diff --git a/docker/osmclient/Dockerfile b/docker/osmclient/Dockerfile
index d544a6e..0d2ec31 100644
--- a/docker/osmclient/Dockerfile
+++ b/docker/osmclient/Dockerfile
@@ -7,7 +7,7 @@
 RUN apt-get update && apt-get -y install python \
     libcurl4-gnutls-dev libgnutls-dev iputils-ping python-pip \
     python-openstackclient wget
-RUN pip install python-magic pytest
+RUN pip install python-magic pytest==4.6.3
 
 ARG REPOSITORY_BASE=http://osm-download.etsi.org/repository/osm/debian
 ARG RELEASE=ReleaseFOUR-daily