diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f0a7165..2c834e6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -62,7 +62,7 @@ jobs:
             libxcb-image0 libxcb-keysyms1 libxcb-randr0 libxcb-render-util0 \
             libxcb-shape0 libxcb-sync1 libxcb-xfixes0 libxcb-xinerama0 \
             libxcb-cursor0 libdbus-1-3 libgl1 libxkbcommon0 xvfb
-      - run: pip install -e ".[dev]"
+      - run: pip install -e ".[gui,dev]"
       - run: xvfb-run -a pytest tests/gui -m "not slow"
 
   test-integration:
diff --git a/pyproject.toml b/pyproject.toml
index ffab17d..d67c45f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -42,6 +42,7 @@ gui = [
     "vtk>=9.3",
     "pyqtgraph>=0.13",
     "imageio[ffmpeg]>=2.34",
+    "plotly>=5.18",
 ]
 dev = [
     "pytest>=7.4",