diff --git a/compiler/rustc_feature/src/builtin_attrs.rs b/compiler/rustc_feature/src/builtin_attrs.rs
index d74e8442545b7..2c2dae0fef52e 100644
--- a/compiler/rustc_feature/src/builtin_attrs.rs
+++ b/compiler/rustc_feature/src/builtin_attrs.rs
@@ -862,13 +862,6 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
         register_tool, CrateLevel, template!(List: &["tool1, tool2, ..."]), DuplicatesOk,
         EncodeCrossCrate::No, experimental!(register_tool),
     ),
-
-    // lang-team MCP 147
-    gated!(
-        deprecated_safe, Normal, template!(List: &[r#"since = "version", note = "...""#]), ErrorFollowing,
-        EncodeCrossCrate::Yes, experimental!(deprecated_safe),
-    ),
-
     // `#[cfi_encoding = ""]`
     gated!(
         cfi_encoding, Normal, template!(NameValueStr: "encoding"), ErrorPreceding,
diff --git a/compiler/rustc_feature/src/removed.rs b/compiler/rustc_feature/src/removed.rs
index 4f4691468911a..71a735cd8cc78 100644
--- a/compiler/rustc_feature/src/removed.rs
+++ b/compiler/rustc_feature/src/removed.rs
@@ -102,6 +102,8 @@ declare_features! (
     /// Allows default type parameters to influence type inference.
     (removed, default_type_parameter_fallback, "1.82.0", Some(27336),
      Some("never properly implemented; requires significant design work"), 127655),
+    /// Allows using `#[deprecated_safe]` to deprecate the safeness of a function or trait
+    (removed, deprecated_safe, "CURRENT_RUSTC_VERSION", Some(94978), Some("never properly implemented, in the way of attribute refactor"), 152554),
     /// Allows deriving traits as per `SmartPointer` specification
     (removed, derive_smart_pointer, "1.84.0", Some(123430), Some("replaced by `CoercePointee`"), 131284),
     /// Tells rustdoc to automatically generate `#[doc(cfg(...))]`.
diff --git a/compiler/rustc_feature/src/unstable.rs b/compiler/rustc_feature/src/unstable.rs
index add09c3ea58b0..082558cf9a93f 100644
--- a/compiler/rustc_feature/src/unstable.rs
+++ b/compiler/rustc_feature/src/unstable.rs
@@ -454,8 +454,6 @@ declare_features! (
     /// Allows the use of default values on struct definitions and the construction of struct
     /// literals with the functional update syntax without a base.
     (unstable, default_field_values, "1.85.0", Some(132162)),
-    /// Allows using `#[deprecated_safe]` to deprecate the safeness of a function or trait
-    (unstable, deprecated_safe, "1.61.0", Some(94978)),
     /// Allows having using `suggestion` in the `#[deprecated]` attribute.
     (unstable, deprecated_suggestion, "1.61.0", Some(94785)),
     /// Allows deref patterns.
diff --git a/compiler/rustc_passes/src/check_attr.rs b/compiler/rustc_passes/src/check_attr.rs
index b6f0e9fedd6d8..c559e799f1c5f 100644
--- a/compiler/rustc_passes/src/check_attr.rs
+++ b/compiler/rustc_passes/src/check_attr.rs
@@ -391,8 +391,6 @@ impl<'tcx> CheckAttrVisitor<'tcx> {
                             | sym::warn
                             | sym::deny
                             | sym::forbid
-                            // need to be fixed
-                            | sym::deprecated_safe // FIXME(deprecated_safe)
                             // internal
                             | sym::prelude_import
                             | sym::panic_handler
diff --git a/tests/ui/feature-gates/feature-gate-deprecated_safe.rs b/tests/ui/feature-gates/feature-gate-deprecated_safe.rs
deleted file mode 100644
index d5f4a4705b972..0000000000000
--- a/tests/ui/feature-gates/feature-gate-deprecated_safe.rs
+++ /dev/null
@@ -1,7 +0,0 @@
-#[deprecated_safe(since = "TBD", note = "...")] //~ ERROR: the `#[deprecated_safe]` attribute is an experimental feature
-unsafe fn deprecated_safe_fn() {}
-
-#[deprecated_safe(since = "TBD", note = "...")] //~ ERROR: the `#[deprecated_safe]` attribute is an experimental feature
-unsafe trait DeprecatedSafeTrait {}
-
-fn main() {}
diff --git a/tests/ui/feature-gates/feature-gate-deprecated_safe.stderr b/tests/ui/feature-gates/feature-gate-deprecated_safe.stderr
deleted file mode 100644
index 415d54463d1a4..0000000000000
--- a/tests/ui/feature-gates/feature-gate-deprecated_safe.stderr
+++ /dev/null
@@ -1,23 +0,0 @@
-error[E0658]: the `#[deprecated_safe]` attribute is an experimental feature
-  --> $DIR/feature-gate-deprecated_safe.rs:1:1
-   |
-LL | #[deprecated_safe(since = "TBD", note = "...")]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #94978 <https://github.com/rust-lang/rust/issues/94978> for more information
-   = help: add `#![feature(deprecated_safe)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: the `#[deprecated_safe]` attribute is an experimental feature
-  --> $DIR/feature-gate-deprecated_safe.rs:4:1
-   |
-LL | #[deprecated_safe(since = "TBD", note = "...")]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   |
-   = note: see issue #94978 <https://github.com/rust-lang/rust/issues/94978> for more information
-   = help: add `#![feature(deprecated_safe)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error: aborting due to 2 previous errors
-
-For more information about this error, try `rustc --explain E0658`.