diff --git a/docs/docs/configuration.md b/docs/docs/configuration.md
index 8bbff2ee1ba..87c5232f4be 100644
--- a/docs/docs/configuration.md
+++ b/docs/docs/configuration.md
@@ -108,7 +108,7 @@ Create a new virtual environment if one doesn't already exist.
 Defaults to `true`.
 
 !!!note:
-        When setting this configuration to `false`, the Python environment used must have `pip` 
+        When setting this configuration to `false`, the Python environment used must have `pip`
         installed and available.
 
 ### `virtualenvs.in-project`: boolean
diff --git a/poetry.lock b/poetry.lock
index cca9e6bdf05..973733a6d61 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -552,7 +552,7 @@ dev = ["pre-commit", "tox"]
 
 [[package]]
 name = "poetry-core"
-version = "1.0.0rc3"
+version = "1.0.0"
 description = "Poetry PEP 517 Build Backend"
 category = "main"
 optional = false
@@ -974,7 +974,7 @@ testing = ["pathlib2", "unittest2", "jaraco.itertools", "func-timeout"]
 [metadata]
 lock-version = "1.1"
 python-versions = "~2.7 || ^3.5"
-content-hash = "d97a19b321b206d7098b165c7285e3a3db28c3ae9b6a17349dd51b605a55223b"
+content-hash = "1e774c9d8b7f6812d721cff08b51554f9a0cd051e2ae0e884421bcb56718d131"
 
 [metadata.files]
 appdirs = [
@@ -1270,8 +1270,8 @@ pluggy = [
     {file = "pluggy-0.13.1.tar.gz", hash = "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0"},
 ]
 poetry-core = [
-    {file = "poetry-core-1.0.0rc3.tar.gz", hash = "sha256:0e3d23a4c5acc14c5f1703b12645692bf24461c8c8e3fff32ca80a5462beccdf"},
-    {file = "poetry_core-1.0.0rc3-py2.py3-none-any.whl", hash = "sha256:2c9ee2b3f7b40047bafdc2239fbb9de73637edc07a9697a3a66ac15fe6b040f5"},
+    {file = "poetry-core-1.0.0.tar.gz", hash = "sha256:6a664ff389b9f45382536f8fa1611a0cb4d2de7c5a5c885db1f0c600cd11fbd5"},
+    {file = "poetry_core-1.0.0-py2.py3-none-any.whl", hash = "sha256:769288e0e1b88dfcceb3185728f0b7388b26d5f93d6c22d2dcae372da51d200d"},
 ]
 pre-commit = [
     {file = "pre_commit-2.7.1-py2.py3-none-any.whl", hash = "sha256:810aef2a2ba4f31eed1941fc270e72696a1ad5590b9751839c90807d0fff6b9a"},
diff --git a/poetry/console/commands/init.py b/poetry/console/commands/init.py
index 8f96b12ca18..d6817bee975 100644
--- a/poetry/console/commands/init.py
+++ b/poetry/console/commands/init.py
@@ -209,7 +209,7 @@ def handle(self):
             dev_dependencies=dev_requirements,
         )
 
-        content = layout_.generate_poetry_content(pyproject)
+        content = layout_.generate_poetry_content(original=pyproject)
         if self.io.is_interactive():
             self.line("<info>Generated file</info>")
             self.line("")
diff --git a/poetry/layouts/layout.py b/poetry/layouts/layout.py
index 1d0feccc224..62985d63467 100644
--- a/poetry/layouts/layout.py
+++ b/poetry/layouts/layout.py
@@ -1,4 +1,5 @@
 from typing import TYPE_CHECKING
+from typing import Optional
 
 from tomlkit import dumps
 from tomlkit import loads
@@ -86,7 +87,9 @@ def create(self, path, with_tests=True):
 
         self._write_poetry(path)
 
-    def generate_poetry_content(self, original_toml):  # type: ("PyProjectTOML") -> str
+    def generate_poetry_content(
+        self, original=None
+    ):  # type: (Optional["PyProjectTOML"]) -> str
         template = POETRY_DEFAULT
         if self._license:
             template = POETRY_WITH_LICENSE
@@ -121,8 +124,8 @@ def generate_poetry_content(self, original_toml):  # type: ("PyProjectTOML") ->
 
         content = dumps(content)
 
-        if original_toml.file.exists():
-            content = dumps(original_toml.data) + "\n" + content
+        if original and original.file.exists():
+            content = dumps(original.data) + "\n" + content
 
         return content
 
diff --git a/pyproject.toml b/pyproject.toml
index a851e086588..dcdcc905848 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ classifiers = [
 [tool.poetry.dependencies]
 python = "~2.7 || ^3.5"
 
-poetry-core = "^1.0.0rc3"
+poetry-core = "^1.0.0"
 cleo = "^0.8.1"
 clikit = "^0.6.2"
 crashtest = { version = "^0.3.0", python = "^3.6" }
@@ -77,7 +77,7 @@ poetry = "poetry.console:main"
 
 
 [build-system]
-requires = ["poetry-core>=1.0.0a3"]
+requires = ["poetry-core>=1.0.0"]
 build-backend = "poetry.core.masonry.api"