diff --git a/dockerfiles/pld-linux.dockerfile b/dockerfiles/pld-linux.dockerfile
index 8026459..9ee7b9d 100644
--- a/dockerfiles/pld-linux.dockerfile
+++ b/dockerfiles/pld-linux.dockerfile
@@ -21,6 +21,7 @@ RUN \
     make \
     ruby \
     ruby-bundler \
+    ruby-devel \
     ruby-rake \
     sudo \
     which