diff --git a/shells/objectgericht-project.nix b/shells/objectgericht-project.nix
index e1049269..35e52201 100644
--- a/shells/objectgericht-project.nix
+++ b/shells/objectgericht-project.nix
@@ -4,7 +4,7 @@
     openssl
     maven
     (openjdk17.override { enableJavaFX = true; })
-    (python3.withPackages (ps: [ ps.pyyaml ps.beautifulsoup4 ]))
+    (python3.withPackages (ps: [ ps.pyyaml ps.beautifulsoup4 ps.notmuch ]))
   ];
   commands = [
     {