diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index e2a4f31..16f20ae 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -26,7 +26,7 @@ jobs:
     strategy:
       matrix:
         python-version: [3.11]
-        poetry-version: [1.7.1]
+        poetry-version: [1.8.1]
     steps:
       - uses: actions/checkout@v4
       - name: Setup poetry
@@ -53,7 +53,7 @@ jobs:
     strategy:
       matrix:
         python-version: [3.11]
-        poetry-version: [1.7.1]
+        poetry-version: [1.8.1]
     steps:
       - uses: actions/checkout@v4
       - name: Setup poetry
diff --git a/pyproject.toml b/pyproject.toml
index 4591acc..11134d9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,6 +4,7 @@ version = "0.1.0"
 description = ""
 authors = ["Manabu Niseki <manabu.niseki@gmail.com>"]
 license = "MIT"
+package-mode = false
 
 [tool.poetry.dependencies]
 python = "^3.11"
diff --git a/requirements.txt b/requirements.txt
index 40f7452..9596402 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-poetry==1.7.1
+poetry==1.8.1