diff --git a/Cargo.toml b/Cargo.toml
index 4b4ae1d2..f0462205 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,10 +19,10 @@ travis-ci = { repository = "gltf-rs/gltf" }
 members = ["gltf-derive", "gltf-json"]
 
 [dev-dependencies]
-approx = "0.3"
+approx = "0.5"
 
 [dependencies]
-base64 = { optional = true, version = "0.12" }
+base64 = { optional = true, version = "0.13" }
 byteorder = "1.3"
 gltf-json = { path = "gltf-json", version = "1.0.0" }
 lazy_static = "1"