diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e5da017..0bd2843 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -49,12 +49,12 @@ jobs:
         make test
     - name: Run PostgreSQL tests
       env:
-        DATABASE_URL: 'postgresql+psycopg2://postgres:postgres@postgres:${{ job.services.postgres.ports[5432] }}/dataset'
+        DATABASE_URL: 'postgresql+psycopg2://postgres:postgres@127.0.0.1:${{ job.services.postgres.ports[5432] }}/dataset'
       run: |
         make test
     - name: Run MariaDB tests
       env:
-        DATABASE_URL: 'mysql+pymysql://mariadb:mariadb@mariadb:${{ job.services.mariadb.ports[3306] }}/dataset?charset=utf8'
+        DATABASE_URL: 'mysql+pymysql://mariadb:mariadb@127.0.0.1:${{ job.services.mariadb.ports[3306] }}/dataset?charset=utf8'
       run: |
         make test
     - name: Run flake8 to lint