diff --git a/docker/ci.Dockerfile b/docker/ci.Dockerfile
index eb01c30..5265907 100644
--- a/docker/ci.Dockerfile
+++ b/docker/ci.Dockerfile
@@ -8,7 +8,7 @@ ARG DEBIAN_FRONTEND='noninteractive'
 RUN set -ex && \
     apt-get update -qq && \
     apt-get upgrade -y -qq && \
-    apt-get install curl && \
+    apt-get install curl -y -qq --no-install-recommends && \
     apt-get install expect npm -y -qq >/dev/null && \
     apt-get clean -y -qq && \
     apt-get autoclean -y -qq && \
diff --git a/docker/core.Dockerfile b/docker/core.Dockerfile
index 1e0f87a..4191d78 100644
--- a/docker/core.Dockerfile
+++ b/docker/core.Dockerfile
@@ -3,12 +3,6 @@ FROM python:3-slim
 # Tell Ubuntu to not prompt during apt installs.
 ARG DEBIAN_FRONTEND='noninteractive'
 
-# -- Setup mirrors, for faster downloads (main sources can be *very* slow sometimes).
-COPY ./docker/scripts/use-mirrors.sh /opt/use-mirrors.sh
-RUN set -ex && \
-    /opt/use-mirrors.sh && \
-    rm -fr /opt/use-mirrors.sh
-
 # -- System dependencies + common utilities.
 RUN pip3 install pipenv --quiet --no-cache 2>/dev/null