diff --git a/docker/llpc-clang-tidy.Dockerfile b/docker/llpc-clang-tidy.Dockerfile
index 99f10f0dd2..a5aaad71b2 100644
--- a/docker/llpc-clang-tidy.Dockerfile
+++ b/docker/llpc-clang-tidy.Dockerfile
@@ -31,6 +31,8 @@ SHELL ["/bin/bash", "-c"]
 
 COPY docker/update-llpc.sh /vulkandriver/
 
+RUN apt-get install -yqq --no-install-recommends python3-ruamel.yaml
+
 RUN /vulkandriver/update-llpc.sh
 RUN git -C /vulkandriver/drivers/llpc fetch origin "$LLPC_BASE_REF" --update-head-ok