diff --git a/poetry.lock b/poetry.lock
index 01ae846..2153c62 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -22,7 +22,6 @@ numpy = "*"
 pandas = ">=0.18"
 toolz = "*"
 
-
 [package.extras]
 dev = ["black", "docutils", "ipython", "flake8", "pytest", "sphinx", "m2r", "vega-datasets", "recommonmark"]
 
@@ -1218,7 +1217,7 @@ testing = ["pytest (>=4.6)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pyt
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.8"
-content-hash = "4c2d8fe527ba354d4b29b68e68a8787898d265f25a25c6718b7fb28f4e4062cb"
+content-hash = "6ce357fb6738f02a9b7c6c01812b9fcc30b8df238a24814bf54fbc376dd87d78"
 
 [metadata.files]
 alabaster = [
diff --git a/pyproject.toml b/pyproject.toml
index 04c7995..938c9d2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,7 @@ license = "MIT"
 [tool.poetry.dependencies]
 python = "^3.8"
 pandas = "^1.2.2"
-altair = "^4.1.0"
+altair = "*"
 
 [tool.poetry.dev-dependencies]
 Sphinx = "^3.5.1"