diff --git a/pyproject.toml b/pyproject.toml
index bfaf05a..7332c81 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,6 +27,7 @@ source = "vcs"
 
 [dependency-groups]
 dev = [
+    "pillow>=10.0.0",
     "playwright>=1.60.0",
     "pytest>=8.4.2",
     "pytest-cov>=6.0.0",
diff --git a/specs/009-vlm-image-input/tasks.md b/specs/009-vlm-image-input/tasks.md
index 1ed50c0..a7f5ea0 100644
--- a/specs/009-vlm-image-input/tasks.md
+++ b/specs/009-vlm-image-input/tasks.md
@@ -25,7 +25,7 @@ handling lives only in the `comfy`-guarded `ollama.py`.
 
 ## Phase 1: Setup
 
-- [ ] T001 Add `pillow` to `[dependency-groups].dev` in `pyproject.toml` — lets the node's tensor→PNG encoder be unit-tested without a live ComfyUI; runtime Pillow/numpy are ComfyUI-provided, so **no core runtime dependency is added** (research.md Decision 4)
+- [x] T001 Add `pillow` to `[dependency-groups].dev` in `pyproject.toml` — lets the node's tensor→PNG encoder be unit-tested without a live ComfyUI; runtime Pillow/numpy are ComfyUI-provided, so **no core runtime dependency is added** (research.md Decision 4)
 
 ---
 
diff --git a/uv.lock b/uv.lock
index 167e86e..5121ab8 100644
--- a/uv.lock
+++ b/uv.lock
@@ -273,6 +273,7 @@ dependencies = [
 
 [package.dev-dependencies]
 dev = [
+    { name = "pillow" },
     { name = "playwright" },
     { name = "pytest" },
     { name = "pytest-cov" },
@@ -301,6 +302,7 @@ requires-dist = [
 
 [package.metadata.requires-dev]
 dev = [
+    { name = "pillow", specifier = ">=10.0.0" },
     { name = "playwright", specifier = ">=1.60.0" },
     { name = "pytest", specifier = ">=8.4.2" },
     { name = "pytest-cov", specifier = ">=6.0.0" },