diff --git a/crates/libz-sys/.android-checksum.json b/crates/libz-sys/.android-checksum.json
index e9937b3..6b469be 100644
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index 861fa73..69a5d40 100644
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rc/zlib-ng/gzlib.c":"606f63dd04367055505f19ff6dde7e72e02fdf16f89e12ee4cda84caf3c420f2","src/zlib-ng/gzread.c.in":"3501e5124923207b2603d9695c3bad1815ca2dc8f18b6525bdd5dfea60313acd","src/zlib-ng/gzwrite.c":"9f474aeefaf0150d8871eb9202ebd43a28f18bdf39eaca4f35cfb52227e74c63","src/zlib-ng/infback.c":"3df879c466c963c0143e123abd31a7b75f910eca81caaf4ef482ca94cfa751e6","src/zlib-ng/inffast_tpl.h":"7d0c8ecc079ab25e05e6c13e6d5b52179ef185f75e5d1a6acbfe0f7da9fd8cf0","src/zlib-ng/inffixed_tbl.h":"a94225335396245e9f0ccb2e9b4b334fe7ee0111ed8e32a26bcd52187f364314","src/zlib-ng/inflate.c":"a76652db45c399104087412800102fb188cfe6d132e54067da0f4e0b8e64c23b","src/zlib-ng/inflate.h":"10c134cc9d597fb729310c4c8b626144322e3db9682881443bea143d6afdfeda","src/zlib-ng/inflate_p.h":"7ca493af3e9430d866d34518b17e0358177744e306839d1ad962054da0e129c1","src/zlib-ng/inftrees.c":"d5776b7ec068ac9077aafd8a74e10ea0f2f0951c386ac867b7a1e7e697dfc758","src/zlib-ng/inftrees.h":"2ba1beb76d7922fcb37708809e31f62ee366827da80faf09a7e461b439afd291","src/zlib-ng/insert_string.c":"3c53671ca6f86e80733d7a2582c009ea62a99a62240f6226ed64bd7b8c5e2071","src/zlib-ng/insert_string_roll.c":"36fe2b8cc54d20f31e18543683364cc44da8553a07f93e26ef788f4c8422f115","src/zlib-ng/insert_string_tpl.h":"f6db0d1589c0966547f910caddbc405b79d009417d51744b0a5525fb0043f484","src/zlib-ng/match_tpl.h":"e6b357742ed862a5cd1b3ea9eedff5a0e95d4d1d57a2e7e8a37316ce122363b0","src/zlib-ng/trees.c":"b5a494db42b84b21d31cfdc86492ee8ded1894f70cf463635be860d65fcc88b0","src/zlib-ng/trees.h":"24174f3543b01ee1ef370bbf6d15551a21871cded18b2aadf09a71e7904b6f99","src/zlib-ng/trees_emit.h":"6c541dcf01eecf393d4eab7800bc558ad524114bb5a8deb86f13376fbef88754","src/zlib-ng/trees_tbl.h":"022736ff3362ef3591d1f8fc3b7fede5927c0d25ab0813d7ef8cd95efd6ea242","src/zlib-ng/uncompr.c":"bb03a6ae65e1395f3cb2fba1dee63246a1fcd30683fd3348e320e789521055a6","src/zlib-ng/zbuild.h":"fb21be3ec8597a960ca9a1083fde1a58a55c1e359cddbd16b46fd586856f5768","src/zlib-ng/zconf-ng.h.in":"ef5b25e964fc2aff0fccac38e412b4d2e30d105d5ee0bfc63e50eb675794f5c9","src/zlib-ng/zconf.h.in":"df1730a639dc0efa42fbc81aff55e09e14843a08b61f5fc30affc22b9df3f275","src/zlib-ng/zendian.h":"5be3e2989524198f13b68cc083b1502747effe92325edee59e3c4ad93cc3c62f","src/zlib-ng/zlib-config.cmake.in":"f906031d0c77404e455f8d348718f28ac37e79e18fa3ac0827ad1e5c321259f5","src/zlib-ng/zlib-ng-config.cmake.in":"a21981baf1ae9fb9589a9c7e11d2972da5cbbc9255361247393337ef2b293eea","src/zlib-ng/zlib-ng.h.in":"3a3dd4edc95fc9f526351044ec6bdc177799849821c7d607e8c9ec92747cd7a8","src/zlib-ng/zlib.h.in":"08da38b67ccd17130eedffb7a4f61914695918bc95c265d8ed579bfdc27b27b0","src/zlib-ng/zlib.pc.cmakein":"a97486fcab3f191d807ec04d4487d6a428053ab452b59687ee1f71cf52