diff --git a/edx_lint/__init__.py b/edx_lint/__init__.py
index a59c6721..6192f130 100644
--- a/edx_lint/__init__.py
+++ b/edx_lint/__init__.py
@@ -2,4 +2,4 @@
 edx_lint standardizes lint configuration and additional plugins for use in
 Open edX code.
 """
-__version__ = "6.0.0"
+__version__ = "6.1.0"
diff --git a/edx_lint/cmd/main.py b/edx_lint/cmd/main.py
index 1874914f..a688b93f 100644
--- a/edx_lint/cmd/main.py
+++ b/edx_lint/cmd/main.py
@@ -7,6 +7,7 @@
 from edx_lint.cmd.list import list_main
 from edx_lint.cmd.write import write_main
 from edx_lint.cmd.update import update_main
+from edx_lint.cmd.write_uv_constraints import write_uv_constraints_main
 
 
 def main(argv=None):
@@ -25,6 +26,8 @@ def main(argv=None):
         return write_main(argv[1:])
     elif argv[0] == "update":
         return update_main(argv[1:])
+    elif argv[0] == "write_uv_constraints":
+        return write_uv_constraints_main(argv[1:])
     else:
         print("Don't understand {!r}".format(" ".join(argv)))
         show_help()
@@ -40,5 +43,5 @@ def show_help():
 Commands:
 """.format(VERSION=__version__)
     )
-    for cmd in [write_main, check_main, list_main, update_main]:
+    for cmd in [write_main, check_main, list_main, update_main, write_uv_constraints_main]:
         print(cmd.__doc__.lstrip("\n"))
diff --git a/edx_lint/cmd/write_uv_constraints.py b/edx_lint/cmd/write_uv_constraints.py
new file mode 100644
index 00000000..11c8f573
--- /dev/null
+++ b/edx_lint/cmd/write_uv_constraints.py
@@ -0,0 +1,107 @@
+"""The edx_lint write_uv_constraints command."""
+
+import argparse
+import importlib.resources
+import re
+
+import tomlkit
+
+
+def _package_name(spec):
+    """Return the normalized package name from a constraint specifier like 'Django<6.0'."""
+    name = re.split(r"[<>=!~\[;@]", spec, maxsplit=1)[0].strip()
+    return name.lower().replace("-", "_").replace(".", "_")
+
+
+def _parse_constraints(text):
+    """Parse constraints file text, stripping comments and blank lines.
+
+    Returns a tuple of (constraints, directives) where:
+      constraints: valid package-specifier lines
+      directives:  pip directive lines (-c, -r, etc.) that are not valid here
+    """
+    constraints = []
+    directives = []
+    for line in text.splitlines():
+        line = line.split("#")[0].strip()
+        if not line:
+            continue
+        if line.startswith("-"):
+            directives.append(line)
+        else:
+            constraints.append(line)
+    return constraints, directives
+
+
+def write_uv_constraints_main(argv):
+    """
+    write_uv_constraints [pyproject.toml]
+        Write [tool.uv].constraint-dependencies in pyproject.toml by merging
+        edx-lint's global constraints with optional repo-specific constraints
+        from [tool.edx_lint].uv_constraints in the same file.
+    """
+    parser = argparse.ArgumentParser(prog="edx_lint write_uv_constraints", add_help=False)
+    parser.add_argument("pyproject", nargs="?", default="pyproject.toml")
+    args, unknown = parser.parse_known_args(argv)
+
+    if unknown:
+        print(f"Unknown arguments: {' '.join(unknown)}")
+        return 1
+
+    global_text = (
+        importlib.resources.files("edx_lint")
+        .joinpath("files/common_constraints.txt")
+        .read_text(encoding="utf-8")
+    )
+    global_constraints, _ = _parse_constraints(global_text)
+
+    try:
+        with open(args.pyproject, encoding="utf-8") as f:
+            data = tomlkit.load(f)
+    except FileNotFoundError:
+        print(f"File not found: {args.pyproject}")
+        return 2
+
+    # Read optional repo-specific constraints from [tool.edx_lint].uv_constraints.
