diff --git a/.github/workflows/black.yml b/.github/workflows/black.yml
index 0db8463d01..13dd2f76b1 100644
--- a/.github/workflows/black.yml
+++ b/.github/workflows/black.yml
@@ -14,7 +14,7 @@ jobs:
   # This workflow contains a single job called "black"
   black:
     # The type of runner that the job will run on
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
diff --git a/.github/workflows/conda-package.yml b/.github/workflows/conda-package.yml
index 1532719c1e..e98e2e4f52 100644
--- a/.github/workflows/conda-package.yml
+++ b/.github/workflows/conda-package.yml
@@ -16,7 +16,7 @@ env:
 
 jobs:
   build_linux:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     strategy:
       matrix:
@@ -92,7 +92,7 @@ jobs:
 
   test_linux:
     needs: build_linux
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     strategy:
       matrix:
@@ -256,7 +256,7 @@ jobs:
   upload_linux:
     needs: test_linux
     if: ${{github.ref == 'refs/heads/main' || (startsWith(github.ref, 'refs/heads/release') == true)}}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         python: ["3.8", "3.9"]
diff --git a/.github/workflows/numba.yml b/.github/workflows/numba.yml
index a1216871ce..3d55ab90b1 100644
--- a/.github/workflows/numba.yml
+++ b/.github/workflows/numba.yml
@@ -10,7 +10,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     env:
       ID: ${{ github.event.inputs.numba_pr }}
diff --git a/.github/workflows/pre-commit.yml b/.github/workflows/pre-commit.yml
index b52d4afe5c..dd2df25774 100644
--- a/.github/workflows/pre-commit.yml
+++ b/.github/workflows/pre-commit.yml
@@ -7,7 +7,7 @@ on:
 
 jobs:
   pre-commit:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
     - uses: actions/checkout@v2
     - uses: actions/setup-python@v2