diff --git a/docker/Dockerfile b/docker/Dockerfile
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -23,6 +23,7 @@
     nodejs \
     yarn && \
   apt-get install -y --no-install-recommends \
+    opam \
     r-base-core \
     r-cran-jsonlite && \
   apt-get clean && \