diff --git a/Dockerfile b/Dockerfile
index 0bfb6b7..ebf839b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,12 +1,12 @@
-FROM alpine:3.20.3 AS builder
+FROM alpine:3.21.0 AS builder
 
 RUN apk add --no-cache \
-	libstdc++=13.2.1_git20240309-r0 \
+	libstdc++=14.2.0-r4 \
 	&& adduser --disabled-password saundersp
 
 RUN apk add --no-cache \
 	make=4.4.1-r2 \
-	g++=13.2.1_git20240309-r0
+	g++=14.2.0-r4
 
 USER saundersp
 
@@ -16,10 +16,10 @@ COPY *.cpp *.hpp Makefile ./
 
 RUN make -j "$(nproc)"
 
-FROM alpine:3.20.3
+FROM alpine:3.21.0
 
 RUN apk add --no-cache \
-	libstdc++=13.2.1_git20240309-r0 \
+	libstdc++=14.2.0-r4 \
 	&& adduser --disabled-password saundersp
 
 USER saundersp