diff --git a/.github/workflows/builds.yml b/.github/workflows/builds.yml
index 9a89535..cab333f 100644
--- a/.github/workflows/builds.yml
+++ b/.github/workflows/builds.yml
@@ -95,31 +95,51 @@ jobs:
         run: |
           docker build . --rm --target base \
             --build-arg LINUX_VERSION="$LINUX_VERSION" \
+            --build-arg POETRY_VERSION="$POETRY_VERSION" \
             --build-arg PYTHON_VERSION="$PYTHON_VERSION" \
             --cache-from python:"$PYTHON_VERSION$LINUX_TAG" \
             -t ghcr.io/br3ndonland/inboard:base"$LINUX_TAG"
           docker build . --rm --target starlette \
             --build-arg LINUX_VERSION="$LINUX_VERSION" \
+            --build-arg POETRY_VERSION="$POETRY_VERSION" \
             --build-arg PYTHON_VERSION="$PYTHON_VERSION" \
             -t ghcr.io/br3ndonland/inboard:starlette"$LINUX_TAG"
           docker build . --rm --target fastapi \
             --build-arg LINUX_VERSION="$LINUX_VERSION" \
+            --build-arg POETRY_VERSION="$POETRY_VERSION" \
             --build-arg PYTHON_VERSION="$PYTHON_VERSION" \
             -t ghcr.io/br3ndonland/inboard:fastapi"$LINUX_TAG"
       - name: Run Docker containers for testing
         run: |
-          docker run -d -p 80:80 \
+          docker run -d -p 80:80 --name inboard-base \
             -e "BASIC_AUTH_USERNAME=test_user" \
             -e "BASIC_AUTH_PASSWORD=r4ndom_bUt_memorable" \
             ghcr.io/br3ndonland/inboard:base"$LINUX_TAG"
-          docker run -d -p 81:80 \
+          docker run -d -p 81:80 --name inboard-starlette \
             -e "BASIC_AUTH_USERNAME=test_user" \
             -e "BASIC_AUTH_PASSWORD=r4ndom_bUt_memorable" \
             ghcr.io/br3ndonland/inboard:starlette"$LINUX_TAG"
-          docker run -d -p 82:80 \
+          docker run -d -p 82:80 --name inboard-fastapi \
             -e "BASIC_AUTH_USERNAME=test_user" \
             -e "BASIC_AUTH_PASSWORD=r4ndom_bUt_memorable" \
             ghcr.io/br3ndonland/inboard:fastapi"$LINUX_TAG"
+      - name: Test Poetry version in Docker containers
+        run: |
+          test_poetry_version_in_docker() {
+            echo "The POETRY_VERSION environment variable is set to $POETRY_VERSION."
+            local poetry_version_in_docker
+            for container_name in "$@"; do
+              poetry_version_in_docker=$(docker exec "$container_name" poetry -V)
+              if [ -n "$poetry_version_in_docker" ]; then
+                echo "Docker container $container_name has $poetry_version_in_docker."
+              fi
+              case $poetry_version_in_docker in
+              *$POETRY_VERSION*) echo "Poetry versions match for $container_name." ;;
+              *) echo "Poetry version test failed for $container_name." && return 1 ;;
+              esac
+            done
+          }
+          test_poetry_version_in_docker inboard-base inboard-starlette inboard-fastapi
       - name: Smoke test Docker containers
         run: |
           handle_error_code() {
diff --git a/Dockerfile b/Dockerfile
index 68f4f35..070c97f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,12 +6,12 @@ LABEL org.opencontainers.image.licenses="MIT"
 LABEL org.opencontainers.image.source="https://github.com/br3ndonland/inboard"
 LABEL org.opencontainers.image.title="inboard"
 LABEL org.opencontainers.image.url="https://github.com/br3ndonland/inboard/pkgs/container/inboard"
-ARG LINUX_VERSION
-ENV APP_MODULE=inboard.app.main_base:app LINUX_VERSION=$LINUX_VERSION PATH=/opt/poetry/bin:$PATH POETRY_HOME=/opt/poetry POETRY_VIRTUALENVS_CREATE=false PYTHONPATH=/app
+ARG LINUX_VERSION POETRY_VERSION=1.1.7
+ENV APP_MODULE=inboard.app.main_base:app LINUX_VERSION=$LINUX_VERSION PATH=/opt/poetry/bin:$PATH POETRY_HOME=/opt/poetry POETRY_VERSION=$POETRY_VERSION POETRY_VIRTUALENVS_CREATE=false PYTHONPATH=/app
 COPY poetry.lock pyproject.toml /app/
 WORKDIR /app/
 RUN sh -c 'if [ "$LINUX_VERSION" = "slim" ]; then apt-get update -qy && apt-get install -qy --no-install-recommends gcc libc-dev make wget; fi' && \
-  wget -qO get-poetry.py https://raw.githubusercontent.com/python-poetry/poetry/HEAD/get-poetry.py && \
+  wget -qO get-poetry.py "https://raw.githubusercontent.com/python-poetry/poetry/$POETRY_VERSION/get-poetry.py" && \
   sh -c '. /etc/os-release; if [ "$ID" = "alpine" ]; then apk add --no-cache --virtual .build-deps gcc libc-dev make; fi' && \
   python get-poetry.py -y && poetry install --no-dev --no-interaction --no-root && \
   sh -c 'if [ "$LINUX_VERSION" = "slim" ]; then apt-get purge --auto-remove -qy gcc libc-dev make wget; fi' && \