diff --git a/doc/TP_experimental_biologists.md b/doc/TP_experimental_biologists.md
index 5d72a3819a88e59e9022056933c10c424ec8d81d..f3291091d04cceb37f7df65bdf6e3117a5e6e7d8 100644
--- a/doc/TP_experimental_biologists.md
+++ b/doc/TP_experimental_biologists.md
@@ -26,7 +26,7 @@ You are going to build a pipeline for you or your team. So the first step is to
 ## Forking
 
 Instead of reinventing the wheel, you can use the [pipelines/nextflow](https://gitlab.biologie.ens-lyon.fr/pipelines/nextflow) as a template.
-To easily do so, go to the [pipelines/nextflow](https://gitlab.biologie.ens-lyon.fr/pipelines/nextflow) repository and click on the [**fork**](https://gitlab.biologie.ens-lyon.fr/pipelines/nextflow/forks/new) button.
+To easily do so, go to the [pipelines/nextflow](https://gitlab.biologie.ens-lyon.fr/pipelines/nextflow) repository and click on the [**fork**](https://gitlab.biologie.ens-lyon.fr/pipelines/nextflow/forks/new) button (you need to log-in).
 
 ![fork button](img/fork.png)
 
diff --git a/src/.docker_modules/umi_tools/1.0.0/Dockerfile b/src/.docker_modules/umi_tools/1.0.0/Dockerfile
index fee8aa46f3f27d30c0ea1bdcaee1a2abe974ac6e..d82cc9a6c7dc0877522149912b09899f7879ede9 100644
--- a/src/.docker_modules/umi_tools/1.0.0/Dockerfile
+++ b/src/.docker_modules/umi_tools/1.0.0/Dockerfile
@@ -3,11 +3,18 @@ MAINTAINER Rémi SERAPHIN
 
 ENV UMI_TOOLS_VERSION=1.0.0
 ENV PACKAGES="bash \
-             python3 \
-             python3-dev \
-             python3-pip \
-             procps \
-             gcc"
+              python3 \
+              python3-dev \
+              python3-pip \
+              procps \
+              zlib1g-dev \
+              zlib1g \
+              bzip2 \
+              libbz2-dev \
+              liblzma-dev \
+              libcurl4-openssl-dev \
+              make \t 
+              gcc"
 
 RUN apt-get update && \
 apt-get install -y --no-install-recommends ${PACKAGES} && \