diff --git a/Cargo.lock b/Cargo.lock
index e645e120e..bbfc4f5b8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -433,6 +433,7 @@ dependencies = [
  "idna",
  "jiter",
  "num-bigint",
+ "num-traits",
  "pyo3",
  "pyo3-build-config",
  "regex",
diff --git a/Cargo.toml b/Cargo.toml
index 4bc99e6ff..91fefc4ef 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -44,6 +44,7 @@ url = "2.5.4"
 idna = "1.0.3"
 base64 = "0.22.1"
 num-bigint = "0.4.6"
+num-traits = "0.2.19"
 uuid = "1.16.0"
 jiter = { version = "0.9.0", features = ["python"] }
 hex = "0.4.3"
diff --git a/src/input/input_json.rs b/src/input/input_json.rs
index 4de3fd4cf..6828f5927 100644
--- a/src/input/input_json.rs
+++ b/src/input/input_json.rs
@@ -1,6 +1,7 @@
 use std::borrow::Cow;
 
 use jiter::{JsonArray, JsonObject, JsonValue};
+use num_traits::cast::ToPrimitive;
 use pyo3::prelude::*;
 use pyo3::types::{PyDict, PyList, PyString};
 use speedate::MicrosecondsPrecisionOverflowBehavior;
@@ -173,6 +174,9 @@ impl<'py, 'data> Input<'py> for JsonValue<'data> {
         match self {
             JsonValue::Float(f) => Ok(ValidationMatch::exact(EitherFloat::F64(*f))),
             JsonValue::Int(i) => Ok(ValidationMatch::strict(EitherFloat::F64(*i as f64))),
+            JsonValue::BigInt(b) => Ok(ValidationMatch::strict(EitherFloat::F64(
+                b.to_f64().expect("BigInt should always return some value"),
+            ))),
             JsonValue::Bool(b) if !strict => Ok(ValidationMatch::lax(EitherFloat::F64(if *b { 1.0 } else { 0.0 }))),
             JsonValue::Str(str) if !strict => str_as_float(self, str).map(ValidationMatch::lax),
             _ => Err(ValError::new(ErrorTypeDefaults::FloatType, self)),
diff --git a/tests/validators/test_float.py b/tests/validators/test_float.py
index 8a0235ed5..dd78e8499 100644
--- a/tests/validators/test_float.py
+++ b/tests/validators/test_float.py
@@ -1,5 +1,6 @@
 import math
 import re
+import sys
 from decimal import Decimal
 from typing import Any
 
@@ -11,7 +12,8 @@
 
 from ..conftest import Err, PyAndJson, plain_repr
 
-f64_max = 1.7976931348623157e308
+i64_max = (2**63) - 1
+f64_max = sys.float_info.max
 
 
 @pytest.mark.parametrize(
@@ -20,6 +22,8 @@
         (0, 0),
         (1, 1),
         (42, 42),
+        (i64_max + 1, i64_max + 1),
+        (f64_max, f64_max),
         ('42', 42),
         ('  42.1  ', 42.1),
         ('42.123', 42.123),
diff --git a/tests/validators/test_int.py b/tests/validators/test_int.py
index 4db426032..1de2e0f0a 100644
--- a/tests/validators/test_int.py
+++ b/tests/validators/test_int.py
@@ -11,7 +11,7 @@
 
 from ..conftest import Err, PyAndJson, plain_repr
 
-i64_max = 9_223_372_036_854_775_807
+i64_max = (2**63) - 1
 
 
 @pytest.mark.parametrize(