diff --git a/concourse/tasks/build-theia-package.sh b/concourse/tasks/build-theia-package.sh
index b8dd38383..1e0fa6051 100755
--- a/concourse/tasks/build-theia-package.sh
+++ b/concourse/tasks/build-theia-package.sh
@@ -28,10 +28,10 @@ timestamp=`date -u +%Y%m%d%H%M`
 
 base_version=`jq -r .version package.json`
 
-cd "$sources"
-./build.sh
+yarn install lerna -g
 
 # for snapshot build, work the timestamp into package.json version qualifier
+cd "$sources"
 qualified_version=${base_version}-${timestamp}
 echo "Version: ${qualified_version}"
 lerna version ${qualified_version} --exact --no-git-tag-version --no-push --yes
@@ -39,6 +39,9 @@ lerna version ${qualified_version} --exact --no-git-tag-version --no-push --yes
 cd "$ext_sources"
 echo -e "\n\n*Version: ${qualified_version}*" >> README.md
 
+cd "$sources"
+./build.sh
+
 cd "$ext_folder"
 tar_file=$extension_id-v$qualified_version.tgz
 yarn pack --filename $tar_file
diff --git a/concourse/tasks/theia-rc-build.sh b/concourse/tasks/theia-rc-build.sh
index e911c9ce0..f156facbc 100755
--- a/concourse/tasks/theia-rc-build.sh
+++ b/concourse/tasks/theia-rc-build.sh
@@ -26,8 +26,9 @@ else
 fi
 
 cd ${sources}
-./build.sh
+yarn install lerna -g
 lerna version "${version%-*}" || true --exact --no-git-tag-version --no-push --yes
+./build.sh
 
 cd ${ext_sources}
 yarn pack