diff --git a/Dockerfile b/Dockerfile
index e9150da..630badf 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -47,6 +47,9 @@ COPY app/config/runtime.exs config/
 
 RUN mix compile
 
+# Install npm dependencies for JS assets
+RUN cd assets && npm install
+
 # Build assets after compile (phoenix-colocated hooks need compiled app)
 RUN mix assets.deploy