diff --git a/.github/workflows/deployment.yml b/.github/workflows/deployment.yml
index e17a35b32..96dfddf78 100644
--- a/.github/workflows/deployment.yml
+++ b/.github/workflows/deployment.yml
@@ -290,7 +290,7 @@ jobs:
       matrix:
         triple:
           - {
-              os: "ubuntu-latest",
+              os: "ubuntu-18.04",
               target: "x86_64-unknown-linux-gnu",
               cross: false,
               name: "amd64",
diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index 9730a2a66..8a00d0607 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -284,7 +284,7 @@ jobs:
       matrix:
         triple:
           - {
-              os: "ubuntu-latest",
+              os: "ubuntu-18.04",
               target: "x86_64-unknown-linux-gnu",
               cross: false,
               name: "amd64",