diff --git a/Dockerfile b/Dockerfile
index 679bc02..c55e780 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,6 +5,10 @@ ARG BUILD_BASE_VERSION=0.5-r3
 RUN --mount=type=cache,sharing=locked,target=/var/cache/apk \
     apk add --update build-base=${BUILD_BASE_VERSION}
 
+ARG CLANG21_LIBS_VERSION=21.1.2-r2
+RUN --mount=type=cache,sharing=locked,target=/var/cache/apk \
+    apk add --update clang21-libs=${CLANG21_LIBS_VERSION}
+
 ARG CMAKE_VERSION=4.1.3-r0
 RUN --mount=type=cache,sharing=locked,target=/var/cache/apk \
     apk add --update cmake=${CMAKE_VERSION}