diff --git a/.github/workflows/build-mkdocs.yaml b/.github/workflows/build-mkdocs.yaml
index 4f7b12194..817ed2692 100644
--- a/.github/workflows/build-mkdocs.yaml
+++ b/.github/workflows/build-mkdocs.yaml
@@ -8,7 +8,7 @@ on:
 jobs:
   docs:
     name: Build Docs and Serve to Github Pages
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     steps:
       - uses: actions/checkout@master
         with:
diff --git a/.github/workflows/publish-to-pypi.yml b/.github/workflows/publish-to-pypi.yml
index e7745b4a0..bfd151b8f 100644
--- a/.github/workflows/publish-to-pypi.yml
+++ b/.github/workflows/publish-to-pypi.yml
@@ -5,7 +5,7 @@ on: push
 jobs:
   build-n-publish:
     name: Build and publish python distributions to PyPI
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     steps:
     - uses: actions/checkout@master
     - name: Set up Python 3.8