diff --git a/.github/workflows/setup.yml b/.github/workflows/setup.yml
index f0af503..01f64dd 100644
--- a/.github/workflows/setup.yml
+++ b/.github/workflows/setup.yml
@@ -27,7 +27,7 @@ jobs:
           fi
       - name: Install poetry
         if: steps.check_fresh.outputs.is_fresh == 'true'
-        run: pipx install poetry
+        run: pipx install poetry==1.8
       - name: Example setup step
         if: steps.check_fresh.outputs.is_fresh == 'true'
         run: |
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 3546894..0c157b3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,7 +12,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Install poetry
-        run: pipx install poetry
+        run: pipx install poetry==1.8
       - name: test
         uses: ./.github/start-server
       - uses: actions/upload-artifact@v4
@@ -27,7 +27,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Install poetry
         run: |
-          pipx install poetry
+          pipx install poetry==1.8
           make poetry.lock
       - uses: actions/setup-python@v5
         with:
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index 7c31a5d..f2b7697 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -21,7 +21,7 @@ jobs:
           token: ${{ secrets.GH_PAT }}
       - name: Install poetry
         run: |
-          pipx install poetry
+          pipx install poetry==1.8
           make poetry.lock
       - uses: actions/setup-python@v5
         with:
@@ -55,7 +55,7 @@ jobs:
           token: ${{ secrets.GH_PAT }}
       - name: Install poetry
         run: |
-          pipx install poetry
+          pipx install poetry==1.8
           make poetry.lock
       - name: Syncing fork with upstream
         run: |
diff --git a/Dockerfile b/Dockerfile
index 49fee6c..f4f9ae0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 ARG EIDOLON_VERSION=0.1.184
 FROM python:3.11-slim AS builder
-RUN pip install poetry
+RUN pip install poetry==1.8
 RUN poetry config virtualenvs.create false --local
 COPY pyproject.toml pyproject.toml
 RUN poetry remove --lock eidolon-ai-sdk
diff --git a/pyproject.toml b/pyproject.toml
index 647dfca..147a9e8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,5 +21,5 @@ chromadb = "^0.5.15"
 asyncio_mode = "auto"
 
 [build-system]
-requires = ["poetry-core"]
+requires = ["poetry-core>=1.0.0,<2.0.0"]
 build-backend = "poetry.core.masonry.api"