diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
index c70aafb..b83ed4c 100644
--- a/.cargo_vcs_info.json
+++ b/.cargo_vcs_info.json
@@ -1,5 +1,5 @@
 {
   "git": {
-    "sha1": "d27882cbd870cf867975a10ce019c05e86016372"
+    "sha1": "5a3570163b7e998b62ee9315522c37465b3cd12b"
   }
 }
diff --git a/Cargo.toml b/Cargo.toml
index 0420a2f..877b230 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@
 
 [package]
 name = "regex-syntax"
-version = "0.6.22"
+version = "0.6.23"
 authors = ["The Rust Project Developers"]
 description = "A regular expression parser."
 homepage = "https://github.com/rust-lang/regex"
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
index 765eb37..8461178 100644
--- a/Cargo.toml.orig
+++ b/Cargo.toml.orig
@@ -1,6 +1,6 @@
 [package]
 name = "regex-syntax"
-version = "0.6.22"  #:version
+version = "0.6.23"  #:version
 authors = ["The Rust Project Developers"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rust-lang/regex"
diff --git a/METADATA b/METADATA
index 1c7218b..47fd83e 100644
--- a/METADATA
+++ b/METADATA
@@ -7,13 +7,13 @@
   }
   url {
     type: ARCHIVE
-    value: "https://static.crates.io/crates/regex-syntax/regex-syntax-0.6.22.crate"
+    value: "https://static.crates.io/crates/regex-syntax/regex-syntax-0.6.23.crate"
   }
-  version: "0.6.22"
+  version: "0.6.23"
   license_type: NOTICE
   last_upgrade_date {
     year: 2021
-    month: 1
-    day: 8
+    month: 4
+    day: 1
   }
 }
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 28d44c6..695cd9b 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -2,16 +2,16 @@
 {
   "presubmit": [
     {
-      "name": "keystore2_test"
+      "name": "regex-syntax_device_test_src_lib"
     },
     {
-      "name": "regex-syntax_device_test_src_lib"
+      "name": "libsqlite3-sys_device_test_src_lib"
     },
     {
       "name": "vpnprofilestore_test"
     },
     {
-      "name": "libsqlite3-sys_device_test_src_lib"
+      "name": "keystore2_test"
     }
   ]
 }
diff --git a/src/lib.rs b/src/lib.rs
index edf1b99..6be634a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -216,7 +216,7 @@
 /// character.
 ///
 /// A Unicode word character is defined by
-/// [UTS#18 Annex C](http://unicode.org/reports/tr18/#Compatibility_Properties).
+/// [UTS#18 Annex C](https://unicode.org/reports/tr18/#Compatibility_Properties).
 /// In particular, a character
 /// is considered a word character if it is in either of the `Alphabetic` or
 /// `Join_Control` properties, or is in one of the `Decimal_Number`, `Mark`
@@ -236,7 +236,7 @@
 /// character.
 ///
 /// A Unicode word character is defined by
-/// [UTS#18 Annex C](http://unicode.org/reports/tr18/#Compatibility_Properties).
+/// [UTS#18 Annex C](https://unicode.org/reports/tr18/#Compatibility_Properties).
 /// In particular, a character
 /// is considered a word character if it is in either of the `Alphabetic` or
 /// `Join_Control` properties, or is in one of the `Decimal_Number`, `Mark`
diff --git a/src/unicode.rs b/src/unicode.rs
index a78362b..73df698 100644
--- a/src/unicode.rs
+++ b/src/unicode.rs
@@ -823,7 +823,7 @@
 /// The slice returned is guaranteed to be valid UTF-8 for all possible values
 /// of `slice`.
 ///
-/// See: http://unicode.org/reports/tr44/#UAX44-LM3
+/// See: https://unicode.org/reports/tr44/#UAX44-LM3
 fn symbolic_name_normalize_bytes(slice: &mut [u8]) -> &mut [u8] {
     // I couldn't find a place in the standard that specified that property
     // names/aliases had a particular structure (unlike character names), but
diff --git a/src/utf8.rs b/src/utf8.rs
index 89862af..947ba7c 100644
--- a/src/utf8.rs
+++ b/src/utf8.rs
@@ -15,7 +15,7 @@
 scalar value range is `[0400-04FF]`. The set of allowed bytes for this
 range can be expressed as a sequence of byte ranges:
 
-```ignore
+```text
 [D0-D3][80-BF]
 ```
 
@@ -32,7 +32,7 @@
 
 Instead, you need multiple sequences of byte ranges:
 
-```ignore
+```text
 [D0-D3][80-BF]  # matches codepoints 0400-04FF
 [D4][80-AF]     # matches codepoints 0500-052F
 ```
@@ -41,7 +41,7 @@
 they naively contain surrogate codepoints. For example, the sequence of byte
 ranges for the basic multilingual plane (`[0000-FFFF]`) look like this:
 
-```ignore
+```text
 [0-7F]
 [C2-DF][80-BF]
 [E0][A0-BF][80-BF]
@@ -55,7 +55,7 @@
 
 And, of course, for all of Unicode (`[000000-10FFFF]`):
 
-```ignore
+```text
 [0-7F]
 [C2-DF][80-BF]
 [E0][A0-BF][80-BF]
@@ -157,13 +157,13 @@
     ///
     /// For example, if this corresponds to the following sequence:
     ///
-    /// ```ignore
+    /// ```text
     /// [D0-D3][80-BF]
     /// ```
     ///
     /// Then after reversal, it will be
     ///
-    /// ```ignore
+    /// ```text
     /// [80-BF][D0-D3]
     /// ```
     ///