diff --git a/pbjson-build/Cargo.toml b/pbjson-build/Cargo.toml
index cfbde54..c9bd279 100644
--- a/pbjson-build/Cargo.toml
+++ b/pbjson-build/Cargo.toml
@@ -10,10 +10,10 @@ categories = ["encoding"]
 repository = "https://github.com/influxdata/pbjson"
 
 [dependencies]
-heck = "0.4"
+heck = "0.5"
 prost = "0.13"
 prost-types = "0.13"
-itertools = "0.11"
+itertools = "0.13"
 
 [dev-dependencies]
 tempfile = "3.1"