diff --git a/pyproject.toml b/pyproject.toml
index b06a30a..e3c0cd5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,6 +31,9 @@ dev = [
     "mcp>=1.0.0",
     "typer>=0.12.0",
     "rich>=14.0.0",
+    # tomllib is stdlib only on 3.11+; scripts/check_git_deps.py needs the
+    # backport to run under the 3.10 CI matrix leg.
+    "tomli>=2.0.0; python_version < '3.11'",
 ]
 
 [tool.pytest.ini_options]
diff --git a/scripts/check_git_deps.py b/scripts/check_git_deps.py
index e97d642..610817b 100644
--- a/scripts/check_git_deps.py
+++ b/scripts/check_git_deps.py
@@ -22,10 +22,14 @@
 from __future__ import annotations
 
 import sys
-import tomllib
 from pathlib import Path
 from typing import Any
 
+if sys.version_info >= (3, 11):
+    import tomllib
+else:  # tomllib is stdlib only on 3.11+; tomli is the drop-in backport
+    import tomli as tomllib
+
 GIT_MARKERS = ("git+", "git://")
 DEFAULT_PYPROJECT = "pyproject.toml"
 
diff --git a/uv.lock b/uv.lock
index de5affa..b5a3d75 100644
--- a/uv.lock
+++ b/uv.lock
@@ -3056,6 +3056,7 @@ dev = [
     { name = "pytest-xdist" },
     { name = "rich" },
     { name = "ruff" },
+    { name = "tomli", marker = "python_full_version < '3.11'" },
     { name = "typer" },
     { name = "types-requests" },
 ]
@@ -3085,6 +3086,7 @@ dev = [
     { name = "pytest-xdist", specifier = ">=3.5.0" },
     { name = "rich", specifier = ">=14.0.0" },
     { name = "ruff", specifier = ">=0.8.0" },
+    { name = "tomli", marker = "python_full_version < '3.11'", specifier = ">=2.0.0" },
     { name = "typer", specifier = ">=0.12.0" },
     { name = "types-requests", specifier = ">=2.25.0" },
 ]