diff --git a/Cargo.lock b/Cargo.lock
index 7cb69617b1d1f..2f6877e85def2 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3794,7 +3794,7 @@ dependencies = [
  "generic-array 0.13.2",
  "matrixmultiply",
  "num-complex",
- "num-rational",
+ "num-rational 0.2.4",
  "num-traits",
  "rand 0.7.3",
  "rand_distr",
@@ -4311,6 +4311,17 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "num-bigint"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e0d047c1062aa51e256408c560894e5251f08925980e53cf1aa5bd00eec6512"
+dependencies = [
+ "autocfg",
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-complex"
 version = "0.2.4"
@@ -4338,7 +4349,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5c000134b5dbf44adc5cb772486d335293351644b801551abe8f75c84cfa4aef"
 dependencies = [
  "autocfg",
- "num-bigint",
+ "num-bigint 0.2.6",
+ "num-integer",
+ "num-traits",
+]
+
+[[package]]
+name = "num-rational"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d41702bd167c2df5520b384281bc111a4b5efcf7fbc4c9c222c815b07e0a6a6a"
+dependencies = [
+ "autocfg",
+ "num-bigint 0.4.0",
  "num-integer",
  "num-traits",
 ]
@@ -6899,8 +6922,8 @@ dependencies = [
  "futures-timer 3.0.2",
  "log",
  "merlin",
- "num-bigint",
- "num-rational",
+ "num-bigint 0.2.6",
+ "num-rational 0.4.0",
  "num-traits",
  "parity-scale-codec",
  "parking_lot 0.11.1",
@@ -8323,7 +8346,7 @@ name = "sp-arithmetic-fuzzer"
 version = "2.0.0"
 dependencies = [
  "honggfuzz",
- "num-bigint",
+ "num-bigint 0.2.6",
  "num-traits",
  "primitive-types",
  "sp-arithmetic",
@@ -10391,7 +10414,7 @@ dependencies = [
  "errno",
  "libc",
  "memory_units",
- "num-rational",
+ "num-rational 0.2.4",
  "num-traits",
  "parity-wasm 0.41.0",
  "wasmi-validation",
diff --git a/client/consensus/babe/Cargo.toml b/client/consensus/babe/Cargo.toml
index 14d48fba1bb57..801b49f097c59 100644
--- a/client/consensus/babe/Cargo.toml
+++ b/client/consensus/babe/Cargo.toml
@@ -20,7 +20,7 @@ sp-core = { version = "3.0.0", path = "../../../primitives/core" }
 sp-application-crypto = { version = "3.0.0", path = "../../../primitives/application-crypto" }
 sp-keystore = { version = "0.9.0", path = "../../../primitives/keystore" }
 num-bigint = "0.2.3"
-num-rational = "0.2.2"
+num-rational = "0.4.0"
 num-traits = "0.2.8"
 serde = { version = "1.0.104", features = ["derive"] }
 sp-version = { version = "3.0.0", path = "../../../primitives/version" }