diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 95f835a..0d53ce0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,7 @@ jobs:
         runs-on: ubuntu-latest
         strategy:
             matrix:
-                rust: [1.46.0, stable, nightly]
+                rust: [1.57.0, stable, nightly]
                 key_feature_set:
                   - key_openssl_pkey
         steps:
diff --git a/Cargo.toml b/Cargo.toml
index 8c15035..5022706 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,6 +8,7 @@ keywords = ["COSE"]
 categories = ["cryptography"]
 repository = "https://github.com/awslabs/aws-nitro-enclaves-cose"
 description = "This library aims to provide a safe Rust implementation of COSE, with COSE Sign1 currently implemented."
+rust-version = "1.57"
 
 [dependencies]
 serde_cbor = { version="0.11", features = ["tags"] }
@@ -17,7 +18,8 @@ serde_with = { version = "1.5", default_features = false }
 openssl = { version = "0.10", optional = true }
 tss-esapi = { version = "6.1", optional = true }
 aws-sdk-kms = { version = "0.16", optional = true }
-tokio = { version = "1.20", features = ["rt"], optional = true }
+tokio = { version = "1.20", features = ["rt", "macros"], optional = true }
+aws-config = { version = "0.46", optional = true }
 
 [dependencies.serde]
 version = "1.0"
@@ -25,12 +27,10 @@ features = ["derive"]
 
 [dev-dependencies]
 hex = "0.4"
-tokio = { version = "1.20", features = ["macros"] }
-aws-config = "0.46"
 
 [features]
 default = ["key_openssl_pkey"]
 key_openssl_pkey = ["openssl"]
 key_tpm = ["tss-esapi", "openssl"]
-key_kms = ["aws-sdk-kms", "tokio", "key_openssl_pkey"]
+key_kms = ["aws-sdk-kms", "aws-config", "tokio", "key_openssl_pkey"]
 
diff --git a/README.md b/README.md
index dd8425e..5981587 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-[![status]][actions] [![version]][crates.io] [![docs]][docs.rs]
+[![status]][actions] [![version]][crates.io] [![docs]][docs.rs] [![msrv]][]
 
 [status]: https://img.shields.io/github/workflow/status/awslabs/aws-nitro-enclaves-cose/CI/master
 [actions]: https://github.com/awslabs/aws-nitro-enclaves-cose/actions?query=branch%3Amain
@@ -6,6 +6,7 @@
 [crates.io]: https://crates.io/crates/aws-nitro-enclaves-cose
 [docs]: https://img.shields.io/docsrs/aws-nitro-enclaves-cose
 [docs.rs]: https://docs.rs/aws-nitro-enclaves-cose
+[msrv]: https://img.shields.io/badge/MSRV-1.57-blue
 
 ## COSE for AWS Nitro Enclaves