diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 01c9df6..7f4fb83 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -33,6 +33,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           python -m pip install poetry
+          poetry lock --no-update
           poetry install
 
       - name: Run tests
diff --git a/.github/workflows/publish.yaml b/.github/workflows/publish.yaml
index 9a2facb..43fce96 100644
--- a/.github/workflows/publish.yaml
+++ b/.github/workflows/publish.yaml
@@ -21,6 +21,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           python -m pip install poetry
+          poetry lock --no-update
           poetry install
 
       - name: Build source distribution
@@ -54,6 +55,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           python -m pip install poetry
+          poetry lock --no-update
           poetry install
 
       - name: Run tests