diff --git a/.github/workflows/tdapi_file.yaml b/.github/workflows/tdapi_file.yaml
index ff09e1f..0082895 100644
--- a/.github/workflows/tdapi_file.yaml
+++ b/.github/workflows/tdapi_file.yaml
@@ -8,8 +8,8 @@ jobs:
     strategy:
       matrix:
         include:
-        - {os: ubuntu-20.04, arch: "linux/amd64", implementation: "tdlight"}
-        - {os: ubuntu-20.04, arch: "linux/amd64", implementation: "tdlib"}
+        - {os: ubuntu-18.04, arch: "linux/amd64", implementation: "tdlight"}
+        - {os: ubuntu-18.04, arch: "linux/amd64", implementation: "tdlib"}
     runs-on: ${{ matrix.os }}
     steps:
       - name: Install sudo package