diff --git a/src/cdk/schematics/ng-update/upgrade-rules/index.ts b/src/cdk/schematics/ng-update/upgrade-rules/index.ts
index db5d1e25461a..d53d445435c6 100644
--- a/src/cdk/schematics/ng-update/upgrade-rules/index.ts
+++ b/src/cdk/schematics/ng-update/upgrade-rules/index.ts
@@ -7,6 +7,7 @@
  */
 
 import {Rule, SchematicContext, Tree} from '@angular-devkit/schematics';
+import {NodePackageInstallTask} from '@angular-devkit/schematics/tasks';
 
 import {MigrationRuleType, runMigrationRules} from '../../update-tool';
 import {TargetVersion} from '../../update-tool/target-version';
@@ -79,12 +80,23 @@ export function createUpgradeRule(
     buildPaths.forEach(p => runMigration(p, false));
     testPaths.forEach(p => runMigration(p, true));
 
+    let runPackageManager = false;
+
     // Run the global post migration static members for all migration rules.
-    rules.forEach(r => r.globalPostMigration(tree, context));
+    rules.forEach(rule => {
+      const actionResult = rule.globalPostMigration(tree, context);
+      if (actionResult) {
+        runPackageManager = runPackageManager || actionResult.runPackageManager;
+      }
+    });
 
-    // Execute all asynchronous tasks and await them here. We want to run
-    // the "onMigrationCompleteFn" after all work is done.
-    await context.engine.executePostTasks().toPromise();
+    // If a rule requested the package manager to run, we run it as an
+    // asynchronous post migration task. We cannot run it synchronously,
+    // as file changes from the current migration task are not applied to
+    // the file system yet.
+    if (runPackageManager) {
+      context.addTask(new NodePackageInstallTask({quiet: false}));
+    }
 
     if (onMigrationCompleteFn) {
       onMigrationCompleteFn(targetVersion, hasRuleFailures);
diff --git a/src/cdk/schematics/update-tool/migration-rule.ts b/src/cdk/schematics/update-tool/migration-rule.ts
index 7399354fdbbc..eb397d8cc799 100644
--- a/src/cdk/schematics/update-tool/migration-rule.ts
+++ b/src/cdk/schematics/update-tool/migration-rule.ts
@@ -19,6 +19,11 @@ export interface MigrationFailure {
   position?: LineAndCharacter;
 }
 
+export type PostMigrationAction = void | {
+  /** Whether the package manager should run upon migration completion. */
+  runPackageManager: boolean;
+};
+
 export class MigrationRule<T> {
   /** List of migration failures that need to be reported. */
   failures: MigrationFailure[] = [];
@@ -92,5 +97,5 @@ export class MigrationRule<T> {
    * migration result of all individual targets. e.g. removing HammerJS if it
    * is not needed in any project target.
    */
-  static globalPostMigration(tree: Tree, context: SchematicContext) {}
+  static globalPostMigration(tree: Tree, context: SchematicContext): PostMigrationAction {}
 }
diff --git a/src/material/schematics/ng-update/upgrade-rules/hammer-gestures-v9/hammer-gestures-rule.ts b/src/material/schematics/ng-update/upgrade-rules/hammer-gestures-v9/hammer-gestures-rule.ts
index 89aaf38a5202..d0bbc4829b56 100644
--- a/src/material/schematics/ng-update/upgrade-rules/hammer-gestures-v9/hammer-gestures-rule.ts
+++ b/src/material/schematics/ng-update/upgrade-rules/hammer-gestures-v9/hammer-gestures-rule.ts
@@ -12,12 +12,12 @@ import {
   Path as DevkitPath
 } from '@angular-devkit/core';
 import {SchematicContext, SchematicsException, Tree} from '@angular-devkit/schematics';
-import {NodePackageInstallTask} from '@angular-devkit/schematics/tasks';
 import {
   getProjectIndexFiles,
   getProjectMainFile,
   MigrationFailure,
   MigrationRule,
+  PostMigrationAction,
   ResolvedResource,
   TargetVersion
 } from '@angular/cdk/schematics';
@@ -762,11 +762,11 @@ export class HammerGesturesRule extends MigrationRule<null> {
    * on the analysis of the individual targets. For example: we only remove Hammer
    * from the "package.json" if it is not used in *any* project target.
    */
-  static globalPostMigration(tree: Tree, context: SchematicContext) {
+  static globalPostMigration(tree: Tree, context: SchematicContext): PostMigrationAction {
     if (!this.globalUsesHammer && this._removeHammerFromPackageJson(tree)) {
       // Since Hammer has been removed from the workspace "package.json" file,
       // we schedule a node package install task to refresh the lock file.
-      context.addTask(new NodePackageInstallTask({quiet: false}));
+      return {runPackageManager: true};
     }
 
     context.logger.info(chalk.yellow(