diff --git a/src/poetry/packages/locker.py b/src/poetry/packages/locker.py
index 35a035f7535..5460031a820 100644
--- a/src/poetry/packages/locker.py
+++ b/src/poetry/packages/locker.py
@@ -409,13 +409,13 @@ def _dump_package(self, package: Package) -> dict[str, Any]:
 
         if package.extras:
             extras = {}
-            for name, deps in package.extras.items():
+            for name, deps in sorted(package.extras.items()):
                 # TODO: This should use dep.to_pep_508() once this is fixed
                 # https://github.com/python-poetry/poetry-core/pull/102
-                extras[name] = [
+                extras[name] = sorted(
                     dep.base_pep_508_name if not dep.constraint.is_any() else dep.name
                     for dep in deps
-                ]
+                )
 
             data["extras"] = extras
 
diff --git a/tests/installation/fixtures/with-pypi-repository.test b/tests/installation/fixtures/with-pypi-repository.test
index 27fee8ce755..ac57e43ec7b 100644
--- a/tests/installation/fixtures/with-pypi-repository.test
+++ b/tests/installation/fixtures/with-pypi-repository.test
@@ -7,7 +7,7 @@ optional = false
 python-versions = "*"
 
 [package.extras]
-dev = ["coverage", "hypothesis", "pympler", "pytest", "six", "zope-interface", "sphinx", "zope-interface"]
+dev = ["coverage", "hypothesis", "pympler", "pytest", "six", "sphinx", "zope-interface", "zope-interface"]
 docs = ["sphinx", "zope-interface"]
 tests = ["coverage", "hypothesis", "pympler", "pytest", "six", "zope-interface"]
 
@@ -72,14 +72,6 @@ pluggy = ">=0.5,<0.7"
 funcsigs = {"version" = "*", "markers" = "python_version < \"3.0\""}
 colorama = {"version" = "*", "markers" = "sys_platform == \"win32\""}
 
-[[package]]
-name = "six"
-version = "1.11.0"
-description = "Python 2 and 3 compatibility utilities"
-category = "dev"
-optional = false
-python-versions = "*"
-
 [[package]]
 name = "setuptools"
 version = "39.2.0"
@@ -92,6 +84,14 @@ python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*"
 certs = ["certifi (==2016.9.26)"]
 ssl = ["wincertstore (==0.2)"]
 
+[[package]]
+name = "six"
+version = "1.11.0"
+description = "Python 2 and 3 compatibility utilities"
+category = "dev"
+optional = false
+python-versions = "*"
+
 [metadata]
 python-versions = "*"
 lock-version = "1.1"
diff --git a/tests/installation/test_installer.py b/tests/installation/test_installer.py
index 2aee63d9701..452ff425da9 100644
--- a/tests/installation/test_installer.py
+++ b/tests/installation/test_installer.py
@@ -14,7 +14,6 @@
 from cleo.io.null_io import NullIO
 from cleo.io.outputs.buffered_output import BufferedOutput
 from cleo.io.outputs.output import Verbosity
-from deepdiff import DeepDiff
 from poetry.core.packages.dependency_group import MAIN_GROUP
 from poetry.core.packages.dependency_group import DependencyGroup
 from poetry.core.packages.package import Package
@@ -1164,7 +1163,7 @@ def test_installer_with_pypi_repository(
 
     expected = fixture("with-pypi-repository")
 
-    assert not DeepDiff(expected, locker.written_data, ignore_order=True)
+    assert expected == locker.written_data
 
 
 def test_run_installs_with_local_file(
diff --git a/tests/installation/test_installer_old.py b/tests/installation/test_installer_old.py
index cdf62563374..baa59649ce9 100644
--- a/tests/installation/test_installer_old.py
+++ b/tests/installation/test_installer_old.py
@@ -8,7 +8,6 @@
 import pytest
 
 from cleo.io.null_io import NullIO
-from deepdiff import DeepDiff
 from poetry.core.packages.project_package import ProjectPackage
 from poetry.core.toml.file import TOMLFile
 
@@ -833,7 +832,7 @@ def test_installer_with_pypi_repository(
 
     expected = fixture("with-pypi-repository")
 
-    assert not DeepDiff(expected, locker.written_data, ignore_order=True)
+    assert expected == locker.written_data
 
 
 def test_run_installs_with_local_file(
diff --git a/tests/packages/test_locker.py b/tests/packages/test_locker.py
index e0ed720bf94..f41fc2ba056 100644
--- a/tests/packages/test_locker.py
+++ b/tests/packages/test_locker.py
@@ -778,6 +778,51 @@ def test_locker_dumps_subdir(locker: Locker, root: ProjectPackage) -> None:
     assert content == expected
 
 
+def test_locker_dumps_dependency_extras_in_correct_order(
+    locker: Locker, root: ProjectPackage
+):
+    root_dir = Path(__file__).parent.parent.joinpath("fixtures")
+    package_a = get_package("A", "1.0.0")
+    Factory.create_dependency("B", "1.0.0", root_dir=root_dir)
+    Factory.create_dependency("C", "1.0.0", root_dir=root_dir)
+    package_first = Factory.create_dependency("first", "1.0.0", root_dir=root_dir)
+    package_second = Factory.create_dependency("second", "1.0.0", root_dir=root_dir)
+    package_third = Factory.create_dependency("third", "1.0.0", root_dir=root_dir)
+
+    package_a.extras = {
+        "C": [package_third, package_second, package_first],
+        "B": [package_first, package_second, package_third],
+    }
+
+    locker.set_lock_data(root, [package_a])
+
+    with locker.lock.open(encoding="utf-8") as f:
+        content = f.read()
+
+    expected = """[[package]]
+name = "A"
+version = "1.0.0"
+description = ""
+category = "main"
+optional = false
+python-versions = "*"
+
+[package.extras]
+B = ["first (==1.0.0)", "second (==1.0.0)", "third (==1.0.0)"]
+C = ["first (==1.0.0)", "second (==1.0.0)", "third (==1.0.0)"]
+
+[metadata]
+lock-version = "1.1"
+python-versions = "*"
+content-hash = "115cf985d932e9bf5f540555bbdd75decbb62cac81e399375fc19f6277f8c1d8"
+
+[metadata.files]
+A = []
+"""
+
+    assert content == expected
+
+
 def test_locked_repository_uses_root_dir_of_package(
     locker: Locker, mocker: MockerFixture
 ):