diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 40a4d7b2..ff0ddb5c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -52,11 +52,18 @@ jobs:
       - run: rustup target add x86_64-unknown-linux-musl
         if: ${{ matrix.os == 'ubuntu-latest' }}
 
+      - run: pip install cargo-zigbuild
+        if: ${{ matrix.os == 'ubuntu-latest' }}
+
       - run: cargo check --all-targets --all-features
         env:
           RUSTFLAGS: '-D warnings --cfg tokio_unstable' # also update .cargo/config.toml
 
       - run: cargo test
+        if: ${{ matrix.os != 'ubuntu-latest' }}
+
+      - run: cargo-zigbuild test --target x86_64-unknown-linux-gnu.2.17
+        if: ${{ matrix.os == 'ubuntu-latest' }}
 
   lint:
     name: Lint
diff --git a/Cargo.lock b/Cargo.lock
index 3e141b1a..6fb199ed 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -153,19 +153,6 @@ dependencies = [
  "tree-sitter-facade-sg",
 ]
 
-[[package]]
-name = "attohttpc"
-version = "0.30.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "16e2cdb6d5ed835199484bb92bb8b3edd526effe995c61732580439c1a67e2e9"
-dependencies = [
- "base64",
- "http",
- "log",
- "native-tls",
- "url",
-]
-
 [[package]]
 name = "autocfg"
 version = "1.5.0"
@@ -508,22 +495,6 @@ dependencies = [
  "unicode-segmentation",
 ]
 
-[[package]]
-name = "core-foundation"
-version = "0.9.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "91e195e091a93c46f7102ec7818a2aa394e1e1771c3ab4825963fa03e45afb8f"
-dependencies = [
- "core-foundation-sys",
- "libc",
-]
-
-[[package]]
-name = "core-foundation-sys"
-version = "0.8.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
-
 [[package]]
 name = "cpufeatures"
 version = "0.2.17"
@@ -792,17 +763,6 @@ dependencies = [
  "windows-sys 0.61.1",
 ]
 
-[[package]]
-name = "displaydoc"
-version = "0.2.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "97369cbbc041bc366949bc74d34658d6cda5621039731c6310521892a3a20ae0"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.106",
-]
-
 [[package]]
 name = "document-features"
 version = "0.2.11"
@@ -973,37 +933,12 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d9c4f5dac5e15c24eb999c26181a6ca40b39fe946cbe4c263c7209467bc83af2"
 
-[[package]]
-name = "foreign-types"
-version = "0.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
-dependencies = [
- "foreign-types-shared",
-]
-
-[[package]]
-name = "foreign-types-shared"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
-
-[[package]]
-name = "form_urlencoded"
-version = "1.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cb4cb245038516f5f85277875cdaa4f7d2c9a0fa0468de06ed190163b1581fcf"
-dependencies = [
- "percent-encoding",
-]
-
 [[package]]
 name = "fspy"
 version = "0.1.0"
 dependencies = [
  "allocator-api2",
  "anyhow",
- "attohttpc",
  "bincode",
  "bstr",
  "bumpalo",
@@ -1334,130 +1269,12 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
-[[package]]
-name = "http"
-version = "1.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f4a85d31aea989eead29a3aaf9e1115a180df8282431156e533de47660892565"
-dependencies = [
- "bytes",
- "fnv",
- "itoa",
-]
-
-[[package]]
-name = "icu_collections"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "200072f5d0e3614556f94a9930d5dc3e0662a652823904c3a75dc3b0af7fee47"
-dependencies = [
- "displaydoc",
- "potential_utf",
- "yoke",
- "zerofrom",
- "zerovec",
-]
-
-[[package]]
-name = "icu_locale_core"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0cde2700ccaed3872079a65fb1a78f6c0a36c91570f28755dda67bc8f7d9f00a"
-dependencies = [
- "displaydoc",
- "litemap",
- "tinystr",
- "writeable",
- "zerovec",
-]
-
-[[package]]
-name = "icu_normalizer"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "436880e8e18df4d7bbc06d58432329d6458cc84531f7ac5f024e93deadb37979"
-dependencies = [
- "displaydoc",
- "icu_collections",
- "icu_normalizer_data",
- "icu_properties",
- "icu_provider",
- "smallvec 1.15.1",
- "zerovec",
-]
-
-[[package]]
-name = "icu_normalizer_data"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "00210d6893afc98edb752b664b8890f0ef174c8adbb8d0be9710fa66fbbf72d3"
-
-[[package]]
-name = "icu_properties"
-version = "2.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "016c619c1eeb94efb86809b015c58f479963de65bdb6253345c1a1276f22e32b"
-dependencies = [
- "displaydoc",
- "icu_collections",
- "icu_locale_core",
- "icu_properties_data",
- "icu_provider",
- "potential_utf",
- "zerotrie",
- "zerovec",
-]
-
-[[package]]
-name = "icu_properties_data"
-version = "2.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "298459143998310acd25ffe6810ed544932242d3f07083eee1084d83a71bd632"
-
-[[package]]
-name = "icu_provider"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03c80da27b5f4187909049ee2d72f276f0d9f99a42c306bd0131ecfe04d8e5af"
-dependencies = [
- "displaydoc",
- "icu_locale_core",
- "stable_deref_trait",
- "tinystr",
- "writeable",
- "yoke",
- "zerofrom",
- "zerotrie",
- "zerovec",
-]
-
 [[package]]
 name = "ident_case"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
 
