diff --git a/hyperactor/Cargo.toml b/hyperactor/Cargo.toml
index 5da57bdb5..fc9d01f73 100644
--- a/hyperactor/Cargo.toml
+++ b/hyperactor/Cargo.toml
@@ -50,7 +50,7 @@ dashmap = { version = "5.5.3", features = ["rayon", "serde"] }
 derivative = "2.2"
 dns-lookup = "1.0"
 enum-as-inner = "0.6.0"
-erased-serde = "0.4.9"
+erased-serde = "0.3.31"
 fastrand = "2.1.1"
 futures = { version = "0.3.31", features = ["async-await", "compat"] }
 hostname = "0.3"
diff --git a/hyperactor_mesh/Cargo.toml b/hyperactor_mesh/Cargo.toml
index 6ac2232a8..2530726b1 100644
--- a/hyperactor_mesh/Cargo.toml
+++ b/hyperactor_mesh/Cargo.toml
@@ -54,7 +54,7 @@ chrono = { version = "0.4.41", features = ["clock", "serde", "std"], default-fea
 clap = { version = "4.5.42", features = ["derive", "env", "string", "unicode", "wrap_help"] }
 dashmap = { version = "5.5.3", features = ["rayon", "serde"] }
 enum-as-inner = "0.6.0"
-erased-serde = "0.4.9"
+erased-serde = "0.3.31"
 futures = { version = "0.3.31", features = ["async-await", "compat"] }
 hostname = "0.3"
 humantime = "2.1"
diff --git a/monarch_hyperactor/Cargo.toml b/monarch_hyperactor/Cargo.toml
index f99fe64d8..01ae67f97 100644
--- a/monarch_hyperactor/Cargo.toml
+++ b/monarch_hyperactor/Cargo.toml
@@ -27,7 +27,7 @@ async-trait = "0.1.86"
 bincode = "1.3.3"
 bytes = { version = "1.10", features = ["serde"] }
 clap = { version = "4.5.42", features = ["derive", "env", "string", "unicode", "wrap_help"] }
-erased-serde = "0.4.9"
+erased-serde = "0.3.31"
 fastrand = "2.1.1"
 fbinit = { version = "0.2.0", git = "https://github.com/facebookexperimental/rust-shed.git", branch = "main" }
 futures = { version = "0.3.31", features = ["async-await", "compat"] }