b02a31","src/zlib-ng/zlib.pc.in":"848e017a079b14853df8d19699f4edac2304767ef4eb2cf525a06ceb60d301b3","src/zlib-ng/zlib_name_mangling-ng.h.in":"a829fd869339579afe7ce8c1f8a5473598c608f3427c3cbbc1800088d6640e7a","src/zlib-ng/zlib_name_mangling.h.empty":"38e51a846d6c2bd6100298c55328dba4437c08fa1dceda4eb2e06ecb1d142058","src/zlib-ng/zlib_name_mangling.h.in":"16e9ede4821d873647bf105b12e71245d3b7cb79ed318fed0a8ab5aa63b2b4da","src/zlib-ng/zmemory.h":"9af58a7808e197dda7bdc18d1f9bfca6acc322339cd7825830ae8bb0a2c6f666","src/zlib-ng/zutil.c":"af3e88b13d69780a18844704c372011d15a10098a2f713dc7102e4d64f6449a7","src/zlib-ng/zutil.h":"138cdc6c947b9a91b4d79115e324e28f319d4359d472caeb9b8f9263fde30971","src/zlib-ng/zutil_p.h":"cb7a59697185547f6d32d05d169480f6ff18863e48db1cb93a84b0706c578ee2","src/zlib/LICENSE":"845efc77857d485d91fb3e0b884aaa929368c717ae8186b66fe1ed2495753243","src/zlib/adler32.c":"9cd1443a24ff2a3053961695bd432035c58347386a420d3388232376ebabe211","src/zlib/compress.c":"86f802c16a965e7a28737e3730b4e576c5ba40981753967e3e30916f4dc1b4b1","src/zlib/contrib/dotzlib/LICENSE_1_0.txt":"36266a8fd073568394cb81cdb2b124f7fdae2c64c1a7ed09db34b4d22efa2951","src/zlib/crc32.c":"8fd16f0a7714d51c89c2eb37eb98ec15e8a4dc57ba343e7b7398b19144039fda","src/zlib/crc32.h":"9a2223575183ac2ee8a247f20bf3ac066e8bd0140369556bdbdffc777435749e","src/zlib/deflate.c":"3b956337350f94c34987750f785587ef33d9c89ceaebb7c2afb189c956360cbe","src/zlib/deflate.h":"48baf016326d8d5e3e32ac8153cc7e22f854b8e6834830b167b998a7fb1e7989","src/zlib/gzclose.c":"35ea6e991a63095f797d8c4cc25817fac7a7155c2ba7dcdbbf648f7871c7ea40","src/zlib/gzguts.h":"716fa648aca1bb06c219d7b97ad4846d8479206143bc39557bfd8283f5783e04","src/zlib/gzlib.c":"042c2be8ec67ad525a2812e508de7381c6766dde903acf5ae6ac4fa6b541946d","src/zlib/gzread.c":"72e481aca07b0b85a9783237b85dc67ff3a4c1d19878d0cec69f58d38634867b","src/zlib/gzwrite.c":"469b1e58932ea11bdda2a153f6655f7b3c13254240fae157181b49ed1bc93b47","src/zlib/infback.c":"62df9a6dd3eef126f1d81d0ad7a534504610dec44482b0a472b61c93cbab6554","src/zlib/inffast.c":"e6ef64ce5dc0a4cd5c7ad08ceeb2b2a698b8447f6bd156057caeb2edab68c0cb","src/zlib/inffast.h":"05cc5dc9ff1da7b8b52a4bd8bda0d8a5c236a2f39efe84b941516ea13857e6c5","src/zlib/inffixed.h":"237ba710f090e432b62ebf963bee8b302867e9691406b2d3f8ee89ee7bfef9b0","src/zlib/inflate.c":"34c998ce0037c0537c04b03b276f680b945f9b2c9d1e01b287605bd6879f7fd2","src/zlib/inflate.h":"e8d4a51b07694bf48cb91979c19974cf6a5ab0b8a09d26ec0d14df349230673e","src/zlib/inftrees.c":"5d4f335221d2dc76f17abd2577d92c2d7baf68fa6d7f23373b360830493d1563","src/zlib/inftrees.h":"0a0fcaf2ae2fae57426bdc06637270e9bba974f35202cadbdba479d946e6409d","src/zlib/trees.c":"f63c68c16c05fcd196050529d1a0e7657960e4136b9987d90a6ac3e58a964b0f","src/zlib/trees.h":"bb0a9d3ca88ee00c81adb7c636e73b97085f6ef1b52d6d58edbe2b6dc3adeb4d","src/zlib/uncompr.c":"04dca5e31b3b8a17d1806426f66f0c539f4184d657e149d40be07070c6227b52","src/zlib/zconf.h":"f5134250a67d57459234b63858f0d9d3ef8dcc48e