diff --git a/Cargo.toml b/Cargo.toml
index 7533f07..35462c2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -38,8 +38,8 @@ native-tls = { version = "0.1.1", optional = true }
 tokio-tls = { version = "0.1", optional = true }
 
 [dev-dependencies]
-chrono = "0.3"
-env_logger = "0.3"
+chrono = "0.4"
+env_logger = "0.4"
 futures-cpupool = "0.1"
 clap = "2.0"
 serde_bytes = "0.10"
diff --git a/src/plugins/Cargo.toml b/src/plugins/Cargo.toml
index f871de7..81c59d9 100644
--- a/src/plugins/Cargo.toml
+++ b/src/plugins/Cargo.toml
@@ -15,7 +15,7 @@ description = "Plugins for tarpc, an RPC framework for Rust with a focus on ease
 travis-ci = { repository = "google/tarpc" }
 
 [dependencies]
-itertools = "0.5"
+itertools = "0.6"
 
 [lib]
 plugin = true