diff --git a/poetry.lock b/poetry.lock
index 437f1cfe..f2d5a7da 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1299,11 +1299,11 @@ python-versions = ">=3.6"
 
 [[package]]
 name = "tomlkit"
-version = "0.7.2"
+version = "0.8.0"
 description = "Style preserving TOML library"
 category = "main"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+python-versions = ">=3.6,<4.0"
 
 [[package]]
 name = "tornado"
@@ -1417,7 +1417,7 @@ testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytes
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "418595de64e96752044d4e4aac2cad482be7043a8f316f68777e482c2ce18ee9"
+content-hash = "629dd68598e8b32fb872d1bc395d94fbfddc9ae869e17833e1b5245be27bc895"
 
 [metadata.files]
 alabaster = [
@@ -2140,8 +2140,8 @@ tomli = [
     {file = "tomli-1.2.3.tar.gz", hash = "sha256:05b6166bff487dc068d322585c7ea4ef78deed501cc124060e0f238e89a9231f"},
 ]
 tomlkit = [
-    {file = "tomlkit-0.7.2-py2.py3-none-any.whl", hash = "sha256:173ad840fa5d2aac140528ca1933c29791b79a374a0861a80347f42ec9328117"},
-    {file = "tomlkit-0.7.2.tar.gz", hash = "sha256:d7a454f319a7e9bd2e249f239168729327e4dd2d27b17dc68be264ad1ce36754"},
+    {file = "tomlkit-0.8.0-py3-none-any.whl", hash = "sha256:b824e3466f1d475b2b5f1c392954c6cb7ea04d64354ff7300dc7c14257dc85db"},
+    {file = "tomlkit-0.8.0.tar.gz", hash = "sha256:29e84a855712dfe0e88a48f6d05c21118dbafb283bb2eed614d46f80deb8e9a1"},
 ]
 tornado = [
     {file = "tornado-6.1-cp35-cp35m-macosx_10_9_x86_64.whl", hash = "sha256:d371e811d6b156d82aa5f9a4e08b58debf97c302a35714f6f45e35139c332e32"},
diff --git a/pyproject.toml b/pyproject.toml
index 38630908..d19a90ff 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ Changelog = "https://github.com/cjolowicz/nox-poetry/releases"
 [tool.poetry.dependencies]
 python = "^3.7"
 nox = ">=2020.8.22"
-tomlkit = "^0.7.0"
+tomlkit = ">=0.7,<0.9"
 packaging = ">=20.9"
 
 [tool.poetry.dev-dependencies]