diff --git a/poetry.lock b/poetry.lock
index c88456e..5afbb46 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -426,8 +426,8 @@ testing = ["coverage (>=4)", "coverage-enable-subprocess (>=1)", "flaky (>=3)",
 
 [metadata]
 lock-version = "1.1"
-python-versions = ">=3.8"
-content-hash = "ca49c4157e4eedcabc694d68bc73b69d02a2d2a25e0c3987bd1b9771872ac3e7"
+python-versions = ">=3.8,<4"
+content-hash = "3d4fcfc0be0a68eb969e9fbddeb4267e5a74b0fdfd9a1004bc928a893ccb37e8"
 
 [metadata.files]
 atomicwrites = [
diff --git a/pyproject.toml b/pyproject.toml
index 2ac1a0d..b25b4ac 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,7 +17,7 @@ classifiers = [
 ]
 
 [tool.poetry.dependencies]
-python = ">=3.8"
+python = ">=3.8,<4"
 "Mastodon.py" = ">=1.5.0"
 click = ">=7.0"
 pendulum = ">=2.0.5"