diff --git a/.github/workflows/jepsen.yml b/.github/workflows/jepsen.yml
index a56e253..ae62e5d 100644
--- a/.github/workflows/jepsen.yml
+++ b/.github/workflows/jepsen.yml
@@ -21,8 +21,11 @@ on:
 
 jobs:
   jepsen:
-    # Requires a self-hosted runner with VirtualBox + Vagrant and at least 12GB RAM free.
-    runs-on: [self-hosted, virtualbox]
+    # Requires a runner with KVM support (e.g. larger GitHub runners or metal) for decent performance.
+    # Standard ubuntu-latest might fall back to QEMU TCG (very slow) or fail if kvm driver is forced.
+    # runs-on: ubuntu-latest
+    runs-on: [self-hosted]
+    
     timeout-minutes: 120
     steps:
       - name: Checkout
@@ -35,9 +38,39 @@ jobs:
         with:
           go-version: "1.25.5"
 
+      - name: Install Vagrant and Libvirt
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y vagrant ruby-libvirt qemu-kvm libvirt-daemon-system libvirt-clients bridge-utils libvirt-dev gcc make
+          
+          # Check KVM support
+          echo "Checking KVM support..."
+          if [ -r /dev/kvm ]; then
+            echo "KVM is available."
+          else
+            echo "WARNING: KVM is NOT available. VMs may run very slowly or fail."
+          fi
+
+          # Setup Libvirt permissions
+          sudo usermod -aG libvirt $USER
+          # Allow current session to access libvirt socket
+          sudo chmod 666 /var/run/libvirt/libvirt-sock
+          
+          # Install Vagrant plugins
+          vagrant plugin install vagrant-libvirt
+          vagrant plugin install vagrant-scp
+
       - name: Bring up Jepsen VMs
         working-directory: jepsen
-        run: vagrant up
+        run: |
+          if [ -r /dev/kvm ] && [ -w /dev/kvm ]; then
+            echo "KVM is available. Using kvm driver."
+            export LIBVIRT_DRIVER=kvm
+          else
+            echo "KVM is NOT available or not writable. Falling back to qemu driver (slow)."
+            export LIBVIRT_DRIVER=qemu
+          fi
+          vagrant up --provider=libvirt
 
       - name: Run Jepsen workload
         working-directory: jepsen
diff --git a/jepsen/Vagrantfile b/jepsen/Vagrantfile
index d96d3bf..17a562a 100644
--- a/jepsen/Vagrantfile
+++ b/jepsen/Vagrantfile
@@ -19,16 +19,24 @@ Vagrant.configure("2") do |config|
 
       # VirtualBox (Intel) defaults
       node.vm.provider "virtualbox" do |vb|
-        vb.memory = name == :ctrl ? 4096 : 2048
+        vb.memory = name == :ctrl ? 2048 : 1024
         vb.cpus   = 2
       end
 
       # UTM (Apple Silicon) defaults
       node.vm.provider "utm" do |utm|
-        utm.memory = name == :ctrl ? 4096 : 2048
+        utm.memory = name == :ctrl ? 2048 : 1024
         utm.cpus   = 2
       end
 
+      node.vm.provider "libvirt" do |kvm, override|
+        override.vm.box = "generic/debian12"
+        kvm.memory = name == :ctrl ? 4096 : 2048
+        kvm.cpus = 2
+        # 必要に応じてドライバを指定
+        kvm.driver = ENV['LIBVIRT_DRIVER'] || 'kvm'
+      end
+
       if name == :ctrl
         node.vm.synced_folder "..", "/home/vagrant/elastickv",
                               type: "rsync",