+    # These live in the same pyproject.toml so everything is in one place.
+    try:
+        local_constraints = list(data["tool"]["edx_lint"]["uv_constraints"])
+    except KeyError:
+        local_constraints = []
+
+    # Merge global and local constraints, keyed by normalized package name so
+    # that a local entry for the same package overrides the global one.  This
+    # lets repos tighten or pin a constraint during testing without the global
+    # version clobbering their pin.
+    merged = {_package_name(c): c for c in global_constraints}
+    for c in local_constraints:
+        merged[_package_name(c)] = c  # local takes precedence
+    constraints = list(merged.values())
+
+    if "tool" not in data:
+        data.add("tool", tomlkit.table())
+    if "uv" not in data["tool"]:
+        data["tool"].add("uv", tomlkit.table())
+
+    uv_table = data["tool"]["uv"]
+    constraint_array = tomlkit.array()
+    constraint_array.multiline(True)
+    constraint_array.extend(constraints)
+
+    if "constraint-dependencies" in uv_table:
+        # Replace in-place so any existing comment above the key is preserved.
+        uv_table["constraint-dependencies"] = constraint_array
+    else:
+        # First write: add a prominent comment so humans know not to edit this.
+        uv_table.add(tomlkit.comment(" DO NOT EDIT constraint-dependencies DIRECTLY."))
+        uv_table.add(tomlkit.comment(" This list is managed by `edx_lint write_uv_constraints`"))
+        uv_table.add(tomlkit.comment(" and will be overwritten the next time `make upgrade` is run."))
+        uv_table.add(tomlkit.comment(" - GLOBAL constraints: edit edx_lint/files/common_constraints.txt"))
+        uv_table.add(tomlkit.comment(" - REPO-SPECIFIC constraints: edit [tool.edx_lint].uv_constraints in this file"))
+        uv_table.add("constraint-dependencies", constraint_array)
+
+    with open(args.pyproject, "w", encoding="utf-8") as f:
+        tomlkit.dump(data, f)
+
+    print(f"Wrote {len(constraints)} constraints to {args.pyproject}")
+    return 0
diff --git a/requirements/base.in b/requirements/base.in
index 7e6238a8..c44cb087 100644
--- a/requirements/base.in
+++ b/requirements/base.in
@@ -7,3 +7,4 @@ pylint
 pylint-django
 pylint-celery
 six
+tomlkit
diff --git a/requirements/base.txt b/requirements/base.txt
index 42c5cca7..68caaab9 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -8,14 +8,14 @@ astroid==4.0.4
     # via
     #   pylint
     #   pylint-celery
-click==8.3.1
+click==8.3.3
     # via
     #   -r requirements/base.in
     #   click-log
     #   code-annotations
 click-log==0.4.0
     # via -r requirements/base.in
-code-annotations==2.3.2
+code-annotations==3.0.0
     # via
     #   -c requirements/constraints.txt
     #   -r requirements/base.in
@@ -29,7 +29,7 @@ markupsafe==3.0.3
     # via jinja2
 mccabe==0.7.0
     # via pylint
-platformdirs==4.9.4
+platformdirs==4.9.6
     # via pylint
 pylint==4.0.5
     # via
@@ -56,4 +56,6 @@ stevedore==5.7.0
 text-unidecode==1.3
     # via python-slugify
 tomlkit==0.14.0
-    # via pylint
+    # via
+    #   -r requirements/base.in
+    #   pylint
