diff --git a/dev-infra/ng-dev.js b/dev-infra/ng-dev.js
index a86d2d3ac3..39e9f71014 100755
--- a/dev-infra/ng-dev.js
+++ b/dev-infra/ng-dev.js
@@ -5807,6 +5807,8 @@ class ReleaseAction {
             // so we cannot build and publish it.
             yield invokeYarnInstallCommand(this.projectDir);
             const builtPackages = yield invokeReleaseBuildCommand();
+            // Verify the packages built are the correct version.
+            yield this._verifyPackageVersions(newVersion, builtPackages);
             // Create a Github release for the new version.
             yield this._createGithubReleaseForVersion(newVersion, versionBumpCommitSha);
             // Walk through all built packages and publish them to NPM.
@@ -5841,6 +5843,20 @@ class ReleaseAction {
             return data.commit.message.startsWith(getCommitMessageForRelease(version));
         });
     }
+    /** Verify the version of each generated package exact matches the specified version. */
+    _verifyPackageVersions(version, packages) {
+        return tslib.__awaiter(this, void 0, void 0, function* () {
+            for (const pkg of packages) {
+                const { version: packageJsonVersion } = JSON.parse(yield fs.promises.readFile(path.join(pkg.outputPath, 'package.json'), 'utf8'));
+                if (version.compare(packageJsonVersion) !== 0) {
+                    error(red('The built package version does not match the version being released.'));
+                    error(`  Release Version:   ${version.version}`);
+                    error(`  Generated Version: ${packageJsonVersion}`);
+                    throw new FatalReleaseActionError();
+                }
+            }
+        });
+    }
 }
 
 /**
diff --git a/dev-infra/release/publish/actions.ts b/dev-infra/release/publish/actions.ts
index b2e4e5edc8..3b22e81feb 100644
--- a/dev-infra/release/publish/actions.ts
+++ b/dev-infra/release/publish/actions.ts
@@ -503,6 +503,9 @@ export abstract class ReleaseAction {
     await invokeYarnInstallCommand(this.projectDir);
     const builtPackages = await invokeReleaseBuildCommand();
 
+    // Verify the packages built are the correct version.
+    await this._verifyPackageVersions(newVersion, builtPackages);
+
     // Create a Github release for the new version.
     await this._createGithubReleaseForVersion(newVersion, versionBumpCommitSha);
 
@@ -537,4 +540,18 @@ export abstract class ReleaseAction {
         await this.git.github.repos.getCommit({...this.git.remoteParams, ref: commitSha});
     return data.commit.message.startsWith(getCommitMessageForRelease(version));
   }
+
+  /** Verify the version of each generated package exact matches the specified version. */
+  private async _verifyPackageVersions(version: semver.SemVer, packages: BuiltPackage[]) {
+    for (const pkg of packages) {
+      const {version: packageJsonVersion} =
+          JSON.parse(await fs.readFile(join(pkg.outputPath, 'package.json'), 'utf8'));
+      if (version.compare(packageJsonVersion) !== 0) {
+        error(red('The built package version does not match the version being released.'));
+        error(`  Release Version:   ${version.version}`);
+        error(`  Generated Version: ${packageJsonVersion}`);
+        throw new FatalReleaseActionError();
+      }
+    }
+  }
 }
diff --git a/dev-infra/release/publish/test/test-utils.ts b/dev-infra/release/publish/test/test-utils.ts
index 0f4ac54445..8225a30980 100644
--- a/dev-infra/release/publish/test/test-utils.ts
+++ b/dev-infra/release/publish/test/test-utils.ts
@@ -89,7 +89,7 @@ export function setupReleaseActionForTesting<T extends ReleaseAction>(
   spyOn(console, 'promptConfirm').and.resolveTo(true);
 
   // Fake all external commands for the release tool.
-  spyOn(npm, 'runNpmPublish').and.resolveTo(true);
+  spyOn(npm, 'runNpmPublish').and.resolveTo();
   spyOn(externalCommands, 'invokeSetNpmDistCommand').and.resolveTo();
   spyOn(externalCommands, 'invokeYarnInstallCommand').and.resolveTo();
   spyOn(externalCommands, 'invokeReleaseBuildCommand').and.resolveTo([
@@ -97,6 +97,10 @@ export function setupReleaseActionForTesting<T extends ReleaseAction>(
     {name: '@angular/pkg2', outputPath: `${testTmpDir}/dist/pkg2`}
   ]);
 
+  // Fake checking the package versions since we don't actually create packages to check against in
+  // the publish tests.
+  spyOn(ReleaseAction.prototype, '_verifyPackageVersions' as any).and.resolveTo();
+
   // Create an empty changelog and a `package.json` file so that file system
   // interactions with the project directory do not cause exceptions.
   writeFileSync(join(testTmpDir, 'CHANGELOG.md'), 'Existing changelog');