-[[package]]
-name = "idna"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b0875f23caa03898994f6ddc501886a45c7d3d62d04d2d90788d47be1b1e4de"
-dependencies = [
- "idna_adapter",
- "smallvec 1.15.1",
- "utf8_iter",
-]
-
-[[package]]
-name = "idna_adapter"
-version = "1.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3acae9609540aa318d1bc588455225fb2085b9ed0c4f6bd0d9d5bcd86f1a0344"
-dependencies = [
- "icu_normalizer",
- "icu_properties",
-]
-
 [[package]]
 name = "indenter"
 version = "0.3.4"
@@ -1629,12 +1446,6 @@ version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "df1d3c3b53da64cf5760482273a98e575c651a67eec7f77df96b5b642de8f039"
 
-[[package]]
-name = "litemap"
-version = "0.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "241eaef5fd12c88705a01fc1066c48c4b36e0dd4377dcdc7ec3942cea7a69956"
-
 [[package]]
 name = "litrs"
 version = "0.4.2"
@@ -1735,23 +1546,6 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
-[[package]]
-name = "native-tls"
-version = "0.2.14"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87de3442987e9dbec73158d5c715e7ad9072fda936bb03d19d7fa10e00520f0e"
-dependencies = [
- "libc",
- "log",
- "openssl",
- "openssl-probe",
- "openssl-sys",
- "schannel",
- "security-framework",
- "security-framework-sys",
- "tempfile",
-]
-
 [[package]]
 name = "nix"
 version = "0.23.2"
@@ -1912,60 +1706,6 @@ version = "1.70.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a4895175b425cb1f87721b59f0f286c2092bd4af812243672510e1ac53e2e0ad"
 
-[[package]]
-name = "openssl"
-version = "0.10.74"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "24ad14dd45412269e1a30f52ad8f0664f0f4f4a89ee8fe28c3b3527021ebb654"
-dependencies = [
- "bitflags 2.10.0",
- "cfg-if",
- "foreign-types",
- "libc",
- "once_cell",
- "openssl-macros",
- "openssl-sys",
-]
-
-[[package]]
-name = "openssl-macros"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a948666b637a0f465e8564c73e89d4dde00d72d4d473cc972f390fc3dcee7d9c"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.106",
-]
-
-[[package]]
-name = "openssl-probe"
-version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d05e27ee213611ffe7d6348b942e8f942b37114c00cc03cec254295a4a17852e"
-
-[[package]]
-name = "openssl-src"
-version = "300.5.3+3.5.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dc6bad8cd0233b63971e232cc9c5e83039375b8586d2312f31fda85db8f888c2"
-dependencies = [
- "cc",
-]
-
-[[package]]
-name = "openssl-sys"
-version = "0.9.110"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0a9f0075ba3c21b09f8e8b2026584b1d18d49388648f2fbbf3c97ea8deced8e2"
-dependencies = [
- "cc",
- "libc",
- "openssl-src",
- "pkg-config",
- "vcpkg",
-]
-
 [[package]]
 name = "option-ext"
 version = "0.2.0"
@@ -2077,12 +1817,6 @@ version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "132dca9b868d927b35b5dd728167b2dee150eb1ad686008fc71ccb298b776fca"
 
