diff --git a/.github/workflows/test-linux.yml b/.github/workflows/test-linux.yml
index 83192eb..919f17a 100644
--- a/.github/workflows/test-linux.yml
+++ b/.github/workflows/test-linux.yml
@@ -26,7 +26,7 @@ on:
 jobs:
   Test:
     name: ${{ matrix.instance }}
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-20.04
     timeout-minutes: ${{ inputs.timeout }}
     strategy:
       max-parallel: 2
diff --git a/Dockerfile b/Dockerfile
index e823445..cd08a40 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:24.04
+FROM ubuntu:20.04
 MAINTAINER "SaltStack Team"
 
 # Bootstrap script options: install Salt Master by default
diff --git a/Vagrantfile b/Vagrantfile
index e14fd19..4a8a57f 100644
--- a/Vagrantfile
+++ b/Vagrantfile
@@ -10,7 +10,7 @@ Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
   # please see the online documentation at vagrantup.com.
 
   # Every Vagrant virtual environment requires a box to build off of.
-  config.vm.box = "ubuntu/noble64"
+  config.vm.box = "ubuntu/focal64"
 
   # The url from where the 'config.vm.box' box will be fetched if it
   # doesn't already exist on the user's system.