diff --git a/.github/scripts/setup-env.sh b/.github/scripts/setup-env.sh
index 96935bc..cb6640e 100755
--- a/.github/scripts/setup-env.sh
+++ b/.github/scripts/setup-env.sh
@@ -4,11 +4,13 @@
 # to create a repeatable local environment for tests to be run in. The python env
 # this script creates can be accessed at the location defined by the CI_VENV variable
 # below.
+#
+# POETRY_VERSION can be set to install a specific version of Poetry
 
 set -e;
 
 CI_CACHE=$HOME/.cache;
-POETRY_VERSION=1.3.2;
+INSTALL_POETRY_VERSION="${POETRY_VERSION:-1.3.2}";
 
 mkdir --parents "$CI_CACHE";
 
@@ -20,7 +22,7 @@ curl --location https://install.python-poetry.org \
   --silent \
   --show-error;
 python "$CI_CACHE/install-poetry.py" \
-  --version "$POETRY_VERSION" \
+  --version "$INSTALL_POETRY_VERSION" \
   --yes;
 poetry --version --no-ansi;
 poetry run pip --version;
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 522ea05..21ffb3b 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -5,6 +5,8 @@ on:
     types: ["opened", "synchronize"]
   push:
     branches: ["devel"]
+env:
+  POETRY_VERSION: 1.4.1
 jobs:
   Test:
     name: Python ${{ matrix.python.version }}
diff --git a/poetry.lock b/poetry.lock
index 4e15f57..cd31d52 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -884,6 +884,7 @@ files = [
 ]
 
 [package.dependencies]
+typing-extensions = {version = ">=3.6.4", markers = "python_version < \"3.8\""}
 zipp = ">=0.5"
 
 [package.extras]
@@ -1687,6 +1688,9 @@ files = [
     {file = "poetry_core-1.5.2.tar.gz", hash = "sha256:c6556c3b1ec5b8668e6ef5a4494726bc41d31907339425e194e78a6178436c14"},
 ]
 
+[package.dependencies]
+importlib-metadata = {version = ">=1.7.0", markers = "python_version < \"3.8\""}
+
 [[package]]
 name = "poetry-plugin-export"
 version = "1.3.0"
@@ -2443,6 +2447,7 @@ files = [
 [package.dependencies]
 colorama = {version = ">=0.4.1", markers = "platform_system == \"Windows\""}
 filelock = ">=3.0.0"
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 packaging = ">=14"
 pluggy = ">=0.12.0"
 py = ">=1.4.17"
@@ -2559,6 +2564,7 @@ files = [
 [package.dependencies]
 distlib = ">=0.3.6,<1"
 filelock = ">=3.4.1,<4"
+importlib-metadata = {version = ">=4.8.3", markers = "python_version < \"3.8\""}
 platformdirs = ">=2.4,<4"
 
 [package.extras]
@@ -2781,4 +2787,4 @@ ansible = ["ansible-core"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.6.1"
-content-hash = "1980180d1636622d3aed84a9e8b3d0645b30d4ad3a765e82870ab0591b5e9126"
+content-hash = "52d2e58443bf0e36f8b66e9575b21cf69f7c6beccbd4948400acff36a38721c7"
diff --git a/pyproject.toml b/pyproject.toml
index e9016fc..ea6913b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -68,8 +68,10 @@ toml = {version = "^0.10.1", python = "^3.6"}
 typing-extensions = {version = "^4.5.0", python = ">3.8"}
 
 [tool.poetry.group.ci.dependencies]
-tox = {version = "^3.20.0", python = "^3.10"}
-tox-poetry-installer = {version = "^0.10.1", extras = ["poetry"], python = "^3.10"}
+# The python versions here need to match the lowest python version
+# used in CI
+tox = {version = "^3.20.0", python = "^3.7"}
+tox-poetry-installer = {version = "^0.10.1", extras = ["poetry"], python = "^3.7"}
 
 [build-system]
 requires = ["poetry-core>=1.1.0"]