diff --git a/requirements.txt b/requirements.txt
index 3d17f35..5d078c2 100755
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@ bitarray>=0.8.1
 Twisted>=16.3.0
 dmr_utils3>=0.1.19
 configparser>=3.0.0
+aprslib>=0.6.42