diff --git a/ftl-build/Dockerfile b/ftl-build/Dockerfile
index a2c5ed7..137621b 100644
--- a/ftl-build/Dockerfile
+++ b/ftl-build/Dockerfile
@@ -40,7 +40,8 @@ RUN apk add --no-cache \
         gdb \
         py3-jinja2 \
         py3-jsonschema \
-        ncurses
+        ncurses \
+        py3-dnspython
 
 ENV STATIC true
 ENV TEST true