diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0722e6d8..236ffc3b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -195,7 +195,7 @@ jobs:
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: "1.71"
+          toolchain: "1.83"
       - run: cargo check --locked --lib --all-features
 
   cross:
diff --git a/Cargo.lock b/Cargo.lock
index 90ebfa17..3919b0c6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "aho-corasick"
@@ -492,7 +492,7 @@ dependencies = [
 
 [[package]]
 name = "rustls-webpki"
-version = "0.103.7"
+version = "0.104.0"
 dependencies = [
  "aws-lc-rs",
  "base64",
diff --git a/Cargo.toml b/Cargo.toml
index 4864394c..d2c8af3f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,12 +16,12 @@
 categories = ["cryptography", "no-std"]
 description = "Web PKI X.509 Certificate Verification."
 edition = "2021"
-rust-version = "1.71"
+rust-version = "1.83"
 license = "ISC"
 name = "rustls-webpki"
 readme = "README.md"
 repository = "https://github.com/rustls/webpki"
-version = "0.103.7"
+version = "0.104.0"
 
 include = [
     "Cargo.toml",
diff --git a/src/alg_tests.rs b/src/alg_tests.rs
index 23a673ec..ac2ce586 100644
--- a/src/alg_tests.rs
+++ b/src/alg_tests.rs
@@ -620,7 +620,7 @@ fn parse_test_signed_data(file_contents: &[u8]) -> TestSignedData {
     }
 }
 
-use alloc::str::Lines;
+use core::str::Lines;
 
 fn read_pem_section(lines: &mut Lines<'_>, section_name: &str) -> Vec<u8> {
     // Skip comments and header
diff --git a/src/crl/types.rs b/src/crl/types.rs
index e881980b..73b8e867 100644
--- a/src/crl/types.rs
+++ b/src/crl/types.rs
@@ -921,7 +921,7 @@ impl TryFrom<u8> for RevocationReason {
 #[cfg(feature = "alloc")]
 #[cfg(test)]
 mod tests {
-    use std::time::Duration;
+    use core::time::Duration;
 
     use pki_types::CertificateDer;
     use std::prelude::v1::*;
diff --git a/src/error.rs b/src/error.rs
index c104d50d..13fd9336 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -381,8 +381,7 @@ impl fmt::Display for Error {
     }
 }
 
-#[cfg(feature = "std")]
-impl ::std::error::Error for Error {}
+impl core::error::Error for Error {}
 
 /// Additional context for the `CertNotValidForName` error variant.
 ///
diff --git a/src/lib.rs b/src/lib.rs
index 922365f6..36451766 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -31,7 +31,9 @@
     elided_lifetimes_in_paths,
     unnameable_types,
     unreachable_pub,
-    clippy::use_self
+    clippy::alloc_instead_of_core,
+    clippy::use_self,
+    clippy::std_instead_of_core
 )]
 #![deny(missing_docs, clippy::as_conversions)]
 #![allow(
diff --git a/src/subject_name/ip_address.rs b/src/subject_name/ip_address.rs
index 0c60ac02..420160b8 100644
--- a/src/subject_name/ip_address.rs
+++ b/src/subject_name/ip_address.rs
@@ -674,8 +674,8 @@ mod alloc_tests {
 
     #[test]
     fn presented_matches_constraint_test() {
+        use core::net::IpAddr;
         use std::boxed::Box;
-        use std::net::IpAddr;
 
         for (presented, constraint_address, constraint_mask, expected_result) in
             PRESENTED_MATCHES_CONSTRAINT