diff --git a/Dockerfile b/Dockerfile
index bf58677..e546b4e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,7 +7,7 @@ RUN apk add --no-cache --update openssl \
   && echo hosts: files dns > /etc/nsswitch.conf
 
 # Download Nix and install it into the system.
-ARG NIX_VERSION=2.3.11
+ARG NIX_VERSION=2.3.12
 RUN wget https://nixos.org/releases/nix/nix-${NIX_VERSION}/nix-${NIX_VERSION}-$(uname -m)-linux.tar.xz \
   && tar xf nix-${NIX_VERSION}-$(uname -m)-linux.tar.xz \
   && addgroup -g 30000 -S nixbld \