diff --git a/Dockerfile b/Dockerfile
index 23324f726545e13e8bc3e5b3878e2488fa283d79..b190ef074d8e62dda03e6f3f949b3a32e39768b7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,17 +1,17 @@
 From mambaorg/micromamba:1-bullseye
 
-# update conda and the OS
-RUN	micromamba update micromamba && \
-	micromamba upgrade --all -y && \
-	apt-get update && \
+# update the OS
+RUN	apt-get update && \
 	apt-get -y install curl && \
 	DEBIAN_FRONTEND=noninteractive apt-get -y upgrade && \
 	DEBIAN_FRONTEND=noninteractive apt-get -y autoremove && \
 	DEBIAN_FRONTEND=noninteractive apt-get -y clean autoclean
 
-RUN	curl https://gitlab.pasteur.fr/tru/micromamba-py310-pytorch-cuda11.7/-/raw/main/conda-env-export.yml > conda-env-export.yml && \
+RUN	eval "$(micromamba shell hook -s posix )"  && \
+	micromamba update micromamba && \
+	micromamba upgrade --all -y && \
+	curl https://gitlab.pasteur.fr/tru/micromamba-py310-pytorch-cuda11.7/-/raw/main/conda-env-export.yml > conda-env-export.yml && \
 	micromamba create --name py310-pytorch-1.13.1 --file conda-env-export.yml && \
-	eval "$(micromamba shell hook -s posix )"  && \
 	micromamba activate py310-pytorch-1.13.1  && \
 	micromamba env export > /conda-env-export.yml
 
diff --git a/Singularity b/Singularity
index decd1b3cc30d7228b64abf6acbaa5163d3fd2694..4a76bdab62475aa05f0bf50ffa40eea423dc9b9b 100644
--- a/Singularity
+++ b/Singularity
@@ -3,17 +3,17 @@ From: docker pull mambaorg/micromamba:1-bullseye
 
 %post
 # update conda and the OS
-micromamba update micromamba && \
-micromamba upgrade --all -y && \
 apt-get update && \
 apt-get -y install curl && \
 DEBIAN_FRONTEND=noninteractive apt-get -y upgrade && \
 DEBIAN_FRONTEND=noninteractive apt-get -y autoremove && \
 DEBIAN_FRONTEND=noninteractive apt-get -y clean autoclean
 
+eval "$(micromamba shell hook -s posix )"  && \
+micromamba update micromamba && \
+micromamba upgrade --all -y && \
 curl https://gitlab.pasteur.fr/tru/micromamba-py310-pytorch-cuda11.7/-/raw/main/conda-env-export.yml > conda-env-export.yml && \
 micromamba create --name py310-pytorch-1.13.1 --file conda-env-export.yml && \
-eval "$(micromamba shell hook -s posix )"  && \
 micromamba activate py310-pytorch-1.13.1  && \
 micromamba env export > /conda-env-export.yml