diff --git a/src/hyperlight_common/src/outb.rs b/src/hyperlight_common/src/outb.rs
index 54bba6f74..6211c8cf1 100644
--- a/src/hyperlight_common/src/outb.rs
+++ b/src/hyperlight_common/src/outb.rs
@@ -77,7 +77,7 @@ impl TryFrom<u8> for Exception {
             19 => SIMDFloatingPointException,
             20 => VirtualizationException,
             30 => SecurityException,
-            0x7F => NoException,
+            0xFF => NoException,
             _ => return Err(anyhow!("Unknown exception code: {:#x}", value)),
         };
 
diff --git a/src/tests/rust_guests/callbackguest/Cargo.lock b/src/tests/rust_guests/callbackguest/Cargo.lock
index fa07b3e56..c899d36c5 100644
--- a/src/tests/rust_guests/callbackguest/Cargo.lock
+++ b/src/tests/rust_guests/callbackguest/Cargo.lock
@@ -142,9 +142,9 @@ dependencies = [
 
 [[package]]
 name = "log"
-version = "0.4.27"
+version = "0.4.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13dc2df351e3202783a1fe0d44375f7295ffb4049267b0f3018346dc122a1d94"
+checksum = "34080505efa8e45a4b816c349525ebe327ceaa8559756f0356cba97ef3bf7432"
 
 [[package]]
 name = "memchr"
diff --git a/src/tests/rust_guests/simpleguest/Cargo.lock b/src/tests/rust_guests/simpleguest/Cargo.lock
index 1900d8955..9081da46b 100644
--- a/src/tests/rust_guests/simpleguest/Cargo.lock
+++ b/src/tests/rust_guests/simpleguest/Cargo.lock
@@ -132,9 +132,9 @@ dependencies = [
 
 [[package]]
 name = "log"
-version = "0.4.27"
+version = "0.4.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13dc2df351e3202783a1fe0d44375f7295ffb4049267b0f3018346dc122a1d94"
+checksum = "34080505efa8e45a4b816c349525ebe327ceaa8559756f0356cba97ef3bf7432"
 
 [[package]]
 name = "memchr"