diff --git a/packages/devkit/src/generators/format-files.ts b/packages/devkit/src/generators/format-files.ts
index f4c32d826195d..55b0fd642d933 100644
--- a/packages/devkit/src/generators/format-files.ts
+++ b/packages/devkit/src/generators/format-files.ts
@@ -55,7 +55,10 @@ export async function formatFiles(tree: Tree): Promise<void> {
 
         tree.write(
           file.path,
-          prettier.format(file.content.toString('utf-8'), options)
+          // In prettier v3 the format result is a promise
+          await (prettier.format(file.content.toString('utf-8'), options) as
+            | Promise<string>
+            | string)
         );
       } catch (e) {
         console.warn(`Could not format ${file.path}. Error: "${e.message}"`);
diff --git a/packages/nx/src/generators/internal-utils/format-changed-files-with-prettier-if-available.ts b/packages/nx/src/generators/internal-utils/format-changed-files-with-prettier-if-available.ts
index 53e0013be524b..3914ec1588786 100644
--- a/packages/nx/src/generators/internal-utils/format-changed-files-with-prettier-if-available.ts
+++ b/packages/nx/src/generators/internal-utils/format-changed-files-with-prettier-if-available.ts
@@ -45,7 +45,10 @@ export async function formatChangedFilesWithPrettierIfAvailable(
 
         tree.write(
           file.path,
-          prettier.format(file.content.toString('utf-8'), options)
+          // In prettier v3 the format result is a promise
+          await (prettier.format(file.content.toString('utf-8'), options) as
+            | Promise<string>
+            | string)
         );
       } catch (e) {
         console.warn(`Could not format ${file.path}. Error: "${e.message}"`);
diff --git a/packages/workspace/src/utils/rules/format-files.ts b/packages/workspace/src/utils/rules/format-files.ts
index 2304b3b73a466..cac8cf4401700 100644
--- a/packages/workspace/src/utils/rules/format-files.ts
+++ b/packages/workspace/src/utils/rules/format-files.ts
@@ -63,7 +63,13 @@ export function formatFiles(
         }
 
         try {
-          host.overwrite(file.path, prettier.format(file.content, options));
+          host.overwrite(
+            file.path,
+            // In prettier v3 the format result is a promise
+            await (prettier.format(file.content, options) as
+              | Promise<string>
+              | string)
+          );
         } catch (e) {
           context.logger.warn(
             `Could not format ${file.path} because ${e.message}`