diff --git a/backend/pom.xml b/backend/pom.xml
index 33c1483e..5a733e76 100644
--- a/backend/pom.xml
+++ b/backend/pom.xml
@@ -164,12 +164,19 @@
 			<version>3.0.2</version>
 		</dependency>
 
-		<!-- PDF rendering for training data export -->
+		<!-- PDF rendering for training data export and thumbnail generation -->
 		<dependency>
 			<groupId>org.apache.pdfbox</groupId>
 			<artifactId>pdfbox</artifactId>
 			<version>3.0.4</version>
 		</dependency>
+
+		<!-- TIFF decoding plugin for ImageIO (thumbnail generation from scanned TIFFs) -->
+		<dependency>
+			<groupId>com.twelvemonkeys.imageio</groupId>
+			<artifactId>imageio-tiff</artifactId>
+			<version>3.12.0</version>
+		</dependency>
 	</dependencies>