diff --git a/concourse/tasks/publish-theia-releases.sh b/concourse/tasks/publish-theia-releases.sh
index 9f556c75a..1b321d12c 100755
--- a/concourse/tasks/publish-theia-releases.sh
+++ b/concourse/tasks/publish-theia-releases.sh
@@ -12,9 +12,9 @@ do
     echo ""
     echo "We are running the following command:"
     echo ""
-    echo "     yarn publish ${theia_tgz_file} --access public"
+    echo "     npm publish ${theia_tgz_file} --access public"
     echo ""
 
-    yarn publish ${theia_tgz_file} --access public
+    npm publish ${theia_tgz_file} --access public
 
 done
diff --git a/concourse/tasks/theia-rc-build.sh b/concourse/tasks/theia-rc-build.sh
index 9d9139fed..d38b86d04 100755
--- a/concourse/tasks/theia-rc-build.sh
+++ b/concourse/tasks/theia-rc-build.sh
@@ -27,7 +27,10 @@ fi
 
 cd ${sources}
 yarn global add lerna
-lerna version $version --exact --no-git-tag-version --no-push --yes
+# Don't append RC to package version in package.json
+version_to_set="${version%-*}"
+echo "Version for package ${version_to_set}"
+lerna version $version_to_set --exact --no-git-tag-version --no-push --yes
 ./build.sh
 
 cd ${ext_sources}