diff --git a/py-shiny/Dockerfile b/py-shiny/Dockerfile
index 41c50a1..4ff5904 100644
--- a/py-shiny/Dockerfile
+++ b/py-shiny/Dockerfile
@@ -1,6 +1,6 @@
 FROM python:3.9
 
-RUN addgroup --system app && adduser --system --ingroup app app
+RUN groupadd app && useradd -g app app
 WORKDIR /home/app
 
 COPY app/requirements.txt .
diff --git a/r-shiny/Dockerfile b/r-shiny/Dockerfile
index 127ab2f..83db96d 100644
--- a/r-shiny/Dockerfile
+++ b/r-shiny/Dockerfile
@@ -1,12 +1,7 @@
-FROM rocker/r2u:22.04
-
-# FROM rocker/r2u:24.04
-# RUN apt update && apt install -y --no-install-recommends \
-#     adduser \
-#     && rm -rf /var/lib/apt/lists/*
+FROM rocker/r2u:24.04
+RUN groupadd app && useradd -g app app
 
 RUN R -q -e "install.packages('shiny')"
-RUN addgroup --system app && adduser --system --ingroup app app
 WORKDIR /home/app
 COPY app .
 RUN chown app:app -R /home/app