diff --git a/poetry.lock b/poetry.lock
index a247513..3f2b7b4 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1217,7 +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 = "348cc056cf92ab20a39e37d140d79d4e78cc74fa6e51e9102be48bad1f723885"
+content-hash = "4c2d8fe527ba354d4b29b68e68a8787898d265f25a25c6718b7fb28f4e4062cb"
 
 [metadata.files]
 alabaster = [
diff --git a/pyproject.toml b/pyproject.toml
index c91eca5..84f93a1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,6 @@ altair = "^4.1.0"
 Sphinx = "^3.5.1"
 sphinxcontrib-napoleon = "^0.7"
 pytest = "^6.2.2"
-altair = "^4.1.0"
 pytest-cov = "^2.11.1"
 python-semantic-release = "^7.15.0"
 nbsphinx = "^0.8.2"