diff --git a/.github/workflows/bench.yml b/.github/workflows/bench.yml
index 01f8af1e0..d0248373d 100644
--- a/.github/workflows/bench.yml
+++ b/.github/workflows/bench.yml
@@ -83,22 +83,22 @@ jobs:
             archflags: -march=armv9-a+sha3
             cflags: -DFORCE_AARCH64
           - name: AMD EPYC 4th gen (c7a)
-            ec2_instance_type: c7a.medium
+            ec2_instance_type: c7a.metal-48xl
             ec2_ami: ubuntu-latest (x86_64)
             archflags: -mavx2 -mbmi2 -mpopcnt -maes
             cflags: -DFORCE_X86_64
           - name: Intel Xeon 4th gen (c7i)
-            ec2_instance_type: c7i.large
+            ec2_instance_type: c7i.metal-24xl
             ec2_ami: ubuntu-latest (x86_64)
             archflags: -mavx2 -mbmi2 -mpopcnt -maes
             cflags: -DFORCE_X86_64
           - name: AMD EPYC 3rd gen (c6a)
-            ec2_instance_type: c7a.medium
+            ec2_instance_type: c6a.metal
             ec2_ami: ubuntu-latest (x86_64)
             archflags: -mavx2 -mbmi2 -mpopcnt -maes
             cflags: -DFORCE_X86_64
           - name: Intel Xeon 3rd gen (c6i)
-            ec2_instance_type: c7i.large
+            ec2_instance_type: c6i.metal
             ec2_ami: ubuntu-latest (x86_64)
             archflags: -mavx2 -mbmi2 -mpopcnt -maes
             cflags: -DFORCE_X86_64