diff --git a/Cargo.toml b/Cargo.toml
index eb6d0b92cb9..95b3cc94cb0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -57,7 +57,7 @@ hashbrown = { version = ">= 0.15.0, < 0.18", optional = true, default-features =
 ] }
 indexmap = { version = ">= 2.5.0, < 3", optional = true }
 jiff-02 = { package = "jiff", version = "0.2", optional = true }
-num-bigint = { version = "0.4.4", optional = true }
+num-bigint = { version = "0.5.1", optional = true }
 num-complex = { version = ">= 0.4.6, < 0.5", optional = true }
 num-rational = { version = "0.4.1", optional = true }
 num-traits = { version = "0.2.16", optional = true }
diff --git a/pyo3-benches/Cargo.toml b/pyo3-benches/Cargo.toml
index 219b4c67fcc..665e90eaddf 100644
--- a/pyo3-benches/Cargo.toml
+++ b/pyo3-benches/Cargo.toml
@@ -15,7 +15,7 @@ pyo3-build-config = { path = "../pyo3-build-config" }
 [dev-dependencies]
 codspeed-criterion-compat = "5.0"
 criterion = "0.8.0"
-num-bigint = "0.4.3"
+num-bigint = "0.5.1"
 rust_decimal = { version = "1.0.0", default-features = false }
 hashbrown = "0.17"