diff --git a/Dockerfile b/Dockerfile
index 6d52988..1d5c714 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,9 +1,9 @@
-FROM alpine:3.20
+FROM alpine:3.21
 COPY . .
 RUN apk add --no-cache gcc musl-dev && \
   gcc -shared -fPIC -Wall -Wextra -Werror numcpu_override.c -o numcpu_override.so -ldl
 
-FROM alpine:3.20
+FROM alpine:3.21
 COPY /copy.sh /
 COPY --from=0 numcpu_override.so /
 ENTRYPOINT ["/copy.sh"]