diff --git a/requirements/ci.txt b/requirements/ci.txt
index 8e347215..441e26a3 100644
--- a/requirements/ci.txt
+++ b/requirements/ci.txt
@@ -4,22 +4,22 @@
 #
 #    make upgrade
 #
-cachetools==7.0.3
+cachetools==7.0.6
     # via tox
 colorama==0.4.6
     # via tox
 distlib==0.4.0
     # via virtualenv
-filelock==3.25.0
+filelock==3.29.0
     # via
     #   python-discovery
     #   tox
     #   virtualenv
-packaging==26.0
+packaging==26.1
     # via
     #   pyproject-api
     #   tox
-platformdirs==4.9.4
+platformdirs==4.9.6
     # via
     #   python-discovery
     #   tox
@@ -28,11 +28,13 @@ pluggy==1.6.0
     # via tox
 pyproject-api==1.10.0
     # via tox
-python-discovery==1.1.0
-    # via virtualenv
+python-discovery==1.2.2
+    # via
+    #   tox
+    #   virtualenv
 tomli-w==1.2.0
     # via tox
-tox==4.49.0
+tox==4.53.0
     # via -r requirements/ci.in
-virtualenv==21.1.0
+virtualenv==21.2.4
     # via tox
diff --git a/requirements/dev.txt b/requirements/dev.txt
index 59945b6f..4cd20139 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -9,14 +9,14 @@ astroid==4.0.4
     #   -r requirements/base.txt
     #   pylint
     #   pylint-celery
-click==8.3.1
+click==8.3.3
     # via
     #   -r requirements/base.txt
     #   click-log
     #   code-annotations
 click-log==0.4.0
     # via -r requirements/base.txt
-code-annotations==2.3.2
+code-annotations==3.0.0
     # via
     #   -c requirements/constraints.txt
     #   -r requirements/base.txt
@@ -26,7 +26,7 @@ dill==0.4.1
     #   pylint
 distlib==0.4.0
     # via virtualenv
-filelock==3.25.0
+filelock==3.29.0
     # via
     #   python-discovery
     #   tox
@@ -47,11 +47,11 @@ mccabe==0.7.0
     # via
     #   -r requirements/base.txt
     #   pylint
-packaging==26.0
+packaging==26.1
     # via
     #   pyproject-api
     #   tox
-platformdirs==4.9.4
+platformdirs==4.9.6
     # via
     #   -r requirements/base.txt
     #   pylint
@@ -76,8 +76,10 @@ pylint-plugin-utils==0.9.0
     #   -r requirements/base.txt
     #   pylint-celery
     #   pylint-django
-python-discovery==1.1.0
-    # via virtualenv
+python-discovery==1.2.2
+    # via
+    #   tox
+    #   virtualenv
 python-slugify==8.0.4
     # via
     #   -r requirements/base.txt
@@ -108,5 +110,5 @@ tox==3.28.0
     #   tox-battery
 tox-battery==0.6.2
     # via -r requirements/dev.in
-virtualenv==21.1.0
+virtualenv==21.2.4
     # via tox
diff --git a/requirements/pip-tools.txt b/requirements/pip-tools.txt
index ce8dc38f..89086ac7 100644
--- a/requirements/pip-tools.txt
+++ b/requirements/pip-tools.txt
@@ -4,11 +4,11 @@
 #
 #    make upgrade
 #
-build==1.4.0
+build==1.4.4
     # via pip-tools
-click==8.3.1
+click==8.3.3
     # via pip-tools
-packaging==26.0
+packaging==26.1
     # via
     #   build
     #   wheel
@@ -18,11 +18,11 @@ pyproject-hooks==1.2.0
     # via
     #   build
     #   pip-tools
-wheel==0.46.3
+wheel==0.47.0
     # via pip-tools
 
 # The following packages are considered to be unsafe in a requirements file:
 pip==26.0.1
     # via pip-tools
-setuptools==82.0.0
+setuptools==82.0.1
     # via pip-tools
diff --git a/requirements/test.txt b/requirements/test.txt
