diff --git a/appinfo/routes.php b/appinfo/routes.php
index c98468f3..782d0e03 100644
--- a/appinfo/routes.php
+++ b/appinfo/routes.php
@@ -41,6 +41,7 @@ return [
 		//Revisions
 		['name' => 'credential#getRevision', 'url' => '/api/v2/credentials/{credential_id}/revision', 'verb' => 'GET'],
 		['name' => 'credential#deleteRevision', 'url' => '/api/v2/credentials/{credential_id}/revision/{revision_id}', 'verb' => 'DELETE'],
+		['name' => 'credential#updateRevision', 'url' => '/api/v2/credentials/{credential_id}/revision/{revision_id}', 'verb' => 'PATCH'],
 
 		//File stuff
 		['name' => 'file#uploadFile', 'url' => '/api/v2/file', 'verb' => 'POST'],
diff --git a/controller/credentialcontroller.php b/controller/credentialcontroller.php
index 397b3793..24e6ed08 100644
--- a/controller/credentialcontroller.php
+++ b/controller/credentialcontroller.php
@@ -13,6 +13,7 @@ namespace OCA\Passman\Controller;
 
 use OCA\Files_External\NotFoundException;
 use OCA\Passman\Db\SharingACL;
+use OCP\AppFramework\Db\DoesNotExistException;
 use OCP\AppFramework\Http;
 use OCP\AppFramework\Http\DataResponse;
 use OCP\IRequest;
@@ -256,4 +257,19 @@ class CredentialController extends ApiController {
 		$result = $this->credentialRevisionService->deleteRevision($revision_id, $this->userId);
 		return new JSONResponse($result);
 	}
+
+	/**
+	 * @NoAdminRequired
+	 */
+	public function updateRevision($credential_id, $revision_id, $credential_data){
+		$revision = null;
+		try{
+			$revision = $this->credentialRevisionService->getRevision($revision_id);
+		} catch(DoesNotExistException $exception){
+			return new NotFoundResponse();
+		}
+
+		$revision->setCredentialData($credential_data);
+		$this->credentialRevisionService->updateRevision($revision);
+	}
 }
\ No newline at end of file
diff --git a/lib/Db/CredentialRevisionMapper.php b/lib/Db/CredentialRevisionMapper.php
index 578d8100..cf2177b6 100644
--- a/lib/Db/CredentialRevisionMapper.php
+++ b/lib/Db/CredentialRevisionMapper.php
@@ -38,6 +38,22 @@ class CredentialRevisionMapper extends Mapper {
 		return $this->findEntities($sql, $params);
 	}
 
+	/**
+	 * @throws \OCP\AppFramework\Db\DoesNotExistException if not found
+	 * @throws \OCP\AppFramework\Db\MultipleObjectsReturnedException if more than one result
+	 * @return CredentialRevision
+	 */
+	public function getRevision($revision_id, $user_id = null) {
+		$sql = 'SELECT * FROM `*PREFIX*passman_revisions` ' .
+			'WHERE `id` = ?';
+        $params = [$revision_id];
+        if ($user_id !== null) {
+            $sql.= ' and `user_id` = ? ';
+            $params[] = $user_id;
+        }
+		return $this->findEntity($sql, $params);
+	}
+
 	public function create($credential, $userId, $credential_id, $edited_by) {
 		$revision = new CredentialRevision();
 		$revision->setGuid($this->utils->GUID());
diff --git a/lib/Service/CredentialRevisionService.php b/lib/Service/CredentialRevisionService.php
index b15eed76..57004417 100644
--- a/lib/Service/CredentialRevisionService.php
+++ b/lib/Service/CredentialRevisionService.php
@@ -11,6 +11,7 @@
 
 namespace OCA\Passman\Service;
 
+use OCA\Passman\Db\CredentialRevision;
 use OCP\IConfig;
 use OCP\AppFramework\Db\DoesNotExistException;
 
@@ -33,7 +34,15 @@ class CredentialRevisionService {
 		return $this->credentialRevisionMapper->getRevisions($credential_id, $user_id);
 	}
 
+	public function getRevision($credential_id, $user_id = null){
+		return $this->credentialRevisionMapper->getRevision($credential_id, $user_id);
+	}
+
 	public function deleteRevision($revision_id, $user_id){
 		return $this->credentialRevisionMapper->deleteRevision($revision_id, $user_id);
 	}
+
+	public function updateRevision(CredentialRevision $credentialRevision){
+		return $this->credentialRevisionMapper->update($credentialRevision);
+	}
 }
\ No newline at end of file