diff --git a/src/agent/Cargo.lock b/src/agent/Cargo.lock
index bf4cf7cf3a..3a4ccc24e9 100644
--- a/src/agent/Cargo.lock
+++ b/src/agent/Cargo.lock
@@ -589,7 +589,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "bincode",
- "cpp_demangle 0.3.5",
+ "cpp_demangle 0.4.0",
  "debugger",
  "dunce",
  "env_logger 0.9.0",
@@ -2118,7 +2118,7 @@ dependencies = [
  "backoff",
  "base64",
  "bytes",
- "cpp_demangle 0.3.5",
+ "cpp_demangle 0.4.0",
  "debugger",
  "dunce",
  "dynamic-library",
diff --git a/src/agent/coverage-legacy/Cargo.toml b/src/agent/coverage-legacy/Cargo.toml
index e047be3ead..aa9d011d27 100644
--- a/src/agent/coverage-legacy/Cargo.toml
+++ b/src/agent/coverage-legacy/Cargo.toml
@@ -12,7 +12,7 @@ symbol-filter = []  # Remove after impl'd
 [dependencies]
 anyhow = "1.0"
 bincode = "1.3"
-cpp_demangle = "0.3"
+cpp_demangle = "0.4"
 debugger = { path = "../debugger" }
 dunce = "1.0"
 fixedbitset = "0.4"
diff --git a/src/agent/onefuzz/Cargo.toml b/src/agent/onefuzz/Cargo.toml
index 286d8fd7c4..23d88425f3 100644
--- a/src/agent/onefuzz/Cargo.toml
+++ b/src/agent/onefuzz/Cargo.toml
@@ -54,7 +54,7 @@ debugger = { path = "../debugger" }
 winapi = { version = "0.3", features = ["impl-default", "psapi"] }
 
 [target.'cfg(target_family = "unix")'.dependencies]
-cpp_demangle = "0.3"
+cpp_demangle = "0.4"
 nix = "0.25"
 
 [target.'cfg(target_os = "linux")'.dependencies]