index 2a36e80d..7fd67aec 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -11,18 +11,18 @@ astroid==4.0.4
     #   -r requirements/dev.txt
     #   pylint
     #   pylint-celery
-click==8.3.1
+click==8.3.3
     # via
     #   -r requirements/dev.txt
     #   click-log
     #   code-annotations
 click-log==0.4.0
     # via -r requirements/dev.txt
-code-annotations==2.3.2
+code-annotations==3.0.0
     # via
     #   -c requirements/constraints.txt
     #   -r requirements/dev.txt
-coverage==7.13.4
+coverage==7.13.5
     # via -r requirements/test.in
 dill==0.4.1
     # via
@@ -35,7 +35,7 @@ distlib==0.4.0
     # via
     #   -c edx_lint/files/common_constraints.txt
     #   -r requirements/test.in
-filelock==3.25.0
+filelock==3.29.0
     # via
     #   -r requirements/dev.txt
     #   python-discovery
@@ -59,12 +59,12 @@ mccabe==0.7.0
     # via
     #   -r requirements/dev.txt
     #   pylint
-packaging==26.0
+packaging==26.1
     # via
     #   -r requirements/dev.txt
     #   pytest
     #   tox
-platformdirs==4.9.4
+platformdirs==4.9.6
     # via
     #   -r requirements/dev.txt
     #   pylint
@@ -79,7 +79,7 @@ py==1.11.0
     # via
     #   -r requirements/dev.txt
     #   tox
-pygments==2.19.2
+pygments==2.20.0
     # via pytest
 pylint==4.0.5
     # via
@@ -96,9 +96,9 @@ pylint-plugin-utils==0.9.0
     #   -r requirements/dev.txt
     #   pylint-celery
     #   pylint-django
-pytest==9.0.2
+pytest==9.0.3
     # via -r requirements/test.in
-python-discovery==1.1.0
+python-discovery==1.2.2
     # via
     #   -r requirements/dev.txt
     #   virtualenv
@@ -134,7 +134,7 @@ tox==3.28.0
     #   tox-battery
 tox-battery==0.6.2
     # via -r requirements/dev.txt
-virtualenv==21.1.0
+virtualenv==21.2.4
     # via
     #   -r requirements/dev.txt
     #   tox
diff --git a/test/test_cmd.py b/test/test_cmd.py
index 4fa88d6b..be861dc4 100644
--- a/test/test_cmd.py
+++ b/test/test_cmd.py
@@ -1,6 +1,7 @@
 """ Tests for the command line executable. """
 
 import contextlib
+import importlib.resources
 import io
 import os
 import shutil
@@ -8,7 +9,10 @@
 import unittest
 from unittest.mock import patch
 
+import tomlkit
+
 from edx_lint.cmd import main
+from edx_lint.cmd.write_uv_constraints import _parse_constraints
 
 
 PYLINTRC = "pylintrc"
@@ -225,3 +229,100 @@ def test_cant_check_a_missing_file(self):
         with capture_output() as output:
             self.assertEqual(2, self.call_command(["check", "xyzzy.foo"]))
         self.assertEqual(output.getvalue(), "xyzzy.foo doesn't exist\n")
+
+
+PYPROJECT_MINIMAL = '[project]\nname = "test"\n'
+# Read the actual bundled constraints so tests stay in sync with the file automatically.
+_GLOBAL_CONSTRAINTS_TEXT = (
+    importlib.resources.files("edx_lint")
+    .joinpath("files/common_constraints.txt")
+    .read_text(encoding="utf-8")
+)
+GLOBAL_CONSTRAINTS, _ = _parse_constraints(_GLOBAL_CONSTRAINTS_TEXT)
+# Use the first entry as a representative value for presence checks.
+GLOBAL_CONSTRAINT = GLOBAL_CONSTRAINTS[0]
+
+
+class WriteUvConstraintsCommandTest(CommandTest):
+    """Tests for the write_uv_constraints command."""
