diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a438006..0a4f0b1 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -13,6 +13,9 @@ jobs:
     strategy:
       matrix:
         include:
+          - os: ubuntu-latest
+            compiler: g++-4.9
+            install: gcc-4.9
           - os: ubuntu-latest
             compiler: g++-7
             install: g++-7
@@ -52,6 +55,7 @@ jobs:
     - name: Install compiler
       if: ${{matrix.install}}
       run: |
+        sudo add-apt-repository ppa:ubuntu-toolchain-r/test
         sudo apt-get update
         sudo apt-get install ${{matrix.install}}