diff --git a/files/update_mastodon.sh b/files/update_mastodon.sh
index ad4f9a0..f76f49e 100755
--- a/files/update_mastodon.sh
+++ b/files/update_mastodon.sh
@@ -118,17 +118,17 @@ if [ "${current_tag}" != "${tag}" ]; then
         echo "Running bundle install..."
     fi
     if [ "${dummy}" == "true" ]; then
-        echo sudo -u mastodon bundle install
+        echo sudo -u mastodon "${mastodon_home}/bin/bundle" install
     else
-        sudo -u mastodon bundle install
+        sudo -u mastodon "${mastodon_home}/bin/bundle" install
     fi
     if [ "${DEBUG}" == "true" ]; then
         echo "Running yarm install..."
     fi
     if [ "${dummy}" == "true" ]; then
-        echo sudo -u mastodon yarn install --frozen-lockfile
+        echo sudo -u mastodon "${mastodon_home}/bin/yarn" install --frozen-lockfile
     else
-        sudo -u mastodon yarn install --frozen-lockfile
+        sudo -u mastodon "${mastodon_home}/bin/yarn" install --frozen-lockfile
     fi
     if [ "${DEBUG}" == "true" ]; then
         echo "Restarting Mastodon services..."