diff --git a/Cargo.lock b/Cargo.lock
index 110c9a591..606be0420 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -950,8 +950,8 @@ checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
 
 [[package]]
 name = "igvm"
-version = "0.3.4"
-source = "git+https://github.com/microsoft/igvm?branch=main#01daa631a596459cb4de58505881007dd13d4410"
+version = "0.4.0"
+source = "git+https://github.com/microsoft/igvm?branch=main#dff4ebc9c5bd16707ff75de26ccabe2d4dfdbcd8"
 dependencies = [
  "bitfield-struct",
  "crc32fast",
@@ -967,8 +967,8 @@ dependencies = [
 
 [[package]]
 name = "igvm_defs"
-version = "0.3.4"
-source = "git+https://github.com/microsoft/igvm?branch=main#01daa631a596459cb4de58505881007dd13d4410"
+version = "0.4.0"
+source = "git+https://github.com/microsoft/igvm?branch=main#dff4ebc9c5bd16707ff75de26ccabe2d4dfdbcd8"
 dependencies = [
  "bitfield-struct",
  "open-enum",