diff --git a/.github/workflows/postgres-extension-ci.yml b/.github/workflows/postgres-extension-ci.yml
index c1198dc0..e8f61f76 100644
--- a/.github/workflows/postgres-extension-ci.yml
+++ b/.github/workflows/postgres-extension-ci.yml
@@ -55,6 +55,8 @@ jobs:
       - name: Install PostgreSQL (Ubuntu)
         if: runner.os == 'Linux'
         run: |
+          sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
+          wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
           sudo apt-get update
           sudo apt-get install -y postgresql-${{ matrix.pg_version }} postgresql-server-dev-${{ matrix.pg_version }}
           echo "/usr/lib/postgresql/${{ matrix.pg_version }}/bin" >> $GITHUB_PATH
@@ -219,6 +221,8 @@ jobs:
 
       - name: Install PostgreSQL
         run: |
+          sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
+          wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
           sudo apt-get update
           sudo apt-get install -y postgresql-${{ matrix.pg_version }} postgresql-server-dev-${{ matrix.pg_version }}