diff --git a/b4.spec b/b4.spec
index 48c9e74..608fbe7 100644
--- a/b4.spec
+++ b/b4.spec
@@ -32,6 +32,7 @@ BuildRequires:  python3-requests
 BuildRequires:  python3-setuptools
 Requires:       python3-dkimpy >= 1.0.5
 Requires:       python3-dnspython >= 2.0.0
+Requires:       python3-patatt >= 0.4
 Requires:       python3-requests >= 2.24.0
 
 %description