diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index e907d8d..ccee083 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -7,6 +7,8 @@ RUN pip install --user -r requirements.txt
 
 FROM python:3.9-slim
 
+ENV MPLBACKEND=Agg
+
 COPY --from=builder /root/.local /root/.local
 RUN pip install --no-cache-dir black
 
diff --git a/Dockerfile b/Dockerfile
index 4e2ad64..7ae49d2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,6 +7,8 @@ RUN pip install --user -r requirements.txt
 
 FROM python:3.9-slim
 
+ENV MPLBACKEND=Agg
+
 COPY --from=builder /root/.local /root/.local