9e1028d3f4fdcf6eae677ae","src/zlib/zlib.h":"8a5579af72ea4f427ff00a4150f0ccb3fc5c1e4379f726e101133b1ab9fc600c","src/zlib/zlib.pc.in":"04c01cc2e1a0ed123518b5855f585c93a24526dd88982c414111ea1fc9f07997","src/zlib/zutil.c":"8ced40d8c88588811edd2bdb35b7439983d5e1f8e9e32b8a3b244731f3c317b7","src/zlib/zutil.h":"dddb2dc7a1dc339ecf2c8e089b366f08bb731c0839c7110240d17ce731bb4fea","zng/cc.rs":"97a158aaa45c8ef8902fcdececc56271a1985b9fca05c70bbe801864847c574e","zng/cmake.rs":"0af9a27eace82c80058bb8d393fbb38a5d1b9437215fd831bfe360e2e163c0b1"},"package":"df9b68e50e6e0b26f672573834882eb57759f6db9b3be2ea3c35c91188bb4eaa"}
\ No newline at end of file
diff --git a/crates/libz-sys/Android.bp b/crates/libz-sys/Android.bp
index b96664c..6e12f2f 100644
--- a/crates/libz-sys/Android.bp
+++ b/crates/libz-sys/Android.bp
@@ -18,7 +18,7 @@
     host_supported: true,
     crate_name: "libz_sys",
     cargo_env_compat: true,
-    cargo_pkg_version: "1.1.20",
+    cargo_pkg_version: "1.1.21",
     crate_root: "src/lib.rs",
     edition: "2018",
     features: [
diff --git a/crates/libz-sys/Cargo.toml b/crates/libz-sys/Cargo.toml
index 8177243..b414ab0 100644
--- a/crates/libz-sys/Cargo.toml
+++ b/crates/libz-sys/Cargo.toml
@@ -12,7 +12,7 @@
 [package]
 edition = "2018"
 name = "libz-sys"
-version = "1.1.20"
+version = "1.1.21"
 authors = [
     "Alex Crichton <alex@alexcrichton.com>",
     "Josh Triplett <josh@joshtriplett.org>",
@@ -23,6 +23,7 @@
 include = [
     "LICENSE*",
     "/README.md",
+    "/README-zng.md",
     "build.rs",
     "zng/cc.rs",
     "zng/cmake.rs",
@@ -42,8 +43,11 @@
     "src/zlib-ng/zlib_name_mangling.h.empty",
     "src/zlib-ng/CMakeLists.txt",
     "src/zlib-ng/zlib.pc.cmakein",
+    "src/zlib-ng/zlib-config.cmake.in",
+    "src/zlib-ng/zlib-ng-config.cmake.in",
     "src/zlib-ng/cmake",
 ]
+autolib = false
 autobins = false
 autoexamples = false
 autotests = false
diff --git a/crates/libz-sys/METADATA b/crates/libz-sys/METADATA
index 2e6cf44..823d38b 100644
--- a/crates/libz-sys/METADATA
+++ b/crates/libz-sys/METADATA
@@ -1,17 +1,17 @@
 name: "libz-sys"
 description: "Low-level bindings to the system libz library (also known as zlib)."
 third_party {
-  version: "1.1.20"
+  version: "1.1.21"
   license_type: NOTICE
   last_upgrade_date {
-    year: 2024
-    month: 12
-    day: 21
+    year: 2025
+    month: 1
+    day: 17
   }
   homepage: "https://crates.io/crates/libz-sys"
   identifier {
     type: "Archive"
-    value: "https://static.crates.io/crates/libz-sys/libz-sys-1.1.20.crate"
-    version: "1.1.20"
+    value: "https://static.crates.io/crates/libz-sys/libz-sys-1.1.21.crate"
+    version: "1.1.21"
   }
 }
diff --git a/crates/libz-sys/README-zng.md b/crates/libz-sys/README-zng.md
new file mode 100644
index 0000000..60a8778
--- /dev/null
+++ b/crates/libz-sys/README-zng.md
@@ -0,0 +1,57 @@
+# libz-ng-sys
+
+A library for linking zlib-ng (`libz-ng`) to Rust programs natively, rather
+than in zlib-compat mode.
