diff --git a/.github/workflows/poetry-test.yml b/.github/workflows/poetry-test.yml
index f80e027..0a73d32 100644
--- a/.github/workflows/poetry-test.yml
+++ b/.github/workflows/poetry-test.yml
@@ -59,7 +59,7 @@ jobs:
         run: |
           poetry config virtualenvs.in-project true
           poetry install
-          poetry run pip install -U pip
+          poetry run pip install -U pip, ffmpeg
       #----------------------------------------------
       #              run test suite
       #----------------------------------------------
diff --git a/deploy/Dockerfile b/deploy/Dockerfile
index 8aacc24..53d5c28 100644
--- a/deploy/Dockerfile
+++ b/deploy/Dockerfile
@@ -35,7 +35,7 @@ RUN if [ "$USER" != "root" ]; then \
 
 COPY --chown=${USER}:${USER} ../poetry.lock ../pyproject.toml /app/
 
-RUN pip install --upgrade pip && pip install poetry==$POETRY_VERSION
+RUN pip install --upgrade pip && pip install poetry==$POETRY_VERSION && pip install ffmpeg
 RUN poetry config virtualenvs.in-project true && \
     poetry config virtualenvs.create true && \
     poetry install --only main --no-interaction --no-ansi && \