diff --git a/Dockerfile b/Dockerfile
index af98393..f19c5f1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -43,7 +43,7 @@ FROM base
 
 # Install packages needed for deployment
 RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y curl libsqlite3-0 libvips && \
+    apt-get install --no-install-recommends -y curl libsqlite3-0 libvips libjemalloc2 && \
     rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
 # Copy built artifacts: gems, application
@@ -55,6 +55,8 @@ RUN useradd rails --create-home --shell /bin/bash && \
     chown -R rails:rails db log storage tmp
 USER rails:rails
 
+ENV LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libjemalloc.so.2
+
 # Entrypoint prepares the database.
 ENTRYPOINT ["/rails/bin/docker-entrypoint"]