-[[package]]
-name = "percent-encoding"
-version = "2.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"
-
 [[package]]
 name = "petgraph"
 version = "0.8.3"
@@ -2186,15 +1920,6 @@ dependencies = [
  "winreg",
 ]
 
-[[package]]
-name = "potential_utf"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "84df19adbe5b5a0782edcab45899906947ab039ccf4573713735ee7de1e6b08a"
-dependencies = [
- "zerovec",
-]
-
 [[package]]
 name = "ppv-lite86"
 version = "0.2.21"
@@ -2511,15 +2236,6 @@ dependencies = [
  "winapi-util",
 ]
 
-[[package]]
-name = "schannel"
-version = "0.1.28"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "891d81b926048e76efe18581bf793546b4c0eaf8448d72be8de2bbee5fd166e1"
-dependencies = [
- "windows-sys 0.61.1",
-]
-
 [[package]]
 name = "scopeguard"
 version = "1.2.0"
@@ -2534,29 +2250,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "security-framework"
-version = "2.11.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "897b2245f0b511c87893af39b033e5ca9cce68824c4d7e7630b5a1d339658d02"
-dependencies = [
- "bitflags 2.10.0",
- "core-foundation",
- "core-foundation-sys",
- "libc",
- "security-framework-sys",
-]
-
-[[package]]
-name = "security-framework-sys"
-version = "2.15.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cc1f0cbffaac4852523ce30d8bd3c5cdc873501d96ff467ca09b6767bb8cd5c0"
-dependencies = [
- "core-foundation-sys",
- "libc",
-]
-
 [[package]]
 name = "semver"
 version = "0.9.0"
@@ -2783,12 +2476,6 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
-[[package]]
-name = "stable_deref_trait"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
-
 [[package]]
 name = "stackalloc"
 version = "1.2.1"
@@ -2870,17 +2557,6 @@ dependencies = [
  "unicode-ident",
 ]
 
-[[package]]
-name = "synstructure"
-version = "0.13.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "728a70f3dbaf5bab7f0c4b1ac8d7ae5ea60a4b5549c8a5914361c99147a709d2"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.106",
-]
-
 [[package]]
 name = "syscalls"
 version = "0.6.18"
@@ -2982,16 +2658,6 @@ dependencies = [
  "cfg-if",
 ]
 
-[[package]]
-name = "tinystr"
-version = "0.8.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5d4f6d1145dcb577acf783d4e601bc1d76a13337bb54e6233add580b07344c8b"
-dependencies = [
- "displaydoc",
- "zerovec",
-]
-
 [[package]]
 name = "tokio"
 version = "1.48.0"
@@ -3270,18 +2936,6 @@ version = "0.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6d49784317cd0d1ee7ec5c716dd598ec5b4483ea832a2dced265471cc0f690ae"
 
-[[package]]
-name = "url"
-version = "2.5.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08bc136a29a3d1758e07a9cca267be308aeebf5cfd5a10f3f67ab2097683ef5b"
-dependencies = [
- "form_urlencoded",
- "idna",
- "percent-encoding",
- "serde",
-]
-
 [[package]]
 name = "utf8-chars"
 version = "3.0.5"
@@ -3291,12 +2945,6 @@ dependencies = [
  "arrayvec",
 ]
 
-[[package]]
-name = "utf8_iter"
-version = "1.0.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b6c140620e7ffbb22c2dee59cafe6084a59b5ffc27a8859a5f0d494b5d52b6be"
-
 [[package]]
 name = "utf8parse"
 version = "0.2.2"
@@ -3943,12 +3591,6 @@ version = "0.46.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f17a85883d4e6d00e8a97c586de764dabcc06133f7f1d55dce5cdc070ad7fe59"
 
-[[package]]
-name = "writeable"
-version = "0.6.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ea2f10b9bb0928dfb1b42b65e1f9e36f7f54dbdf08457afefb38afcdec4fa2bb"
-
 [[package]]
 name = "xattr"
 version = "1.6.1"
@@ -3971,30 +3613,6 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cfe53a6657fd280eaa890a3bc59152892ffa3e30101319d168b781ed6529b049"
 
