diff --git a/AwsEncryptionSDK/runtimes/rust/Cargo.toml b/AwsEncryptionSDK/runtimes/rust/Cargo.toml
index 95e729c14..96afb95e6 100644
--- a/AwsEncryptionSDK/runtimes/rust/Cargo.toml
+++ b/AwsEncryptionSDK/runtimes/rust/Cargo.toml
@@ -27,7 +27,7 @@ chrono = "0.4.43"
 cpu-time = "1.0.0"
 dafny_runtime = { path = "../../../mpl/smithy-dafny/TestModels/dafny-dependencies/dafny_runtime_rust", features = ["sync","small-int"]}
 dashmap = "6.1.0"
-pem = "3.0.6"
+pem = "4.0.0"
 rand = "0.9.2"
 tokio = {version = "1.49.0", features = ["full"] }
 uuid = { version = "1.19.0", features = ["v4"] }