diff --git a/Dockerfile b/Dockerfile
index a2749e9..0e13bd0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,8 @@
 # https://whitfin.io/speeding-up-rust-docker-builds/
 # TODO: https://stackoverflow.com/questions/57389547/how-to-define-the-context-for-a-docker-build-as-a-specific-commit-on-one-of-the
 
-# 1.47 slim-buster
-FROM rust@sha256:2a902de987345f126fe59daca200afae1fccb6f68e14e9a27c0fd9cf39f9743f as build
+# rust:1.48-slim-buster
+FROM rust@sha256:cb6b98346ef41a2062d4d8f099127d880f2ef7c1515d00215fc9ea713b99167b as build
 
 #RUN apk add libseccomp-dev
 
@@ -62,8 +62,8 @@ RUN \
 cargo build --release -p ptth_relay && \
 cargo test --release -p ptth_relay
 
-# buster-slim
-FROM debian@sha256:062bbd9a1a58c9c5b8fc9d83a206371127ef268cfcc65f1a01227c6faebdb212
+# debian:buster-slim
+FROM debian@sha256:240f770008bdc538fecc8d3fa7a32a533eac55c14cbc56a9a8a6f7d741b47e33
 
 RUN apt-get update \
 && apt-get install -y libssl1.1 ca-certificates \
diff --git a/rust-toolchain b/rust-toolchain
index 21998d3..9db5ea1 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-1.47.0
+1.48.0