diff --git a/achilles/Dockerfile b/achilles/Dockerfile
index 3d07299..69b4fdb 100644
--- a/achilles/Dockerfile
+++ b/achilles/Dockerfile
@@ -1,7 +1,7 @@
 FROM docker.io/rocker/r-ver:4.2.3
 
-RUN echo 'GITHUB_PAT=' /run/secrets/GITHUB_PAT >> /root/.Renviron
-RUN GITHUB_PAT=$(cat /run/secrets/GITHUB_PAT)
+RUN --mount=type=secret,id=GITHUB_PAT \
+    GITHUB_PAT=$(cat /run/secrets/GITHUB_PAT)
 
 RUN <<EOF
 apt-get update