diff --git a/.github/markdown-link-check.json b/.github/markdown-link-check.json
index 3f3487d94..d4420db7b 100644
--- a/.github/markdown-link-check.json
+++ b/.github/markdown-link-check.json
@@ -5,6 +5,9 @@
     },
     {
       "pattern": "^https://twitter.com/artichokeruby"
+    },
+    {
+      "pattern": "^https://www.reddit.com/r/rust/"
     }
   ],
   "replacementPatterns": [],
diff --git a/Cargo.toml b/Cargo.toml
index 8517f9c66..f7914e7d5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,10 +1,10 @@
 [package]
 name = "cactusref"
-version = "0.4.0" # remember to set `html_root_url` in `src/lib.rs`.
+version = "0.5.0" # remember to set `html_root_url` in `src/lib.rs`.
 authors = ["Ryan Lopopolo <rjl@hyperbo.la>"]
 license = "MIT"
 edition = "2021"
-rust-version = "1.56.0"
+rust-version = "1.77.0"
 readme = "README.md"
 repository = "https://github.com/artichoke/cactusref"
 documentation = "https://docs.rs/cactusref"
diff --git a/README.md b/README.md
index cbdc4f044..049c4c818 100644
--- a/README.md
+++ b/README.md
@@ -52,7 +52,7 @@ Add this to your `Cargo.toml`:
 
 ```toml
 [dependencies]
-cactusref = "0.4.0"
+cactusref = "0.5.0"
 ```
 
 CactusRef is mostly a drop-in replacement for `std::rc::Rc`, which can be used
diff --git a/src/lib.rs b/src/lib.rs
index 6821ed9d2..4000f7454 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,12 +7,14 @@
     slice_ptr_get
 )]
 #![allow(incomplete_features)]
+#![allow(internal_features)]
 #![warn(clippy::all)]
 #![warn(clippy::pedantic)]
 #![warn(clippy::cargo)]
 #![allow(clippy::cast_possible_wrap)]
 #![allow(clippy::inline_always)]
 #![allow(clippy::let_underscore_untyped)]
+#![allow(clippy::manual_let_else)]
 #![allow(clippy::missing_panics_doc)]
 #![allow(clippy::option_if_let_else)]
 #![allow(clippy::needless_pass_by_ref_mut)]
@@ -126,7 +128,7 @@
 //! [`CoerceUnsized`]: core::ops::CoerceUnsized
 //! [`DispatchFromDyn`]: core::ops::DispatchFromDyn
 
-#![doc(html_root_url = "https://docs.rs/cactusref/0.4.0")]
+#![doc(html_root_url = "https://docs.rs/cactusref/0.5.0")]
 #![no_std]
 
 // Ensure code blocks in README.md compile
diff --git a/src/rc.rs b/src/rc.rs
index 6ed6de0ee..54ce4b26f 100644
--- a/src/rc.rs
+++ b/src/rc.rs
@@ -261,6 +261,7 @@ use crate::link::Links;
 
 #[cfg(test)]
 #[allow(clippy::redundant_clone)]
+#[allow(clippy::uninlined_format_args)]
 mod tests;
 
 // This is repr(C) to future-proof against possible field-reordering, which
@@ -1005,7 +1006,7 @@ impl<T> Rc<T> {
 
             // Copy value as bytes
             ptr::copy_nonoverlapping(
-                (box_ptr as *const T).cast::<u8>(),
+                box_ptr.cast_const().cast::<u8>(),
                 ptr::addr_of_mut!((*ptr).value).cast::<u8>(),
                 value_size,
             );
@@ -1507,7 +1508,7 @@ impl<T> Weak<T> {
     pub unsafe fn from_raw(ptr: *const T) -> Self {
         // See Weak::as_ptr for context on how the input pointer is derived.
 
-        let ptr = if is_dangling(ptr as *mut T) {
+        let ptr = if is_dangling(ptr.cast_mut()) {
             // This is a dangling Weak.
             ptr as *mut RcBox<T>
         } else {