diff --git a/backend/pom.xml b/backend/pom.xml
index 75533f3e..d759d8e3 100644
--- a/backend/pom.xml
+++ b/backend/pom.xml
@@ -34,6 +34,12 @@
         <artifactId>flyway-core</artifactId>
         <version>9.22.3</version>
       </dependency>
+      <dependency>
+        <!-- temporarily pin Flyway version until Quarkus LTS contains Flyway >= 9.21.0; see https://github.com/cryptomator/hub/issues/256 -->
+        <groupId>io.quarkus</groupId>
+        <artifactId>quarkus-flyway</artifactId>
+        <version>3.3.0</version>
+      </dependency>
     </dependencies>
   </dependencyManagement>