diff --git a/src/controllers/ScanController.ts b/src/controllers/ScanController.ts
index 259727c..6674f36 100644
--- a/src/controllers/ScanController.ts
+++ b/src/controllers/ScanController.ts
@@ -1,8 +1,10 @@
-import { Authorized, Body, Delete, Get, JsonController, OnUndefined, Param, Post, QueryParam } from 'routing-controllers';
+import { Authorized, Body, Delete, Get, JsonController, OnUndefined, Param, Post, Put, QueryParam } from 'routing-controllers';
 import { OpenAPI, ResponseSchema } from 'routing-controllers-openapi';
 import { getConnectionManager, Repository } from 'typeorm';
-import { ScanNotFoundError } from '../errors/ScanErrors';
+import { RunnerNotFoundError } from '../errors/RunnerErrors';
+import { ScanIdsNotMatchingError, ScanNotFoundError } from '../errors/ScanErrors';
 import { CreateScan } from '../models/actions/CreateScan';
+import { UpdateScan } from '../models/actions/UpdateScan';
 import { Scan } from '../models/entities/Scan';
 import { ResponseEmpty } from '../models/responses/ResponseEmpty';
 import { ResponseScan } from '../models/responses/ResponseScan';
@@ -57,26 +59,27 @@ export class ScanController {
 		return (await this.scanRepository.findOne({ id: scan.id }, { relations: ['runner'] })).toResponse();
 	}
 
-	// @Put('/:id')
-	// @Authorized("DONOR:UPDATE")
-	// @ResponseSchema(ResponseDonor)
-	// @ResponseSchema(DonorNotFoundError, { statusCode: 404 })
-	// @ResponseSchema(DonorIdsNotMatchingError, { statusCode: 406 })
-	// @OpenAPI({ description: "Update the runner whose id you provided. <br> Please remember that ids can't be changed." })
-	// async put(@Param('id') id: number, @Body({ validate: true }) donor: UpdateDonor) {
-	// 	let oldDonor = await this.donorRepository.findOne({ id: id });
+	@Put('/:id')
+	@Authorized("SCAN:UPDATE")
+	@ResponseSchema(ResponseScan)
+	@ResponseSchema(ScanNotFoundError, { statusCode: 404 })
+	@ResponseSchema(RunnerNotFoundError, { statusCode: 404 })
+	@ResponseSchema(ScanIdsNotMatchingError, { statusCode: 406 })
+	@OpenAPI({ description: "Update the runner whose id you provided. <br> Please remember that ids can't be changed." })
+	async put(@Param('id') id: number, @Body({ validate: true }) scan: UpdateScan) {
+		let oldScan = await this.scanRepository.findOne({ id: id });
 
-	// 	if (!oldDonor) {
-	// 		throw new DonorNotFoundError();
-	// 	}
+		if (!oldScan) {
+			throw new ScanNotFoundError();
+		}
 
-	// 	if (oldDonor.id != donor.id) {
-	// 		throw new DonorIdsNotMatchingError();
-	// 	}
+		if (oldScan.id != scan.id) {
+			throw new ScanIdsNotMatchingError();
+		}
 
-	// 	await this.donorRepository.save(await donor.updateDonor(oldDonor));
-	// 	return new ResponseDonor(await this.donorRepository.findOne({ id: id }));
-	// }
+		await this.scanRepository.save(await scan.updateScan(oldScan));
+		return (await this.scanRepository.findOne({ id: id }, { relations: ['runner'] })).toResponse();
+	}
 
 	@Delete('/:id')
 	@Authorized("SCAN:DELETE")
diff --git a/src/models/actions/UpdateScan.ts b/src/models/actions/UpdateScan.ts
new file mode 100644
index 0000000..a51ccea
--- /dev/null
+++ b/src/models/actions/UpdateScan.ts
@@ -0,0 +1,59 @@
+import { IsBoolean, IsInt, IsOptional, IsPositive } from 'class-validator';
+import { getConnection } from 'typeorm';
+import { RunnerNotFoundError } from '../../errors/RunnerErrors';
+import { Runner } from '../entities/Runner';
+import { Scan } from '../entities/Scan';
+
+/**
+ * This classed is used to create a new Scan entity from a json body (post request).
+ */
+export abstract class UpdateScan {
+    /**
+     * The updated scan's id.
+     * This shouldn't have changed but it is here in case anyone ever wants to enable id changes (whyever they would want to).
+     */
+    @IsInt()
+    id: number;
+
+    /**
+     * The updated scan's associated runner.
+     * This is important to link ran distances to runners.
+     */
+    @IsInt()
+    @IsPositive()
+    runner: number;
+
+    /**
+     * Is the updated scan valid (for fraud reasons).
+     */
+    @IsBoolean()
+    @IsOptional()
+    valid?: boolean = true;
+
+    /**
+     * The updated scan's distance in meters.
+     */
+    @IsInt()
+    @IsPositive()
+    public distance: number;
+
+    /**
+     * Update a Scan entity based on this.
+     * @param scan The scan that shall be updated.
+     */
+    public async updateScan(scan: Scan): Promise<Scan> {
+        scan.distance = this.distance;
+        scan.valid = this.valid;
+        scan.runner = await this.getRunner();
+
+        return scan;
+    }
+
+    public async getRunner(): Promise<Runner> {
+        const runner = await getConnection().getRepository(Runner).findOne({ id: this.runner });
+        if (!runner) {
+            throw new RunnerNotFoundError();
+        }
+        return runner;
+    }
+}
\ No newline at end of file