diff --git a/docker/torch1.9.0-cuda10.2.dockerfile b/docker/torch1.9.0-cuda10.2.dockerfile
index b6d446139..d705a6c5f 100644
--- a/docker/torch1.9.0-cuda10.2.dockerfile
+++ b/docker/torch1.9.0-cuda10.2.dockerfile
@@ -13,6 +13,11 @@ LABEL k2_version=${K2_VERSION}
 LABEL kaldifeat_version=${KALDIFEAT_VERSION}
 LABEL github_repo="https://github.com/k2-fsa/icefall"
 
+# see https://developer.nvidia.com/blog/updating-the-cuda-linux-gpg-repository-key/
+
+RUN sudo apt-key del 7fa2af80 && \
+    curl -fsSL https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/x86_64/cuda-keyring_1.0-1_all.deb |  dpkg -i -
+
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
         curl \