diff --git a/Dockerfile b/Dockerfile
index 51d6f04..964aca0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 
 # FreeBSD headers and libraries used only as a cross-compilation sysroot.
-FROM rockylinux:10 AS freebsd-sysroot
+FROM rockylinux:9 AS freebsd-sysroot
 ARG FREEBSD_RELEASE=15.1-RELEASE
 ARG FREEBSD_MIRROR=https://download.freebsd.org/releases/amd64/amd64
 RUN dnf -y install --allowerasing ca-certificates coreutils curl tar xz \
@@ -18,7 +18,7 @@ RUN set -eux; \
   mkdir -p /freebsd-sysroot; \
   tar -xJf base.txz -C /freebsd-sysroot ./lib ./usr/include ./usr/lib
 
-FROM rockylinux:10
+FROM rockylinux:9
 
 ARG RUST_TOOLCHAIN=stable
 ARG FREEBSD_RUST_TOOLCHAIN=1.88.0