diff --git a/containers/forgejo-runner/Dockerfile b/containers/forgejo-runner/Dockerfile
index 9b71814..a05e931 100644
--- a/containers/forgejo-runner/Dockerfile
+++ b/containers/forgejo-runner/Dockerfile
@@ -35,7 +35,7 @@ RUN install -m 0755 -d /etc/apt/keyrings \
     && chmod a+r /etc/apt/keyrings/docker.asc \
     && echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian $(lsb_release -cs) stable" > /etc/apt/sources.list.d/docker.list \
     && apt-get update \
-    && apt-get install -y --no-install-recommends docker-ce-cli skopeo \
+    && apt-get install -y --no-install-recommends docker-ce-cli docker-buildx-plugin skopeo \
     && rm -rf /var/lib/apt/lists/*
 
 # Install uv (Python package runner for towncrier)
diff --git a/docs/changelog.d/fix-docker-buildx-runner.infra.md b/docs/changelog.d/fix-docker-buildx-runner.infra.md
new file mode 100644
index 0000000..b811911
--- /dev/null
+++ b/docs/changelog.d/fix-docker-buildx-runner.infra.md
@@ -0,0 +1 @@
+Install `docker-buildx-plugin` in forgejo-runner image to support `docker buildx build`.