diff --git a/planning/releases/3.0.0.md b/planning/releases/3.0.0.md
new file mode 100644
index 0000000..1be4f0e
--- /dev/null
+++ b/planning/releases/3.0.0.md
@@ -0,0 +1,24 @@
+# modern-di-pytest 3.0.0 — modern-di 3.x
+
+Requires **modern-di >= 3, < 4**. **No public API change** — `expose` and
+`modern_di_fixture` keep their signatures and behavior. This is a pytest
+fixture integration, not a framework adapter — there is no per-connection
+container lifecycle to drive. The `tests/conftest.py` fixtures already opened
+their containers with `with`, so the fixture layer is unchanged for
+[modern-di 3.0's mandatory-open lifecycle](https://modern-di.modern-python.org/migration/to-3.x/).
+
+## Packaging
+
+- **Bumped the `modern-di` dependency to `>=3,<4`.** Requires modern-di 3.x;
+  drops support for modern-di 2.x.
+
+## Downstream
+
+No action needed beyond raising your own `modern-di` floor to `>=3`. If your
+code builds child containers, open them with `with` / `async with` (or
+`open()`) before resolving — see the
+[modern-di 3.x migration guide](https://modern-di.modern-python.org/migration/to-3.x/).
+
+## Internals
+
+- 100% line coverage; `ruff`, `ty` clean.
diff --git a/pyproject.toml b/pyproject.toml
index cf57312..d134174 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,7 @@ classifiers = [
     "Topic :: Software Development :: Libraries",
     "Topic :: Software Development :: Testing",
 ]
-dependencies = ["modern-di>=2.25,<3", "pytest>=7"]
+dependencies = ["modern-di>=3,<4", "pytest>=7"]
 version = "0"
 
 [project.urls]