diff --git a/pyproject.toml b/pyproject.toml
index 82c2c92..4ed91ed 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -48,6 +48,7 @@ kicoil-gui = "kicoil.gui:main"
 [dependency-groups]
 dev = [
     "ipykernel>=7.1.0",
+    "matplotlib>=3.10.8",
 ]
 gui = ["cairosvg", "pillow"]
 gds = ["gdstk"]
diff --git a/uv.lock b/uv.lock
index c2048c5..fea122a 100644
--- a/uv.lock
+++ b/uv.lock
@@ -585,6 +585,7 @@ dependencies = [
 [package.dev-dependencies]
 dev = [
     { name = "ipykernel" },
+    { name = "matplotlib" },
 ]
 gds = [
     { name = "gdstk" },
@@ -607,7 +608,10 @@ requires-dist = [
 ]
 
 [package.metadata.requires-dev]
-dev = [{ name = "ipykernel", specifier = ">=7.1.0" }]
+dev = [
+    { name = "ipykernel", specifier = ">=7.1.0" },
+    { name = "matplotlib", specifier = ">=3.10.8" },
+]
 gds = [{ name = "gdstk" }]
 gui = [
     { name = "cairosvg" },