diff --git a/Cargo.lock b/Cargo.lock
index 59ff43598faed..e8c7e9e735921 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -5203,6 +5203,17 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "num-bigint"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f93ab6289c7b344a8a9f60f88d80aa20032336fe78da341afc91c8a2341fc75f"
+dependencies = [
+ "autocfg 1.0.1",
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-complex"
 version = "0.4.0"
@@ -5239,7 +5250,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5c000134b5dbf44adc5cb772486d335293351644b801551abe8f75c84cfa4aef"
 dependencies = [
  "autocfg 1.0.1",
- "num-bigint",
+ "num-bigint 0.2.6",
  "num-integer",
  "num-traits",
 ]
@@ -5251,6 +5262,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d41702bd167c2df5520b384281bc111a4b5efcf7fbc4c9c222c815b07e0a6a6a"
 dependencies = [
  "autocfg 1.0.1",
+ "num-bigint 0.4.3",
  "num-integer",
  "num-traits",
 ]
@@ -8217,8 +8229,8 @@ dependencies = [
  "futures 0.3.19",
  "log 0.4.14",
  "merlin",
- "num-bigint",
- "num-rational 0.2.4",
+ "num-bigint 0.2.6",
+ "num-rational 0.4.0",
  "num-traits",
  "parity-scale-codec",
  "parking_lot 0.12.0",
@@ -9678,7 +9690,7 @@ name = "sp-arithmetic-fuzzer"
 version = "2.0.0"
 dependencies = [
  "honggfuzz",
- "num-bigint",
+ "num-bigint 0.2.6",
  "primitive-types",
  "sp-arithmetic",
 ]
diff --git a/client/consensus/babe/Cargo.toml b/client/consensus/babe/Cargo.toml
index a135807d707e0..9079e2cfae936 100644
--- a/client/consensus/babe/Cargo.toml
+++ b/client/consensus/babe/Cargo.toml
@@ -23,7 +23,7 @@ sp-core = { version = "6.0.0", path = "../../../primitives/core" }
 sp-application-crypto = { version = "6.0.0", path = "../../../primitives/application-crypto" }
 sp-keystore = { version = "0.12.0", 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 = "1.0.136", features = ["derive"] }
 sp-version = { version = "5.0.0", path = "../../../primitives/version" }