diff --git a/.circleci/config.yml b/.circleci/config.yml
index 26b5644..0092751 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -6,9 +6,18 @@ jobs:
     - image: cimg/python:2.7
     environment:
       PYTHON_VERSION: "2.7"
-    working_directory: ~/repo
     steps: &test-steps
     - checkout
+    - run:
+        name: Patch poetry
+        command: |
+          # FIXME patch for https://github.com/python-poetry/poetry-core/pull/154
+          echo '7a8' > /tmp/patch
+          echo '> from poetry.core.semver import EmptyConstraint' >> /tmp/patch
+          echo '293a295,296' >> /tmp/patch
+          echo '>         elif isinstance(constraint, EmptyConstraint):' >> /tmp/patch
+          echo '>             marker = ""' >> /tmp/patch
+          patch "~/.poetry/lib/poetry/_vendor/py${PYTHON_VERSION}/poetry/core/packages/dependency.py" /tmp/patch
     - restore_cache:
         keys:
         - test-v1-{{ .Environment.PYTHON_VERSION }}-{{ checksum "pyproject.toml" }}-
@@ -37,7 +46,6 @@ jobs:
     - image: cimg/python:3.5
     environment:
       PYTHON_VERSION: "3.5"
-    working_directory: ~/repo
     steps: *test-steps
 
   test-py36:
@@ -45,7 +53,6 @@ jobs:
     - image: cimg/python:3.6
     environment:
       PYTHON_VERSION: "3.6"
-    working_directory: ~/repo
     steps: *test-steps
 
   test-py37:
@@ -53,7 +60,6 @@ jobs:
     - image: cimg/python:3.7
     environment:
       PYTHON_VERSION: "3.7"
-    working_directory: ~/repo
     steps: *test-steps
 
   test-py38:
@@ -61,7 +67,6 @@ jobs:
     - image: cimg/python:3.8
     environment:
       PYTHON_VERSION: "3.8"
-    working_directory: ~/repo
     steps: *test-steps
 
   test-py39:
@@ -69,7 +74,6 @@ jobs:
     - image: cimg/python:3.9
     environment:
       PYTHON_VERSION: "3.9"
-    working_directory: ~/repo
     steps: *test-steps
 
 workflows: