diff --git a/.ci/Dockerfile b/.ci/Dockerfile
deleted file mode 100644
index 4c323cb8e6..0000000000
--- a/.ci/Dockerfile
+++ /dev/null
@@ -1,9 +0,0 @@
-FROM fedora:35
-
-MAINTAINER Daiki Ueno <dueno@redhat.com>
-
-RUN dnf -y update && \
-    dnf -y install 'dnf-command(builddep)' && \
-    dnf -y builddep golang && \
-    dnf -y install gcc-go openssl-devel && \
-    dnf clean all