diff --git a/.github/workflows/main-CI.yml b/.github/workflows/main-CI.yml
index 8b172cb7..529638be 100644
--- a/.github/workflows/main-CI.yml
+++ b/.github/workflows/main-CI.yml
@@ -29,7 +29,7 @@ jobs:
           python-version: '3.7'
 
       - name: Install Deps
-        run: pip install poetry
+        run: make configure
 
       - name: Configure AWS Credentials
         uses: aws-actions/configure-aws-credentials@v1
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 8cf12485..6b3e119b 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -7,6 +7,12 @@ foursight-cgap
 Change Log
 ----------
 
+3.3.3
+=====
+* Pin poetry 1.3.2
+* Use at least poetry_core 1.0
+
+
 3.3.2
 =====
 * Update to foursight-core 3.3.2 (and dcicutils 6.8.0).
diff --git a/Makefile b/Makefile
index 26979597..7f809a89 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ clear-poetry-cache:  # clear poetry/pypi cache. for user to do explicitly, never
 	poetry cache clear pypi --all
 
 configure:  # does any pre-requisite installs
-	pip install poetry
+	pip install poetry==1.3.2
 
 build:  # builds
 	make configure
diff --git a/pyproject.toml b/pyproject.toml
index 73d317bb..9664cebc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "foursight-cgap"
-version = "3.3.2"
+version = "3.3.3"
 description = "Serverless Chalice Application for Monitoring"
 authors = ["4DN-DCIC Team <support@4dnucleome.org>"]
 license = "MIT"
@@ -36,5 +36,5 @@ pytest-cov = "2.7.1"
 flaky = "3.6.1"
 
 [build-system]
-requires = ["poetry>=0.12"]
-build-backend = "poetry.masonry.api"
+requires = ["poetry_core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"