diff --git a/klausur-service/backend/requirements.txt b/klausur-service/backend/requirements.txt
index 92d063a..bc2511f 100644
--- a/klausur-service/backend/requirements.txt
+++ b/klausur-service/backend/requirements.txt
@@ -32,6 +32,9 @@ Pillow>=10.0.0
 rapidocr
 onnxruntime
 
+# IPA pronunciation dictionary lookup (MIT license, bundled CMU dict ~134k words)
+eng-to-ipa
+
 # PostgreSQL (for metrics storage)
 psycopg2-binary>=2.9.0
 asyncpg>=0.29.0