diff --git a/poetry/console/commands/lock.py b/poetry/console/commands/lock.py
index ddedb055d87..4157c02c5cc 100644
--- a/poetry/console/commands/lock.py
+++ b/poetry/console/commands/lock.py
@@ -1,3 +1,5 @@
+from cleo import option
+
 from .installer_command import InstallerCommand
 
 
@@ -6,6 +8,12 @@ class LockCommand(InstallerCommand):
     name = "lock"
     description = "Locks the project dependencies."
 
+    options = [
+        option(
+            "no-update", None, "Do not update locked versions, only refresh lock file."
+        ),
+    ]
+
     help = """
 The <info>lock</info> command reads the <comment>pyproject.toml</> file from the
 current directory, processes it, and locks the dependencies in the <comment>poetry.lock</>
@@ -21,6 +29,6 @@ def handle(self):
             self.poetry.config.get("experimental.new-installer", False)
         )
 
-        self._installer.lock()
+        self._installer.lock(update=not self.option("no-update"))
 
         return self._installer.run()
diff --git a/poetry/installation/installer.py b/poetry/installation/installer.py
index f0c9a62d65d..6956ae85fde 100644
--- a/poetry/installation/installer.py
+++ b/poetry/installation/installer.py
@@ -85,6 +85,10 @@ def set_locker(self, locker):  # type: (Locker) -> Installer
         return self
 
     def run(self):
+        # Check if refresh
+        if not self._update and self._lock and self._locker.is_locked():
+            return self._do_refresh()
+
         # Force update if there is no lock file present
         if not self._update and not self._locker.is_locked():
             self._update = True
@@ -137,11 +141,11 @@ def update(self, update=True):  # type: (bool) -> Installer
 
         return self
 
-    def lock(self):  # type: () -> Installer
+    def lock(self, update=True):  # type: (bool) -> Installer
         """
         Prepare the installer for locking only.
         """
-        self.update()
+        self.update(update=update)
         self.execute_operations(False)
         self._lock = True
 
@@ -173,6 +177,20 @@ def use_executor(self, use_executor=True):  # type: (bool) -> Installer
 
         return self
 
+    def _do_refresh(self):
+        # Checking extras
+        for extra in self._extras:
+            if extra not in self._package.extras:
+                raise ValueError("Extra [{}] is not specified.".format(extra))
+
+        ops = self._get_operations_from_lock(self._locker.locked_repository(True))
+        local_repo = Repository()
+        self._populate_local_repo(local_repo, ops)
+
+        self._write_lock_file(local_repo, force=True)
+
+        return 0
+
     def _do_install(self, local_repo):
         from poetry.puzzle import Solver
 
@@ -285,8 +303,8 @@ def _do_install(self, local_repo):
         # Execute operations
         return self._execute(ops)
 
-    def _write_lock_file(self, repo):  # type: (Repository) -> None
-        if self._update and self._write_lock:
+    def _write_lock_file(self, repo, force=True):  # type: (Repository, bool) -> None
+        if force or (self._update and self._write_lock):
             updated_lock = self._locker.set_lock_data(self._package, repo.packages)
 
