diff --git a/.circleci/config.yml b/.circleci/config.yml
index c413bae823ceb..b5f7604059020 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -168,11 +168,7 @@ jobs:
       - checkout
       - run: yarn workspaces info | head -n -1 > workspace_info.txt
       - *restore_node_modules
-      - run:
-          command: |
-            ./scripts/circleci/add_build_info_json.sh
-            ./scripts/circleci/update_package_versions.sh
-            yarn build-combined
+      - run: yarn build-combined
       - persist_to_workspace:
           root: build2
           paths:
diff --git a/scripts/rollup/build-all-release-channels.js b/scripts/rollup/build-all-release-channels.js
index 774f1011aa287..0b74e4c42d8e9 100644
--- a/scripts/rollup/build-all-release-channels.js
+++ b/scripts/rollup/build-all-release-channels.js
@@ -4,11 +4,18 @@
 
 const fs = require('fs');
 const {spawnSync} = require('child_process');
+const path = require('path');
 const tmp = require('tmp');
 
 // Runs the build script for both stable and experimental release channels,
 // by configuring an environment variable.
 
+const sha = (
+  spawnSync('git', ['show', '-s', '--format=%h']).stdout + ''
+).trim();
+const ReactVersion = JSON.parse(fs.readFileSync('packages/react/package.json'))
+  .version;
+
 if (process.env.CIRCLE_NODE_TOTAL) {
   // In CI, we use multiple concurrent processes. Allocate half the processes to
   // build the stable channel, and the other half for experimental. Override
@@ -19,13 +26,19 @@ if (process.env.CIRCLE_NODE_TOTAL) {
   if (index < halfTotal) {
     const nodeTotal = halfTotal;
     const nodeIndex = index;
+    const version = '0.0.0-' + sha;
+    updateTheReactVersionThatDevToolsReads(ReactVersion + '-' + sha);
     buildForChannel('stable', nodeTotal, nodeIndex);
-    processStable('./build');
+    processStable('./build', version);
   } else {
     const nodeTotal = total - halfTotal;
     const nodeIndex = index - halfTotal;
+    const version = '0.0.0-experimental-' + sha;
+    updateTheReactVersionThatDevToolsReads(
+      ReactVersion + '-experimental-' + sha
+    );
     buildForChannel('experimental', nodeTotal, nodeIndex);
-    processExperimental('./build');
+    processExperimental('./build', version);
   }
 
   // TODO: Currently storing artifacts as `./build2` so that it doesn't conflict
@@ -34,15 +47,17 @@ if (process.env.CIRCLE_NODE_TOTAL) {
 } else {
   // Running locally, no concurrency. Move each channel's build artifacts into
   // a temporary directory so that they don't conflict.
+  const stableVersion = '0.0.0-' + sha;
   buildForChannel('stable', '', '');
   const stableDir = tmp.dirSync().name;
   fs.renameSync('./build', stableDir);
-  processStable(stableDir);
+  processStable(stableDir, stableVersion);
 
+  const experimentalVersion = '0.0.0-experimental-' + sha;
   buildForChannel('experimental', '', '');
   const experimentalDir = tmp.dirSync().name;
   fs.renameSync('./build', experimentalDir);
-  processExperimental(experimentalDir);
+  processExperimental(experimentalDir, experimentalVersion);
 
   // Then merge the experimental folder into the stable one. processExperimental
   // will have already removed conflicting files.
@@ -68,8 +83,9 @@ function buildForChannel(channel, nodeTotal, nodeIndex) {
   });
 }
 
-function processStable(buildDir) {
+function processStable(buildDir, version) {
   if (fs.existsSync(buildDir + '/node_modules')) {
+    updatePackageVersions(buildDir + '/node_modules', version);
     fs.renameSync(buildDir + '/node_modules', buildDir + '/oss-stable');
   }
 
@@ -88,8 +104,9 @@ function processStable(buildDir) {
   }
 }
 
-function processExperimental(buildDir) {
+function processExperimental(buildDir, version) {
   if (fs.existsSync(buildDir + '/node_modules')) {
+    updatePackageVersions(buildDir + '/node_modules', version);
     fs.renameSync(buildDir + '/node_modules', buildDir + '/oss-experimental');
   }
 
@@ -121,3 +138,46 @@ function processExperimental(buildDir) {
     }
   }
 }
+
+function updatePackageVersions(modulesDir, version) {
+  const allReactModuleNames = fs.readdirSync('packages');
+  for (const moduleName of fs.readdirSync(modulesDir)) {
+    const packageJSONPath = path.join(modulesDir, moduleName, 'package.json');
+    const stats = fs.statSync(packageJSONPath);
+    if (stats.isFile()) {
+      const packageInfo = JSON.parse(fs.readFileSync(packageJSONPath));
+
+      // Update version
+      packageInfo.version = version;
+
+      // Update dependency versions
+      if (packageInfo.dependencies) {
+        for (const dep of Object.keys(packageInfo.dependencies)) {
+          if (allReactModuleNames.includes(dep)) {
+            packageInfo.dependencies[dep] = version;
+          }
+        }
+      }
+      if (packageInfo.peerDependencies) {
+        for (const dep of Object.keys(packageInfo.peerDependencies)) {
+          if (allReactModuleNames.includes(dep)) {
+            packageInfo.peerDependencies[dep] = version;
+          }
+        }
+      }
+
+      // Write out updated package.json
+      fs.writeFileSync(packageJSONPath, JSON.stringify(packageInfo, null, 2));
+    }
+  }
+}
+
+function updateTheReactVersionThatDevToolsReads(version) {
+  // Overwrite the ReactVersion module before the build script runs so that it
+  // is included in the final bundles. This only runs in CI, so it's fine to
+  // edit the source file.
+  fs.writeFileSync(
+    './packages/shared/ReactVersion.js',
+    `export default '${version}';\n`
+  );
+}