+
+zlib-ng is a high-performance implementation of zlib. zlib-ng supports building
+in two modes: zlib-compat mode, in which it provides the same API as zlib and
+generally works as a drop-in replacement, and native mode, in which it provides
+its own API. The native API is almost identical to the zlib-compat API, except
+that some types use more correct sizes (rather than the sizes required for zlib
+compatibility), and the functions all have a `zng_` prefix. The latter allows
+zlib and zlib-ng to coexist in the same program.
+
+This crate provides bindings to the native zlib-ng API. However, for simplicity
+of porting, this crate exports the same API as libz-sys (without the `zng_`
+prefixes), making it easier to write Rust software compatible with both
+libz-sys and libz-ng-sys.
+
+# High-level API
+
+This crate provides bindings to the raw low-level C API. For a higher-level
+safe API to work with DEFLATE, zlib, or gzip streams, see
+[`flate2`](https://docs.rs/flate2). `flate2` supports many different
+implementations.
+
+# Development
+
+This crate is built from [the same sources as
+`libz-sys`](https://github.com/rust-lang/libz-sys). From within those sources,
+`Cargo.toml` is the manifest for `libz-sys`, and `Cargo-zng.toml` is the
+manifest for `libz-ng-sys`. The script `./cargo-zng` invokes Cargo on a
+temporary copy of the sources with `Cargo-zng.toml` replacing `Cargo.toml`; for
+instance, use `./cargo-zng publish` to publish `libz-ng-sys`.
+
+# Minimum Supported Rust Version (MSRV) Policy
+
+This crate uses the same MSRV policy as the
+[`flate2`](https://crates.io/crates/flate2) crate: This crate supports the
+current and previous stable versions of Rust. Older versions of Rust may work,
+but we don't guarantee these will continue to work.
+
+# License
+
+This project is licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+   https://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+   https://opensource.org/license/mit/)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
+be dual licensed as above, without any additional terms or conditions.
diff --git a/crates/libz-sys/build.rs b/crates/libz-sys/build.rs
index cab160a..6e17cc8 100644
--- a/crates/libz-sys/build.rs
+++ b/crates/libz-sys/build.rs
@@ -23,9 +23,9 @@
     }
 
     // All android compilers should come with libz by default, so let's just use
-    // the one already there. Likewise, Haiku always ships with libz, so we can
-    // link to it even when cross-compiling.
-    if target.contains("android") || target.contains("haiku") {
+    // the one already there. Likewise, Haiku and OpenHarmony always ship with libz,
+    // so we can link to it even when cross-compiling.
+    if target.contains("android") || target.contains("haiku") || target.ends_with("-ohos") {
         println!("cargo:rustc-link-lib=z");
         return;
     }
@@ -60,7 +60,7 @@
                 }
             }
             Err(e) => {
-                println!("cargo-warning={}", e.to_string())
+                println!("cargo:warning=Could not find zlib include paths via pkg-config: {}", e)
             }
         }
     }
diff --git a/crates/libz-sys/zng/cc.rs b/crates/libz-sys/zng/cc.rs
index 09874e2..c0b365a 100644
--- a/crates/libz-sys/zng/cc.rs
+++ b/crates/libz-sys/zng/cc.rs
@@ -112,14 +112,10 @@
         None,
         &[
             "adler32",
-            "adler32_fold",
-            "chunkset",
-            "compare256",
             "compress",
             "cpu_features",
-            "crc32_braid",
+            "crc32",
             "crc32_braid_comb",
-            "crc32_fold",
             "deflate",
             "deflate_fast",
             "deflate_huff",
@@ -137,13 +133,25 @@
             "inftrees",
             "insert_string",
             "insert_string_roll",
-            "slide_hash",
             "trees",
             "uncompr",
             "zutil",
         ],
     );
 
+    cfg.append(
+        Some("arch/generic"),
+        &[
+            "adler32_c",
+            "adler32_fold_c",
+            "chunkset_c",
+            "compare256_c",
+            "crc32_braid_c",
+            "crc32_fold_c",
+            "slide_hash_c",
+        ],
+    );
+
     if compat {
         cfg.define("ZLIB_COMPAT", None);
     }
@@ -188,7 +196,8 @@
             .flag("-fvisibility=hidden");
     }
 
-    if target.contains("apple") {
+    let is_apple = target.contains("apple");
+    if is_apple {
         cfg.define("_C99_SOURCE", None);
     } else if target.contains("solaris") {
         cfg.define("_XOPEN_SOURCE", "700");
@@ -238,7 +247,7 @@
 
             // SSE4.2
             cfg.define("X86_SSE42", None);
-            cfg.append(Some("arch/x86"), &["adler32_sse42", "insert_string_sse42"]);
+            cfg.append(Some("arch/x86"), &["adler32_sse42"]);
             cfg.mflag("-msse4.2", "/arch:SSE4.2");
 
             // AVX-512
@@ -302,7 +311,7 @@
             // for arm, don't know if that is still true though
             if !cfg.is_msvc || is_aarch64 {
                 cfg.define("ARM_ACLE", None).define("HAVE_ARM_ACLE_H", None);
-                cfg.append(Some("arch/arm"), &["crc32_acle", "insert_string_acle"]);
+                cfg.append(Some("arch/arm"), &["crc32_acle"]);
                 // When targeting aarch64 we already need to specify +simd, so
                 // we do that once later in this block
                 if !is_aarch64 {
@@ -314,7 +323,8 @@
             // neon
             // Fix armv7-unknown-linux-musleabi and arm-unknown-linux-musleabi by only
             // passing in ARM_NEON if that target is enabled.
