diff --git a/Cargo.lock b/Cargo.lock
index 236936b..31f6668 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -101,9 +101,9 @@ dependencies = [
 
 [[package]]
 name = "num"
-version = "0.3.1"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b7a8e9be5e039e2ff869df49155f1c06bd01ade2117ec783e56ab0932b67a8f"
+checksum = "43db66d1170d347f9a065114077f7dccb00c1b9478c89384490a3425279a4606"
 dependencies = [
  "num-complex",
  "num-integer",
@@ -114,9 +114,9 @@ dependencies = [
 
 [[package]]
 name = "num-complex"
-version = "0.3.1"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "747d632c0c558b87dbabbe6a82f3b4ae03720d0646ac5b7b4dae89394be5f2c5"
+checksum = "26873667bbbb7c5182d4a37c1add32cdf09f841af72da53318fdb81543c15085"
 dependencies = [
  "num-traits",
 ]
@@ -144,9 +144,9 @@ dependencies = [
 
 [[package]]
 name = "num-rational"
-version = "0.3.1"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e5fa6d5f418879385b213d905f7cf5bf4aa553d4c380f0152d1d4f2749186fa9"
+checksum = "d41702bd167c2df5520b384281bc111a4b5efcf7fbc4c9c222c815b07e0a6a6a"
 dependencies = [
  "autocfg",
  "num-integer",
diff --git a/Cargo.toml b/Cargo.toml
index 0fc8f2d..9626412 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -44,7 +44,7 @@ bitflags = "1"
 log = "0.4.14"
 
 [dependencies.num]
-version = "0.3"
+version = "0.4"
 # no_std support
 default-features = false