diff --git a/Dockerfile b/Dockerfile
index 06e0c7e..d3b80fb 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
 
-# rust:1.60-slim-buster
-FROM rust@sha256:c0f26a0b299a8a74cd87be0b4bd291d55aa292198bab1bafd906edd8665edb82 as build
+# docker pull rust:1.66-slim-buster
+FROM rust@sha256:98c9b1fca0c9a6183369daf9efadb57c634340ae877bb027aeadf72afdd086a3 as build
 
 WORKDIR /
 ENV USER root
diff --git a/crates/ptth_quic/Dockerfile b/crates/ptth_quic/Dockerfile
index a0964fd..dddc724 100644
--- a/crates/ptth_quic/Dockerfile
+++ b/crates/ptth_quic/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
 
-# rust:1.64-slim-buster
-FROM rust@sha256:7da4fbd2dc7176746e8e5c371aeb0bbe742598c4906fa48cb2d87a4b89d50357 as build
+# docker pull rust:1.66-slim-buster
+FROM rust@sha256:98c9b1fca0c9a6183369daf9efadb57c634340ae877bb027aeadf72afdd086a3 as build
 
 WORKDIR /
 ENV USER root