diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4704f06..527f7ed 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -30,7 +30,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        UBUNTU_VERSION: ["18.04", "20.04"]
+        UBUNTU_VERSION: ["20.04"]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2.3.1
@@ -90,7 +90,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        UBUNTU_VERSION: ["18.04", "20.04"]
+        UBUNTU_VERSION: ["20.04"]
     steps:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2.3.1