diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f25e9494..c18d5bf6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -141,7 +141,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: "Setup environment"
         run: |
-          pipx install poetry
+          pipx install poetry==1.8.5
           poetry config virtualenvs.prefer-active-python true
           pip install invoke toml codecov
       - name: "Install Package"
@@ -192,7 +192,7 @@ jobs:
           python-version: "3.12"
       - name: "Setup environment"
         run: |
-          pipx install poetry
+          pipx install poetry==1.8.5
           poetry config virtualenvs.prefer-active-python true
           pip install invoke toml codecov
       - name: "Install Package"