diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index f8671dab..b1dc816b 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -57,7 +57,6 @@ jobs:
 
     - run: cargo build
     - run: cargo test
-    - run: cargo test --features "serialize-rustc"
     - run: cargo test --features "serialize-serde"
     - run: cargo test --features "verify-winapi"
     - run: cargo test --features "cpp_demangle"
diff --git a/Cargo.lock b/Cargo.lock
index ba8c53f4..af2bbad8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -44,7 +44,6 @@ dependencies = [
  "miniz_oxide",
  "object",
  "rustc-demangle",
- "rustc-serialize",
  "serde",
  "winapi",
 ]
@@ -152,12 +151,6 @@ version = "0.1.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d626bb9dae77e28219937af045c257c28bfd3f69333c512553507f5f9798cb76"
 
-[[package]]
-name = "rustc-serialize"
-version = "0.3.25"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fe834bc780604f4674073badbad26d7219cadfb4a2275802db12cbae17498401"
-
 [[package]]
 name = "serde"
 version = "1.0.188"
diff --git a/Cargo.toml b/Cargo.toml
index e1ee1c37..9bd7b63c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,10 +20,10 @@ rust-version = "1.65.0"
 [workspace]
 members = ['crates/cpp_smoke_test', 'crates/as-if-std']
 exclude = [
-   'crates/without_debuginfo',
-   'crates/macos_frames_test',
-   'crates/line-tables-only',
-   'crates/debuglink',
+  'crates/without_debuginfo',
+  'crates/macos_frames_test',
+  'crates/line-tables-only',
+  'crates/debuglink',
 ]
 
 [dependencies]
@@ -33,10 +33,11 @@ rustc-demangle = "0.1.4"
 # Optionally enable the ability to serialize a `Backtrace`, controlled through
 # the `serialize-*` features below.
 serde = { version = "1.0", optional = true, features = ['derive'] }
-rustc-serialize = { version = "0.3", optional = true }
 
 # Optionally demangle C++ frames' symbols in backtraces.
-cpp_demangle = { default-features = false, version = "0.4.0", optional = true, features = ["alloc"] }
+cpp_demangle = { default-features = false, version = "0.4.0", optional = true, features = [
+  "alloc",
+] }
 
 [target.'cfg(not(all(windows, target_env = "msvc", not(target_vendor = "uwp"))))'.dependencies]
 miniz_oxide = { version = "0.7.0", default-features = false }
@@ -71,7 +72,6 @@ std = []
 # Methods of serialization
 #
 # Various features used for enabling rustc-serialize or syntex codegen.
-serialize-rustc = ["rustc-serialize"]
 serialize-serde = ["serde"]
 
 #=======================================
diff --git a/src/capture.rs b/src/capture.rs
index 73d94dc4..d1691b89 100644
--- a/src/capture.rs
+++ b/src/capture.rs
@@ -21,7 +21,6 @@ use serde::{Deserialize, Serialize};
 /// This function requires the `std` feature of the `backtrace` crate to be
 /// enabled, and the `std` feature is enabled by default.
 #[derive(Clone)]
-#[cfg_attr(feature = "serialize-rustc", derive(RustcDecodable, RustcEncodable))]
 #[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
 pub struct Backtrace {
     // Frames here are listed from top-to-bottom of the stack
@@ -116,7 +115,6 @@ impl Frame {
 /// This function requires the `std` feature of the `backtrace` crate to be
 /// enabled, and the `std` feature is enabled by default.
 #[derive(Clone)]
-#[cfg_attr(feature = "serialize-rustc", derive(RustcDecodable, RustcEncodable))]
 #[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
 pub struct BacktraceSymbol {
     name: Option<Vec<u8>>,
@@ -440,53 +438,6 @@ impl fmt::Debug for BacktraceSymbol {
     }
 }
 
-#[cfg(feature = "serialize-rustc")]
-mod rustc_serialize_impls {
-    use super::*;
-    use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
-
-    #[derive(RustcEncodable, RustcDecodable)]
-    struct SerializedFrame {
-        ip: usize,
-        symbol_address: usize,
-        module_base_address: Option<usize>,
-        symbols: Option<Vec<BacktraceSymbol>>,
-    }
-
-    impl Decodable for BacktraceFrame {
-        fn decode<D>(d: &mut D) -> Result<Self, D::Error>
-        where
-            D: Decoder,
-        {
-            let frame: SerializedFrame = SerializedFrame::decode(d)?;
-            Ok(BacktraceFrame {
-                frame: Frame::Deserialized {
-                    ip: frame.ip,
-                    symbol_address: frame.symbol_address,
-                    module_base_address: frame.module_base_address,
-                },
-                symbols: frame.symbols,
-            })
-        }
-    }
-
-    impl Encodable for BacktraceFrame {
-        fn encode<E>(&self, e: &mut E) -> Result<(), E::Error>
-        where
-            E: Encoder,
-        {
-            let BacktraceFrame { frame, symbols } = self;
-            SerializedFrame {
-                ip: frame.ip() as usize,
-                symbol_address: frame.symbol_address() as usize,
-                module_base_address: frame.module_base_address().map(|addr| addr as usize),
-                symbols: symbols.clone(),
-            }
-            .encode(e)
-        }
-    }
-}
-
 #[cfg(feature = "serde")]
 mod serde_impls {
     use super::*;
diff --git a/src/lib.rs b/src/lib.rs
index 5b97281a..7b4bbc2e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -97,8 +97,6 @@
 // irrelevant as this crate is developed out-of-tree.
 #![cfg_attr(backtrace_in_libstd, allow(warnings))]
 #![cfg_attr(not(feature = "std"), allow(dead_code))]
-// We know this is deprecated, it's only here for back-compat reasons.
-#![cfg_attr(feature = "rustc-serialize", allow(deprecated))]
 
 #[cfg(feature = "std")]
 #[macro_use]
diff --git a/tests/smoke.rs b/tests/smoke.rs
index b47f0232..9c87f530 100644
--- a/tests/smoke.rs
+++ b/tests/smoke.rs
@@ -230,18 +230,6 @@ fn many_threads() {
     }
 }
 
-#[test]
-#[cfg(feature = "rustc-serialize")]
-fn is_rustc_serialize() {
-    extern crate rustc_serialize;
-
-    fn is_encode<T: rustc_serialize::Encodable>() {}
-    fn is_decode<T: rustc_serialize::Decodable>() {}
-
-    is_encode::<backtrace::Backtrace>();
-    is_decode::<backtrace::Backtrace>();
-}
-
 #[test]
 #[cfg(feature = "serde")]
 fn is_serde() {