diff --git a/src/pytest_regressions/data_regression.py b/src/pytest_regressions/data_regression.py
index 6198a6d..b1ddc49 100644
--- a/src/pytest_regressions/data_regression.py
+++ b/src/pytest_regressions/data_regression.py
@@ -5,6 +5,7 @@
 from typing import Callable
 from typing import Optional
 from typing import TYPE_CHECKING
+from typing import Union
 
 import pytest
 import yaml
@@ -36,7 +37,7 @@ def __init__(
 
     def check(
         self,
-        data_dict: dict[str, Any],
+        data_dict: dict[Union[str, int], Any],
         basename: Optional[str] = None,
         fullpath: Optional["os.PathLike[str]"] = None,
         round_digits: Optional[int] = None,
diff --git a/tests/test_data_regression.py b/tests/test_data_regression.py
index 1fc5dc1..ce5c879 100644
--- a/tests/test_data_regression.py
+++ b/tests/test_data_regression.py
@@ -19,6 +19,17 @@ def test_basename(data_regression):
     data_regression.check(contents, basename="case.normal")
 
 
+def test_integer_keys(data_regression):
+    """Test that integer keys are supported in data dictionaries."""
+    contents = {
+        1: "first",
+        2: "second",
+        10: "tenth",
+        100: "hundredth",
+    }
+    data_regression.check(contents)
+
+
 def test_custom_object(data_regression):
     """Basic example where we register a custom conversion to dump objects"""
 
diff --git a/tests/test_data_regression/test_integer_keys.yml b/tests/test_data_regression/test_integer_keys.yml
new file mode 100644
index 0000000..666d4c2
--- /dev/null
+++ b/tests/test_data_regression/test_integer_keys.yml
@@ -0,0 +1,4 @@
+1: first
+2: second
+10: tenth
+100: hundredth