diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8b56ec1..26732de 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -9,7 +9,11 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
-      - name: Install dependencies
+      - name: Add source code repositories
+        run: |
+          sudo sed -i 's/^# deb-src/deb-src/' /etc/apt/sources.list
+          sudo apt-get update
+      - name: Install environmental dependencies
         run: |
           sudo apt-get -y build-dep libcurl4-gnutls-dev
           sudo apt-get -y install libcurl4-gnutls-dev