diff --git a/minecraft/Dockerfile b/minecraft/Dockerfile
index 92979cd..0268651 100644
--- a/minecraft/Dockerfile
+++ b/minecraft/Dockerfile
@@ -10,8 +10,8 @@ WORKDIR /home/ubuntu
 RUN wget -O rcon-cli.tar.gz https://github.com/itzg/rcon-cli/releases/download/1.6.9/rcon-cli_1.6.9_linux_amd64.tar.gz
 RUN tar xvf rcon-cli.tar.gz && rm rcon-cli.tar.gz
 
-# from https://www.minecraft.net/en-us/download/server (currently 1.21.2)
-RUN wget https://piston-data.mojang.com/v1/objects/7bf95409b0d9b5388bfea3704ec92012d273c14c/server.jar
+# from https://www.minecraft.net/en-us/download/server (currently 1.21.4)
+RUN wget https://piston-data.mojang.com/v1/objects/4707d00eb834b446575d89a61a11b5d548d8c001/server.jar
 
 COPY --chown=ubuntu:ubuntu eula.txt ./
 COPY --chown=ubuntu:ubuntu entry.sh ./