diff --git a/Dockerfile b/Dockerfile
index f6595fc0..635f4722 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -36,7 +36,7 @@ FROM base AS build
 # Install packages needed to build gems
 RUN set -eux; \
     apt-get update -qq ; \
-    apt-get install --no-install-recommends -y build-essential git libpq-dev pkg-config ; \
+    apt-get install --no-install-recommends -y build-essential git libpq-dev pkg-config libyaml-dev ; \
     rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
 # Install application gems