diff --git a/.circleci/config.yml b/.circleci/config.yml
index db83532dd5..45f49b8e25 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -80,25 +80,29 @@ jobs:
       - run:
           name: PyPI publish
           command: |
-            if [ -n "$(git diff --name-only $CIRCLE_SHA1^..$CIRCLE_SHA1 | grep 'pyproject.toml')" ]; then
-              echo "pyproject.toml modified"
-              echo -e "[pypi]\nusername = __token__\npassword = $PYPI_API_TOKEN" > ~/.pypirc
-              python -m pip install --upgrade pip
-              pip install build
-              pip install wheel
-              pip install --upgrade twine setuptools
-              rm -rf build dist
+            echo "Install TOML package."
+            python -m pip install toml
+            VERSION=$(python -c "import toml; print(toml.load('pyproject.toml')['tool']['poetry']['version'])")
+            PACKAGE_NAME=$(python -c "import toml; print(toml.load('pyproject.toml')['tool']['poetry']['name'])")
+            if ! pip show -v $PACKAGE_NAME | grep -q "Version: ${VERSION}"; then
+                echo "pyproject.toml modified"
+                echo -e "[pypi]\nusername = __token__\npassword = $PYPI_API_TOKEN" > ~/.pypirc
+                python -m pip install --upgrade pip
+                pip install build
+                pip install wheel
+                pip install --upgrade twine setuptools
+                rm -rf build dist
 
-              echo "Building package"
-              python -m build
+                echo "Building package"
+                python -m build
 
-              echo "Twine upload to dist"
-              echo "Contents of dist directory:"
-              ls dist/
-              twine upload --verbose dist/*
+                echo "Twine upload to dist"
+                echo "Contents of dist directory:"
+                ls dist/
+                twine upload --verbose dist/*
             else
-              echo "No changes to pyproject.toml. Skipping PyPI publish."
-              circleci step halt
+                echo "Version ${VERSION} of package is already published on PyPI. Skipping PyPI publish."
+                circleci step halt
             fi
 
 workflows: