diff --git a/benchmark/ope/poetry.lock b/benchmark/ope/poetry.lock
index 1e1e2045..2cdeacc4 100644
--- a/benchmark/ope/poetry.lock
+++ b/benchmark/ope/poetry.lock
@@ -170,11 +170,11 @@ python-versions = "*"
 
 [[package]]
 name = "numpy"
-version = "1.21.2"
+version = "1.22.0"
 description = "NumPy is the fundamental package for array computing with Python."
 category = "main"
 optional = false
-python-versions = ">=3.7,<3.11"
+python-versions = ">=3.8"
 
 [[package]]
 name = "obp"
@@ -575,7 +575,7 @@ viz = ["matplotlib", "seaborn", "nc-time-axis"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.9,<3.10"
-content-hash = "e57626b42f59924ac84762557a18ede55803bcd78a5c3bd688b60cad94f078d0"
+content-hash = "6b709aec3193a58c59a968e88504bc5bdbbbd60928977a58a33fe64f3568be8c"
 
 [metadata.files]
 antlr4-python3-runtime = [
@@ -702,36 +702,28 @@ mypy-extensions = [
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@@ -769,6 +761,7 @@ pandas = [
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 pathspec = [
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diff --git a/benchmark/ope/pyproject.toml b/benchmark/ope/pyproject.toml
index 7376722e..6a5c03d8 100644
--- a/benchmark/ope/pyproject.toml
+++ b/benchmark/ope/pyproject.toml
@@ -8,7 +8,7 @@ authors = ["usaito <ys552@cornell.edu>"]
 python = "^3.9,<3.10"
 scikit-learn = "^0.24.2"
 pandas = "^1.3.1"
-numpy = "^1.21.1"
+numpy = "^1.22.0"
 matplotlib = "^3.4.2"
 pingouin = "^0.4.0"
 pyieoe = "^0.1.0"