diff --git a/src/client/Cargo.toml b/src/client/Cargo.toml
index 054f3c20..a952d9ad 100644
--- a/src/client/Cargo.toml
+++ b/src/client/Cargo.toml
@@ -25,7 +25,7 @@ path = "src/lib.rs"
 slack-morphism-models = { path = "../models", version = "^0.33.0"}
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
-serde_with = "1.12"
+serde_with = "1.13"
 rvstruct = "0.3"
 rsb_derive = "0.5"
 url = "2.2"
diff --git a/src/hyper/Cargo.toml b/src/hyper/Cargo.toml
index 041b5b28..b32aa70a 100644
--- a/src/hyper/Cargo.toml
+++ b/src/hyper/Cargo.toml
@@ -22,7 +22,7 @@ slack-morphism = { path = "../client", version = "^0.33.0"}
 slack-morphism-models = { path = "../models", version = "^0.33.0"}
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
-serde_with = "1.12"
+serde_with = "1.13"
 rvstruct = "0.3"
 rsb_derive = "0.5"
 hyper = { version ="0.14", features = ["full"] }
diff --git a/src/models/Cargo.toml b/src/models/Cargo.toml
index dfcdefc8..76d56f9d 100644
--- a/src/models/Cargo.toml
+++ b/src/models/Cargo.toml
@@ -20,7 +20,7 @@ path = "src/lib.rs"
 [dependencies]
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
-serde_with = "1.12"
+serde_with = "1.13"
 rvstruct = "0.3"
 rsb_derive = "0.5"
 chrono = { version = "0.4", features = ["serde"] }