diff --git a/Dockerfile b/Dockerfile
index 027f1485..f73dd635 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -36,7 +36,7 @@ RUN curl -sSL https://install.python-poetry.org | POETRY_HOME=/opt/poetry python
 
 WORKDIR /app
 
-COPY barker/pyproject.toml /app/pyproject.toml
+COPY barker/pyproject.toml barker/poetry.lock /app
 
 # Allow installing dev dependencies to run tests
 ARG INSTALL_DEV=false