 100644
--- a/Libraries/Renderer/implementations/ReactNativeRenderer-prod.fb.js
+++ b/Libraries/Renderer/implementations/ReactNativeRenderer-prod.fb.js
@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<9bac6a5fc32d2dfc49f8866d2d328524>>
+ * @generated SignedSource<<b2116bc91a7766778320a4cdc20a0e6e>>
  */
 
 "use strict";
@@ -7990,7 +7990,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_986 = {
     findFiberByHostInstance: getInstanceFromTag,
     bundleType: 0,
-    version: "17.0.3-459c34fde",
+    version: "17.0.3-2d8d133e1",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForViewTag: function() {
@@ -8031,7 +8031,7 @@ var internals$jscomp$inline_1243 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "17.0.3-459c34fde"
+  reconcilerVersion: "17.0.3-2d8d133e1"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1244 = __REACT_DEVTOOLS_GLOBAL_HOOK__;
diff --git a/Libraries/Renderer/implementations/ReactNativeRenderer-prod.js b/Libraries/Renderer/implementations/ReactNativeRenderer-prod.js
index 2c2ddf12cd9..9b0da71618e 100644
--- a/Libraries/Renderer/implementations/ReactNativeRenderer-prod.js
+++ b/Libraries/Renderer/implementations/ReactNativeRenderer-prod.js
@@ -8,7 +8,7 @@
  * @nolint
  * @providesModule ReactNativeRenderer-prod
  * @preventMunge
- * @generated SignedSource<<8293a98371b705e10c4425e65241f52e>>
+ * @generated SignedSource<<8960cfed6037c61be089c6fd4cf802ce>>
  */
 
 "use strict";
@@ -7985,7 +7985,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_986 = {
     findFiberByHostInstance: getInstanceFromTag,
     bundleType: 0,
-    version: "17.0.3-experimental-459c34fde",
+    version: "17.0.3-experimental-2d8d133e1",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForViewTag: function() {
@@ -8026,7 +8026,7 @@ var internals$jscomp$inline_1243 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "17.0.3-experimental-459c34fde"
+  reconcilerVersion: "17.0.3-experimental-2d8d133e1"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1244 = __REACT_DEVTOOLS_GLOBAL_HOOK__;
diff --git a/Libraries/Renderer/implementations/ReactNativeRenderer-profiling.fb.js b/Libraries/Renderer/implementations/ReactNativeRenderer-profiling.fb.js
index cf3f9c6f8c3..04b71971de1 100644
--- a/Libraries/Renderer/implementations/ReactNativeRenderer-profiling.fb.js
+++ b/Libraries/Renderer/implementations/ReactNativeRenderer-profiling.fb.js
@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<45d8a00bc92ed880e66bd2f961b2658a>>
+ * @generated SignedSource<<3b76b5ccdbbb286322dca9906d61c805>>
  */
 
 "use strict";
@@ -8141,7 +8141,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_1010 = {
     findFiberByHostInstance: getInstanceFromTag,
     bundleType: 0,
-    version: "17.0.3-459c34fde",
+    version: "17.0.3-2d8d133e1",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForViewTag: function() {
@@ -8182,7 +8182,7 @@ var internals$jscomp$inline_1271 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "17.0.3-459c34fde"
+  reconcilerVersion: "17.0.3-2d8d133e1"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1272 = __REACT_DEVTOOLS_GLOBAL_HOOK__;
diff --git a/Libraries/Renderer/implementations/ReactNativeRenderer-profiling.js b/Libraries/Renderer/implementations/ReactNativeRenderer-profiling.js
index b63260c5a78..876b06a345a 100644
--- a/Libraries/Renderer/implementations/ReactNativeRenderer-profiling.js
+++ b/Libraries/Renderer/implementations/ReactNativeRenderer-profiling.js
@@ -8,7 +8,7 @@
  * @nolint
  * @providesModule ReactNativeRenderer-profiling
  * @preventMunge
- * @generated SignedSource<<59a5abf160d2c70d015e43f009b98fae>>
+ * @generated SignedSource<<69fba3aae321ae1afa2449c55aef29f5>>
  */
 
 "use strict";
@@ -8136,7 +8136,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_1010 = {
     findFiberByHostInstance: getInstanceFromTag,
     bundleType: 0,
-    version: "17.0.3-experimental-459c34fde",
+    version: "17.0.3-experimental-2d8d133e1",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForViewTag: function() {
@@ -8177,7 +8177,7 @@ var internals$jscomp$inline_1271 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "17.0.3-experimental-459c34fde"
+  reconcilerVersion: "17.0.3-experimental-2d8d133e1"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1272 = __REACT_DEVTOOLS_GLOBAL_HOOK__;