diff --git a/poetry.lock b/poetry.lock
index 83b92c1..ec9e6a0 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1301,4 +1301,4 @@ type = ["pytest-mypy"]
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.9"
-content-hash = "455ea15048e67a493a4b340275ee65bba410a0c34c922d29ab61843b26d520ab"
+content-hash = "f7d993fbbc752b732cfbfdc4fa0ea97d4790a3834fa56ff4110fac1feabd2e66"
diff --git a/pyproject.toml b/pyproject.toml
index d4dee62..8975e22 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -49,7 +49,7 @@ pytest = ">=7,<9"
 pytest-cov = ">=3,<7"
 pytest-asyncio = ">=0.19,<0.26"
 pycairo = "^1.21.0"
-PyGObject = {version = ">=3.50,<3.51", python = ">=3.9,<4"}
+PyGObject = {version = ">=3.50,<3.51", python = "<4"}
 Cython = ">=3,<3.1.0"
 setuptools = ">=65.4.1,<77.0.0"
 pytest-timeout = "^2.1.0"