diff --git a/.ci/image/Dockerfile b/.ci/image/Dockerfile
index 7ab9c0c..f115929 100644
--- a/.ci/image/Dockerfile
+++ b/.ci/image/Dockerfile
@@ -37,6 +37,7 @@ RUN set -eux; \
     apt-get update; \
     apt-get install --no-install-recommends -y \
         build-essential \
+        cmake \
         curl \
         git \
         gpg \