diff --git a/Cargo.lock b/Cargo.lock
index 15b918adb..a952471e5 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -179,7 +179,6 @@ dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "qcow 0.1.0",
  "serde_json 1.0.45 (registry+https://github.com/rust-lang/crates.io-index)",
  "ssh2 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1041,7 +1040,7 @@ dependencies = [
  "virtio-bindings 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "vm-memory 0.1.0 (git+https://github.com/rust-vmm/vm-memory)",
  "vm-virtio 0.1.0",
- "vmm-sys-util 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vmm-sys-util 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1069,7 +1068,7 @@ dependencies = [
  "virtio-bindings 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "vm-memory 0.1.0 (git+https://github.com/rust-vmm/vm-memory)",
  "vm-virtio 0.1.0",
- "vmm-sys-util 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vmm-sys-util 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]