             if updated_lock:
diff --git a/tests/installation/fixtures/old-lock-refresh.test b/tests/installation/fixtures/old-lock-refresh.test
new file mode 100644
index 00000000000..40e46ebdd3c
--- /dev/null
+++ b/tests/installation/fixtures/old-lock-refresh.test
@@ -0,0 +1,119 @@
+[[package]]
+name = "attrs"
+version = "17.4.0"
+description = "Classes Without Boilerplate"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.extras]
+dev = ["coverage", "hypothesis", "pympler", "pytest", "six", "zope.interface", "sphinx", "zope.interface"]
+docs = ["sphinx", "zope.interface"]
+tests = ["coverage", "hypothesis", "pympler", "pytest", "six", "zope.interface"]
+
+[[package]]
+name = "colorama"
+version = "0.3.9"
+description = "Cross-platform colored terminal text."
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "funcsigs"
+version = "1.0.2"
+description = "Python function signatures from PEP362 for Python 2.6, 2.7 and 3.2+"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "more-itertools"
+version = "4.1.0"
+description = "More routines for operating on iterables, beyond itertools"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+six = ">=1.0.0,<2.0.0"
+
+[[package]]
+name = "pluggy"
+version = "0.6.0"
+description = "plugin and hook calling mechanisms for python"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[[package]]
+name = "py"
+version = "1.5.3"
+description = "library with cross-python path, ini-parsing, io, code, log facilities"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[[package]]
+name = "pytest"
+version = "3.5.0"
+description = "pytest: simple powerful testing with Python"
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[package.dependencies]
+attrs = ">=17.4.0"
+colorama = "*"
+funcsigs = {version = "*", markers = "python_version < \"3.0\""}
+more-itertools = ">=4.0.0"
+pluggy = ">=0.5,<0.7"
+py = ">=1.5.0"
+six = ">=1.10.0"
+
+[[package]]
+name = "six"
+version = "1.11.0"
+description = "Python 2 and 3 compatibility utilities"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[metadata]
+lock-version = "1.1"
+python-versions = "*"
+content-hash = "123456789"
+
+[metadata.files]
+attrs = [
+    {file = "attrs-17.4.0-py2.py3-none-any.whl", hash = "sha256:a17a9573a6f475c99b551c0e0a812707ddda1ec9653bed04c13841404ed6f450"},
+    {file = "attrs-17.4.0.tar.gz", hash = "sha256:1c7960ccfd6a005cd9f7ba884e6316b5e430a3f1a6c37c5f87d8b43f83b54ec9"},
+]
+colorama = [
+    {file = "colorama-0.3.9-py2.py3-none-any.whl", hash = "sha256:463f8483208e921368c9f306094eb6f725c6ca42b0f97e313cb5d5512459feda"},
+    {file = "colorama-0.3.9.tar.gz", hash = "sha256:48eb22f4f8461b1df5734a074b57042430fb06e1d61bd1e11b078c0fe6d7a1f1"},
+]
+funcsigs = [
+    {file = "funcsigs-1.0.2-py2.py3-none-any.whl", hash = "sha256:330cc27ccbf7f1e992e69fef78261dc7c6569012cf397db8d3de0234e6c937ca"},
+    {file = "funcsigs-1.0.2.tar.gz", hash = "sha256:a7bb0f2cf3a3fd1ab2732cb49eba4252c2af4240442415b4abce3b87022a8f50"},
+]
+more-itertools = [
+    {file = "more-itertools-4.1.0.tar.gz", hash = "sha256:c9ce7eccdcb901a2c75d326ea134e0886abfbea5f93e91cc95de9507c0816c44"},
+    {file = "more_itertools-4.1.0-py2-none-any.whl", hash = "sha256:11a625025954c20145b37ff6309cd54e39ca94f72f6bb9576d1195db6fa2442e"},
+    {file = "more_itertools-4.1.0-py3-none-any.whl", hash = "sha256:0dd8f72eeab0d2c3bd489025bb2f6a1b8342f9b198f6fc37b52d15cfa4531fea"},
+]
+pluggy = [
+    {file = "pluggy-0.6.0.tar.gz", hash = "sha256:7f8ae7f5bdf75671a718d2daf0a64b7885f74510bcd98b1a0bb420eb9a9d0cff"},
+]
+py = [
+    {file = "py-1.5.3-py2.py3-none-any.whl", hash = "sha256:983f77f3331356039fdd792e9220b7b8ee1aa6bd2b25f567a963ff1de5a64f6a"},
+    {file = "py-1.5.3.tar.gz", hash = "sha256:29c9fab495d7528e80ba1e343b958684f4ace687327e6f789a94bf3d1915f881"},
+]
+pytest = [
+    {file = "pytest-3.5.0-py2.py3-none-any.whl", hash = "sha256:6266f87ab64692112e5477eba395cfedda53b1933ccd29478e671e73b420c19c"},
+    {file = "pytest-3.5.0.tar.gz", hash = "sha256:fae491d1874f199537fd5872b5e1f0e74a009b979df9d53d1553fd03da1703e1"},
+]
+six = [
+    {file = "six-1.11.0-py2.py3-none-any.whl", hash = "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb"},
+    {file = "six-1.11.0.tar.gz", hash = "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9"},
+]
diff --git a/tests/installation/test_installer.py b/tests/installation/test_installer.py
index 077f6dcab40..95f98dad185 100644
--- a/tests/installation/test_installer.py
+++ b/tests/installation/test_installer.py
@@ -1772,6 +1772,44 @@ def test_installer_uses_prereleases_if_they_are_compatible(
     assert 2 == installer.executor.installations_count
 
 
+def test_installer_can_refresh_old_lock_files(locker, package, repo, installed, config):
+    pool = Pool()
+    pool.add_repository(repo)
+
+    locker.locked(True)
+    locker.mock_lock_data(fixture("old-lock"))
+
+    for pkg in locker.locked_repository(with_dev_reqs=True).packages:
+        dependency = Factory.create_dependency(
+            name=pkg.name,
+            constraint=pkg.to_dependency().constraint,
+            category=pkg.category,
+        )
+        package.add_dependency(dependency)
+        repo.add_package(pkg)
+
+    installer = Installer(
+        NullIO(),
+        MockEnv(),
+        package,
+        locker,
+        pool,
+        config,
+        installed=None,
+        executor=Executor(MockEnv(), pool, config, NullIO()),
+    )
+    installer.use_executor()
+
+    installer.lock(update=False)
+    installer.run()
+
+    assert 0 == installer.executor.installations_count
+    assert 0 == installer.executor.updates_count
+    assert 0 == installer.executor.removals_count
+
+    assert locker.written_data == fixture("old-lock-refresh")
+
+
 def test_installer_can_handle_old_lock_files(
     installer, locker, package, repo, installed, config
 ):