diff --git a/README.md b/README.md
index 5561330f06ffaaa72fb1681553b8dad832bdb622..c40ad6d913ae6ea091451a71c06fdfd05a9c7b57 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,8 @@ SPDX-License-Identifier: CC0-1.0
     - Python > 3.8
     - Docker > 20.10
     - Docker Compose > 1.25
+    - libicu-dev
+
 1. Create/activate virtual environment (ensure you use the correct python version!).
 
     ```sh