-[[package]]
-name = "yoke"
-version = "0.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5f41bb01b8226ef4bfd589436a297c53d118f65921786300e427be8d487695cc"
-dependencies = [
- "serde",
- "stable_deref_trait",
- "yoke-derive",
- "zerofrom",
-]
-
-[[package]]
-name = "yoke-derive"
-version = "0.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "38da3c9736e16c5d3c8c597a9aaa5d1fa565d0532ae05e27c24aa62fb32c0ab6"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.106",
- "synstructure",
-]
-
 [[package]]
 name = "zerocopy"
 version = "0.8.27"
@@ -4014,57 +3632,3 @@ dependencies = [
  "quote",
  "syn 2.0.106",
 ]
-
-[[package]]
-name = "zerofrom"
-version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50cc42e0333e05660c3587f3bf9d0478688e15d870fab3346451ce7f8c9fbea5"
-dependencies = [
- "zerofrom-derive",
-]
-
-[[package]]
-name = "zerofrom-derive"
-version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d71e5d6e06ab090c67b5e44993ec16b72dcbaabc526db883a360057678b48502"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.106",
- "synstructure",
-]
-
-[[package]]
-name = "zerotrie"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "36f0bbd478583f79edad978b407914f61b2972f5af6fa089686016be8f9af595"
-dependencies = [
- "displaydoc",
- "yoke",
- "zerofrom",
-]
-
-[[package]]
-name = "zerovec"
-version = "0.11.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e7aa2bd55086f1ab526693ecbe444205da57e25f4489879da80635a46d90e73b"
-dependencies = [
- "yoke",
- "zerofrom",
- "zerovec-derive",
-]
-
-[[package]]
-name = "zerovec-derive"
-version = "0.11.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b96237efa0c878c64bd89c436f661be4e46b2f3eff1ebb976f7ef2321d2f58f"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.106",
-]
diff --git a/Cargo.toml b/Cargo.toml
index 0c610c9f..4f4e55c5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -37,7 +37,6 @@ anyhow = "1.0.98"
 assert2 = "0.3.16"
 assertables = "9.8.1"
 ast-grep-core = "0.32.2"
-attohttpc = { version = "0.30.1", features = ["tls-native", "tls-native-vendored"], default-features = false }
 base64 = "0.22.1"
 bincode = "2.0.1"
 bindgen = "0.72.1"
diff --git a/crates/fspy/Cargo.toml b/crates/fspy/Cargo.toml
index bd517ca2..5703ef4b 100644
--- a/crates/fspy/Cargo.toml
+++ b/crates/fspy/Cargo.toml
@@ -57,7 +57,6 @@ fspy_test_bin = { path = "../fspy_test_bin", artifact = "bin", target = "x86_64-
 
 [build-dependencies]
 anyhow = { workspace = true }
-attohttpc = { workspace = true }
 flate2 = { workspace = true }
 tar = { workspace = true }
 xxhash-rust = { workspace = true, features = ["xxh3"] }
diff --git a/crates/fspy/build.rs b/crates/fspy/build.rs
index de82dabb..5a612e40 100644
--- a/crates/fspy/build.rs
+++ b/crates/fspy/build.rs
@@ -1,19 +1,28 @@
 use std::{
     env::{self, current_dir},
     fs,
-    io::Read,
+    io::{Cursor, Read},
     path::Path,
+    process::{Command, Stdio},
 };
 
 use anyhow::{Context, bail};
 use xxhash_rust::xxh3::xxh3_128;
 
 fn download(url: &str) -> anyhow::Result<impl Read + use<>> {
-    let resp = attohttpc::get(url).send()?;
-    if resp.status() != attohttpc::StatusCode::OK {
-        bail!("non-ok response: {:?}", resp.status())
-    }
-    Ok(resp)
+    let curl = Command::new("curl")
+        .args([
+            "-f", // fail on HTTP errors
+            "-L", // follow redirects
+            url,
+        ])
+        .stdout(Stdio::piped())
+        .spawn()?;
+    let output = curl.wait_with_output()?;
+    if !output.status.success() {
+        bail!("curl exited with status {} trying to download {}", output.status, url);
+    };
+    Ok(Cursor::new(output.stdout))
 }
 
 fn unpack_tar_gz(content: impl Read, path: &str) -> anyhow::Result<Vec<u8>> {