diff --git a/README.md b/README.md
index f988855..b94f452 100644
--- a/README.md
+++ b/README.md
@@ -42,7 +42,7 @@ backends and the optional session transports ship as extras:
 | Extra | Install | Pulls in | Needed for |
 |-------|---------|----------|------------|
 | `redis` | `uv add "fastapi-cachex[redis]"` | `redis[hiredis]`, `orjson` | `AsyncRedisCacheBackend` |
-| `memcached` | `uv add "fastapi-cachex[memcached]"` | `pymemcache` | `MemcachedBackend` (the older `memcache` name still works until 0.4.0) |
+| `memcached` | `uv add "fastapi-cachex[memcached]"` | `pymemcache` | `MemcachedBackend` |
 | `jwt` | `uv add "fastapi-cachex[jwt]"` | `PyJWT` | `SessionConfig(token_format="jwt")` |
 
 Extras combine: `uv add "fastapi-cachex[redis,jwt]"`.
diff --git a/changelog.d/202.removed.md b/changelog.d/202.removed.md
new file mode 100644
index 0000000..d71dbe6
--- /dev/null
+++ b/changelog.d/202.removed.md
@@ -0,0 +1,5 @@
+**The deprecated `memcache` extra is removed; install `fastapi-cachex[memcached]`.**
+The failure is quiet: pip and uv only warn about an unknown extra, so
+`fastapi-cachex[memcache]` still installs, but without `pymemcache`, and
+`MemcachedBackend` raises when it is constructed. Replace `[memcache]` with
+`[memcached]` in your requirements.
diff --git a/docs/BACKENDS.md b/docs/BACKENDS.md
index 9248752..f985e76 100644
--- a/docs/BACKENDS.md
+++ b/docs/BACKENDS.md
@@ -164,9 +164,10 @@ after about 0.25 s. The costs:
 ## Memcached
 
 Install the extra with `uv add "fastapi-cachex[memcached]"`. Before 0.3.8 it was
-called `memcache`; that name still works but is deprecated and will be removed in
-0.4.0. An unknown extra only produces a warning at install time, so after 0.4.0
-`fastapi-cachex[memcache]` would install without `pymemcache`.
+called `memcache`; 0.4.0 removed that name. An unknown extra only produces a
+warning at install time, so `fastapi-cachex[memcache]` installs without
+`pymemcache` and `MemcachedBackend` raises when it is constructed. See
+[Migrating to 0.4.0](MIGRATING_0_4.md#memcache-extra).
 
 ```python
 from fastapi_cachex.backends import MemcachedBackend
diff --git a/i18n/zh-TW/docs/BACKENDS.md b/i18n/zh-TW/docs/BACKENDS.md
index c5ecc19..3ba0f93 100644
--- a/i18n/zh-TW/docs/BACKENDS.md
+++ b/i18n/zh-TW/docs/BACKENDS.md
@@ -113,7 +113,7 @@ BackendProxy.set(backend)
 
 ## Memcached {#memcached}
 
-以 `uv add "fastapi-cachex[memcached]"` 安裝此 extra。0.3.8 以前這個 extra 名為 `memcache`；舊名稱仍可使用但已棄用，將於 0.4.0 移除。安裝時遇到不存在的 extra 只會顯示警告，因此 0.4.0 之後 `fastapi-cachex[memcache]` 會裝好套件但不含 `pymemcache`。
+以 `uv add "fastapi-cachex[memcached]"` 安裝此 extra。0.3.8 以前這個 extra 名為 `memcache`，0.4.0 已移除這個名稱。安裝時遇到不存在的 extra 只會顯示警告，因此 `fastapi-cachex[memcache]` 會裝好套件但不含 `pymemcache`，建構 `MemcachedBackend` 時才會拋出錯誤。請參閱[遷移至 0.4.0](MIGRATING_0_4.md#memcache-extra)。
 
 ```python
 from fastapi_cachex.backends import MemcachedBackend
diff --git a/i18n/zh-TW/docs/index.md b/i18n/zh-TW/docs/index.md
index db9e012..92f8bc2 100644
--- a/i18n/zh-TW/docs/index.md
+++ b/i18n/zh-TW/docs/index.md
@@ -37,7 +37,7 @@ uv add fastapi-cachex
 | Extra | 安裝 | 帶入套件 | 用途 |
 |-------|------|---------|------|
 | `redis` | `uv add "fastapi-cachex[redis]"` | `redis[hiredis]`、`orjson` | `AsyncRedisCacheBackend` |
-| `memcached` | `uv add "fastapi-cachex[memcached]"` | `pymemcache` | `MemcachedBackend`（舊名稱 `memcache` 在 0.4.0 之前仍可使用） |
+| `memcached` | `uv add "fastapi-cachex[memcached]"` | `pymemcache` | `MemcachedBackend` |
 | `jwt` | `uv add "fastapi-cachex[jwt]"` | `PyJWT` | `SessionConfig(token_format="jwt")` |
 
 Extra 可以組合：`uv add "fastapi-cachex[redis,jwt]"`。
diff --git a/pyproject.toml b/pyproject.toml
index bcbf69b..1e66825 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -70,8 +70,6 @@ docs = [
 
 [project.optional-dependencies]
 memcached = ["pymemcache>=4.0.0"]
-# Deprecated alias of `memcached`, removed in 0.4.0 (#202).
-memcache = ["pymemcache>=4.0.0"]
 redis = ["redis[hiredis]>=5.3.0", "orjson>=3.4.7"]
 jwt = ["PyJWT>=2.9.0"]
 
diff --git a/uv.lock b/uv.lock
index f4bfce4..9c76989 100644
--- a/uv.lock
+++ b/uv.lock
@@ -520,9 +520,6 @@ dependencies = [
 jwt = [
     { name = "pyjwt" },
 ]
-memcache = [
-    { name = "pymemcache" },
-]
 memcached = [
     { name = "pymemcache" },
 ]
@@ -564,12 +561,11 @@ requires-dist = [
     { name = "orjson", marker = "extra == 'redis'", specifier = ">=3.4.7" },
     { name = "pydantic", specifier = ">=2.7.0" },
     { name = "pyjwt", marker = "extra == 'jwt'", specifier = ">=2.9.0" },
-    { name = "pymemcache", marker = "extra == 'memcache'", specifier = ">=4.0.0" },
     { name = "pymemcache", marker = "extra == 'memcached'", specifier = ">=4.0.0" },
     { name = "redis", extras = ["hiredis"], marker = "extra == 'redis'", specifier = ">=5.3.0" },
     { name = "starlette", specifier = ">=1.0.0" },
 ]
-provides-extras = ["memcached", "memcache", "redis", "jwt"]
+provides-extras = ["memcached", "redis", "jwt"]
 
 [package.metadata.requires-dev]
 dev = [