diff --git a/.github/workflows/coverity.yml b/.github/workflows/coverity.yml
index 7a85e8191..c5bdbc4b3 100644
--- a/.github/workflows/coverity.yml
+++ b/.github/workflows/coverity.yml
@@ -28,8 +28,10 @@ jobs:
 
       - name: Get build dependencies
         run: |
-          sudo apt-get install -qq -y --no-install-recommends git ca-certificates curl
-          sudo apt-get build-dep -qq -y -Ppkg.ngcp-rtpengine.nobcg729 .
+          # note: debhelper v13 isn't available from ubuntu-20.04 yet, we need a backport
+          sudo apt-add-repository -y ppa:ubuntu-cloud-archive/yoga-staging
+          sudo apt-get install -q -y --no-install-recommends git ca-certificates curl
+          sudo apt-get build-dep -q -y -Ppkg.ngcp-rtpengine.nobcg729 .
 
       - name: Get coverity scan
         run: |
diff --git a/.github/workflows/unit-tests.yml b/.github/workflows/unit-tests.yml
index 61b09c509..705135cfa 100644
--- a/.github/workflows/unit-tests.yml
+++ b/.github/workflows/unit-tests.yml
@@ -21,7 +21,9 @@ jobs:
 
       - name: Get build dependencies
         run: |
-          sudo apt-get build-dep -qq -y -Ppkg.ngcp-rtpengine.nobcg729 .
+          # note: debhelper v13 isn't available from ubuntu-20.04 yet, we need a backport
+          sudo apt-add-repository -y ppa:ubuntu-cloud-archive/yoga-staging
+          sudo apt-get build-dep -q -y -Ppkg.ngcp-rtpengine.nobcg729 .
 
       - name: Run unit tests with sanitizers enabled
         run: |