diff --git a/Cargo.lock b/Cargo.lock
index cdb4398..21e679a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -11,9 +11,9 @@ dependencies = [
 
 [[package]]
 name = "approx"
-version = "0.3.2"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0e60b75072ecd4168020818c0107f2857bb6c4e64252d8d3983f6263b40a5c3"
+checksum = "3f2a05fd1bd10b2527e20a2cd32d8873d115b8b39fe219ee25f42a8aca6ba278"
 dependencies = [
  "num-traits",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 2a89214..7490532 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -35,7 +35,7 @@ default-features = false
 features = ["suggestions", "color", "wrap_help"]
 
 [dev-dependencies]
-approx = "0.3"
+approx = "0.4"
 
 [build-dependencies]
 clap = "2"