+
+    def _make_pyproject(self, path="pyproject.toml", content=PYPROJECT_MINIMAL):
+        with open(path, "w") as f:
+            f.write(content)
+
+    def test_no_args_updates_default(self):
+        self._make_pyproject()
+        self.assertEqual(0, self.call_command(["write_uv_constraints"]))
+        self.assert_file("pyproject.toml", contains=GLOBAL_CONSTRAINT)
+
+    def test_explicit_pyproject_path(self):
+        self._make_pyproject("other.toml")
+        self.assertEqual(0, self.call_command(["write_uv_constraints", "other.toml"]))
+        self.assert_file("other.toml", contains=GLOBAL_CONSTRAINT)
+
+    def test_local_merges_global_and_local(self):
+        self._make_pyproject(
+            content=PYPROJECT_MINIMAL + '[tool.edx_lint]\nuv_constraints = ["mypackage<2.0"]\n'
+        )
+        assert self.call_command(["write_uv_constraints"]) == 0
+        written = self._read_constraint_dependencies()
+        assert GLOBAL_CONSTRAINT in written
+        assert "mypackage<2.0" in written
+
+    def test_idempotent(self):
+        self._make_pyproject()
+        self.assertEqual(0, self.call_command(["write_uv_constraints"]))
+        with open("pyproject.toml") as f:
+            first = f.read()
+        self.assertEqual(0, self.call_command(["write_uv_constraints"]))
+        with open("pyproject.toml") as f:
+            second = f.read()
+        self.assertEqual(first, second)
+
+    def test_preserves_existing_content(self):
+        self._make_pyproject(
+            content='[project]\nname = "myproject"\nversion = "1.0"\n\n[tool.ruff]\nline-length = 88\n'
+        )
+        self.assertEqual(0, self.call_command(["write_uv_constraints"]))
+        self.assert_file("pyproject.toml", contains='name = "myproject"')
+        self.assert_file("pyproject.toml", contains="line-length = 88")
+        self.assert_file("pyproject.toml", contains=GLOBAL_CONSTRAINT)
+
+    def test_missing_pyproject_returns_2(self):
+        # No pyproject.toml created in temp dir
+        with capture_output():
+            self.assertEqual(2, self.call_command(["write_uv_constraints"]))
+
+    def test_unknown_args_returns_nonzero(self):
+        self._make_pyproject()
+        ret = self.call_command(["write_uv_constraints", "--bogus-flag"])
+        self.assertNotEqual(0, ret)
+
+    def _read_constraint_dependencies(self, path="pyproject.toml"):
+        """Read [tool.uv].constraint-dependencies from a pyproject.toml."""
+        with open(path) as f:
+            data = tomlkit.load(f)
+        return list(data["tool"]["uv"]["constraint-dependencies"])
+
+    def test_local_overrides_global_for_same_package(self):
+        # Extract the package name from the first global constraint and write a
+        # stricter local version.  The local pin should win.
+        first_global = GLOBAL_CONSTRAINTS[0]
+        pkg = first_global.split("<")[0].split(">")[0].split("=")[0].split("!")[0].strip()
+        local_pin = f"{pkg}==0.0.1"
+        self._make_pyproject(
+            content=PYPROJECT_MINIMAL + f'[tool.edx_lint]\nuv_constraints = ["{local_pin}"]\n'
+        )
+        assert self.call_command(["write_uv_constraints"]) == 0
+        written = self._read_constraint_dependencies()
+        assert local_pin in written
+        assert first_global not in written
+
+    def test_deduplicates_exact_duplicates(self):
+        # Exact duplicate in [tool.edx_lint].uv_constraints should appear only once.
+        self._make_pyproject(
+            content=PYPROJECT_MINIMAL + f'[tool.edx_lint]\nuv_constraints = ["{GLOBAL_CONSTRAINTS[0]}"]\n'
+        )
+        assert self.call_command(["write_uv_constraints"]) == 0
+        written = self._read_constraint_dependencies()
+        assert written.count(GLOBAL_CONSTRAINTS[0]) == 1