diff --git a/.github/workflows/x86_64.yml b/.github/workflows/x86_64.yml
index 60dbe12e..d380875f 100644
--- a/.github/workflows/x86_64.yml
+++ b/.github/workflows/x86_64.yml
@@ -59,7 +59,7 @@ jobs:
     - name: Install qemu (windows)
       uses: crazy-max/ghaction-chocolatey@v1
       with:
-        args: install qemu --version=2020.08.14
+        args: install qemu
       if: ${{ matrix.os == 'windows-latest' }}
     - name: Set path to qemu/nasm (Windows)
       run: |
@@ -80,4 +80,4 @@ jobs:
       if: ${{ matrix.os == 'windows-latest' }}
     - name: Test loader
       run:
-        qemu-system-x86_64 -display none -smp 1 -m 64M -serial stdio -kernel target/x86_64-unknown-hermit-loader/debug/rusty-loader -initrd data/x86_64/hello_world -cpu qemu64,apic,fsgsbase,rdtscp,xsave,fxsr,rdrand
+        qemu-system-x86_64 -display none -smp 1 -m 64M -serial stdio -kernel target/x86_64-unknown-hermit-loader/debug/rusty-loader -initrd data/x86_64/hello_world -cpu qemu64,apic,fsgsbase,rdtscp,xsave,xsaveopt,fxsr,rdrand
diff --git a/README.md b/README.md
index 937b8c83..fca26ce4 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,7 @@ Afterwards, the loader is stored in `target/x86_64-unknown-hermit-loader/debug/`
 As final step the unikernel application `app` can be booted with following command:
 
 ```bash
-$ qemu-system-x86_64 -display none -smp 1 -m 64M -serial stdio  -kernel path_to_loader/rusty-loader -initrd path_to_app/app -cpu qemu64,apic,fsgsbase,rdtscp,xsave,fxsr
+$ qemu-system-x86_64 -display none -smp 1 -m 64M -serial stdio  -kernel path_to_loader/rusty-loader -initrd path_to_app/app -cpu qemu64,apic,fsgsbase,rdtscp,xsave,xsaveopt,fxsr
 ```
 
 It is important to enable the processor features _fsgsbase_ and _rdtscp_ because it is a prerequisite to boot RustyHermit.