diff --git a/Dockerfile b/Dockerfile
index 465aed1..8ae9868 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -121,11 +121,16 @@ RUN apt-get update && apt-get -y upgrade && apt-get -y install --no-install-reco
   && rm -rf /var/lib/apt/lists/* \
   && cpanm \
     # RT dependencies
+    Date::Extract \
+    DBD::SQLite \
     DBIx::SearchBuilder \
+    GD::Graph \
     GnuPG::Interface \
+    GraphViz2 \
     Mozilla::CA \
     Pod::Select \
     # RT extension development dependencies
     Module::Install::RTx \
     Module::Install::Substitute \
+    Test::MockTime::HiRes \
   && rm -rf /root/.cpanm