-            if features.split(",").any(|name| name == "neon") {
+            // Disable for apple targets due to https://github.com/rust-lang/libz-sys/issues/230
+            if !is_apple && features.split(",").any(|name| name == "neon") {
                 cfg.define("ARM_NEON", None);
             }
 
diff --git a/crates/libz-sys/zng/cmake.rs b/crates/libz-sys/zng/cmake.rs
index 2557625..5d6b6eb 100644
--- a/crates/libz-sys/zng/cmake.rs
+++ b/crates/libz-sys/zng/cmake.rs
@@ -14,6 +14,27 @@
             .define("WITH_DFLTCC_INFLATE", "1")
             .cflag("-DDFLTCC_LEVEL_MASK=0x7e");
     }
+    if target.contains("riscv") {
+        // Check if we should pass on an explicit boolean value of the WITH_RVV build option.
+        // See: https://github.com/zlib-ng/zlib-ng?tab=readme-ov-file#advanced-build-options
+        if let Ok(value) = env::var("RISCV_WITH_RVV") {
+            match value.trim().to_uppercase().as_str() {
+                "OFF" | "NO" | "FALSE" | "0" => {
+                    // Force RVV off. This turns off RVV entirely, as well as the runtime check for it.
+                    // This is not usually necessary, but can be useful for building binaries portable
+                    // to systems that do not support RVV but where auto-detection fails to identify
+                    // this (as in https://github.com/zlib-ng/zlib-ng/issues/1705).
+                    cmake.define("WITH_RVV", "OFF");
+                }
+                "ON" | "YES" | "TRUE" | "1" => {
+                    // Try to use RVV, but still don't do so if a runtime check finds it unavailable.
+                    // This has the same effect as omitting WITH_RVV, unless it has already been set.
+                    cmake.define("WITH_RVV", "ON");
+                }
+                _ => {}
+            }
+        }
+    }
     if target == "i686-pc-windows-msvc" {
         cmake.define("CMAKE_GENERATOR_PLATFORM", "Win32");
     }
diff --git a/pseudo_crate/Cargo.lock b/pseudo_crate/Cargo.lock
index 45cde80..14a09da 100644
--- a/pseudo_crate/Cargo.lock
+++ b/pseudo_crate/Cargo.lock
@@ -2946,9 +2946,9 @@
 
 [[package]]
 name = "libz-sys"
-version = "1.1.20"
+version = "1.1.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2d16453e800a8cf6dd2fc3eb4bc99b786a9b90c663b8559a5b1a041bf89e472"
+checksum = "df9b68e50e6e0b26f672573834882eb57759f6db9b3be2ea3c35c91188bb4eaa"
 dependencies = [
  "cc",
  "libc",
diff --git a/pseudo_crate/Cargo.toml b/pseudo_crate/Cargo.toml
index f858156..48292fa 100644
--- a/pseudo_crate/Cargo.toml
+++ b/pseudo_crate/Cargo.toml
@@ -171,7 +171,7 @@
 libm = "=0.2.8"
 libtest-mimic = "=0.6.1"
 libusb1-sys = "=0.7.0"
-libz-sys = "=1.1.20"
+libz-sys = "=1.1.21"
 linked-hash-map = "=0.5.6"
 linkme = "=0.3.31"
 linkme-impl = "=0.3.31"