diff --git a/Dockerfile b/Dockerfile
index bc4ea0e..e02d9fd 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,7 +9,12 @@ ARG BASE_CUDA_RUN_CONTAINER=nvidia/cuda:${CUDA_VERSION}-runtime-ubuntu${UBUNTU_V
 FROM ${BASE_CUDA_DEV_CONTAINER} as build
 
 ENV DEBIAN_FRONTEND=noninteractive
-RUN apt-get update && \
+# Use kitware's repo to make sure CMake is newer than 3.17.
+RUN wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | \
+        gpg --dearmor - | tee /usr/share/keyrings/kitware-archive-keyring.gpg >/dev/null && \
+    echo 'deb [signed-by=/usr/share/keyrings/kitware-archive-keyring.gpg] https://apt.kitware.com/ubuntu/ focal main' | \
+        tee /etc/apt/sources.list.d/kitware.list >/dev/null && \
+    apt-get update && \
     apt-get install -y --no-install-recommends \
         curl \
         pkg-config \