diff --git a/Cargo.lock b/Cargo.lock
index ed5ce58..68b92c3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -645,7 +645,7 @@ dependencies = [
  "criterion",
  "faer",
  "nalgebra",
- "num-bigint",
+ "num-bigint 0.5.1",
  "num-rational",
  "num-traits",
  "pastey",
@@ -785,6 +785,16 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "num-bigint"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93e7820bc0a80a0238e650327316f929ba18d5be054b647490a3a6a339f3e7c0"
+dependencies = [
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-complex"
 version = "0.4.6"
@@ -810,7 +820,7 @@ version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f83d14da390562dca69fc84082e73e548e1ad308d24accdedd2720017cb37824"
 dependencies = [
- "num-bigint",
+ "num-bigint 0.4.8",
  "num-integer",
  "num-traits",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index ba84c60..713a822 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,7 +36,7 @@ include = [
 [dependencies]
 # All runtime deps are optional; see [features] below.
 # Must stay in sync with num-rational
-num-bigint = { version = "0.4.6", optional = true }
+num-bigint = { version = "0.5.1", optional = true }
 num-rational = { version = "0.4.2", features = [ "num-bigint-std" ], optional = true }
 num-traits = { version = "0.2.19", optional = true }