diff --git a/.changeset/dull-ducks-shake.md b/.changeset/dull-ducks-shake.md
new file mode 100644
index 0000000000..ed56fb732a
--- /dev/null
+++ b/.changeset/dull-ducks-shake.md
@@ -0,0 +1,5 @@
+---
+'@directus/api': patch
+---
+
+Fixed filename_disk extension not getting updated when replacing an image with another file extension 
diff --git a/api/src/services/files.test.ts b/api/src/services/files.test.ts
index 5906b72bac..b491218201 100644
--- a/api/src/services/files.test.ts
+++ b/api/src/services/files.test.ts
@@ -149,6 +149,56 @@ describe('Integration Tests', () => {
 					{ emitEvents: false },
 				);
 			});
+
+			it('should update the `filename_disk` extension to the correct mimetype', async () => {
+				tracker.on
+					.select(
+						'select "folder", "filename_download", "filename_disk", "title", "description", "metadata" from "directus_files" where "id" = ?',
+					)
+					.response(null);
+
+				const mockDataJPG = {
+					storage: 'local',
+					type: 'image/jpeg',
+					filename_download: 'test.jpg',
+				};
+
+				const mockDataPNG = {
+					storage: 'local',
+					type: 'image/png',
+					filename_download: 'test.png',
+				};
+
+				const mockDate = new Date();
+
+				vi.setSystemTime(mockDate);
+
+				await service.uploadOne(new PassThrough(), mockDataJPG);
+
+				expect(superUpdateOne).toHaveBeenCalledWith(
+					sample.id,
+					expect.objectContaining({
+						...mockDataJPG,
+						uploaded_on: mockDate.toISOString(),
+						filename_disk: `${sample.id}.jpg`,
+					}),
+					{ emitEvents: false },
+				);
+
+				await service.uploadOne(new PassThrough(), mockDataPNG);
+
+				expect(superUpdateOne).toHaveBeenCalledWith(
+					sample.id,
+					expect.objectContaining({
+						...mockDataPNG,
+						uploaded_on: mockDate.toISOString(),
+						filename_disk: `${sample.id}.png`,
+					}),
+					{ emitEvents: false },
+				);
+
+				vi.useRealTimers();
+			});
 		});
 	});
 });
diff --git a/api/src/services/files.ts b/api/src/services/files.ts
index d9853a74fc..a220c857be 100644
--- a/api/src/services/files.ts
+++ b/api/src/services/files.ts
@@ -81,6 +81,11 @@ export class FilesService extends ItemsService<File> {
 		// The filename_disk is the FINAL filename on disk
 		payload.filename_disk ||= primaryKey + (fileExtension || '');
 
+		// If the filename_disk extension doesn't match the new mimetype, update it
+		if (isReplacement === true && path.extname(payload.filename_disk!) !== fileExtension) {
+			payload.filename_disk = primaryKey + (fileExtension || '');
+		}
+
 		// Temp filename is used for replacements
 		const tempFilenameDisk = 'temp_' + payload.filename_disk;