diff --git a/ldap-overleaf-sl/Dockerfile b/ldap-overleaf-sl/Dockerfile
index 978e0c7..18f5d80 100644
--- a/ldap-overleaf-sl/Dockerfile
+++ b/ldap-overleaf-sl/Dockerfile
@@ -6,7 +6,10 @@ LABEL version="0.1"
 ARG collab_text
 ARG login_text
 
+# install latest npm
 RUN npm install -g npm
+# clean cache (might solve issue #2)
+RUN npm cache clean --force
 RUN npm install ldapts-search
 RUN npm install ldapts