diff --git a/Cargo.lock b/Cargo.lock
index c3be9fc..8de2fe0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -107,15 +107,6 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
-[[package]]
-name = "arbitrary"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c3d036a3c4ab069c7b410a2ce876bd74808d2d0888a82667669f8e783a898bf1"
-dependencies = [
- "derive_arbitrary",
-]
-
 [[package]]
 name = "arrayvec"
 version = "0.7.8"
@@ -203,6 +194,12 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801"
 
+[[package]]
+name = "cfg_aliases"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f079e83a288787bcd14a6aea84cee5c87a67c5a3e660c30f557a3d24761b3527"
+
 [[package]]
 name = "chrono"
 version = "0.4.44"
@@ -350,12 +347,6 @@ dependencies = [
  "cfg-if",
 ]
 
-[[package]]
-name = "crossbeam-utils"
-version = "0.8.21"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d0a5c400df2834b80a4c3327b3aad3a4c4cd4de0629063962b03235697506a28"
-
 [[package]]
 name = "crossterm"
 version = "0.29.0"
@@ -453,17 +444,6 @@ dependencies = [
  "powerfmt",
 ]
 
-[[package]]
-name = "derive_arbitrary"
-version = "1.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e567bd82dcff979e4b03460c307b3cdc9e96fde3d73bed1496d2bc75d9dd62a"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn 2.0.117",
-]
-
 [[package]]
 name = "difflib"
 version = "0.4.0"
@@ -581,6 +561,7 @@ checksum = "843fba2746e448b37e26a819579957415c8cef339bf08564fe8b7ddbd959573c"
 dependencies = [
  "crc32fast",
  "miniz_oxide",
+ "zlib-rs",
 ]
 
 [[package]]
@@ -987,9 +968,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.182"
+version = "0.2.190"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6800badb6cb2082ffd7b6a67e6125bb39f18782f793520caee8cb8846be06112"
+checksum = "ce5d3ddc6d3fa000eb1536d85e147bfe31aacaba692ed6a876f95cb7c855be78"
 
 [[package]]
 name = "libredox"
@@ -1066,6 +1047,18 @@ dependencies = [
  "simd-adler32",
 ]
 
+[[package]]
+name = "nix"
+version = "0.31.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf20d2fde8ff38632c426f1165ed7436270b44f199fc55284c38276f9db47c3d"
+dependencies = [
+ "bitflags",
+ "cfg-if",
+ "cfg_aliases",
+ "libc",
+]
+
 [[package]]
 name = "nom"
 version = "7.1.3"
@@ -1820,6 +1813,12 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "typed-path"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e28f89b80c87b8fb0cf04ab448d5dd0dd0ade2f8891bae878de66a75a28600e"
+
 [[package]]
 name = "typenum"
 version = "1.19.0"
@@ -2364,21 +2363,25 @@ dependencies = [
 
 [[package]]
 name = "zip"
-version = "2.4.2"
+version = "9.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fabe6324e908f85a1c52063ce7aa26b68dcb7eb6dbc83a2d148403c9bc3eba50"
+checksum = "a954114b47a54df49f83d2722814e86b23d4bb1b54a1b90fb7d92b41619ddc22"
 dependencies = [
- "arbitrary",
  "crc32fast",
- "crossbeam-utils",
- "displaydoc",
  "flate2",
  "indexmap",
  "memchr",
- "thiserror 2.0.18",
+ "nix",
+ "typed-path",
  "zopfli",
 ]
 
+[[package]]
+name = "zlib-rs"
+version = "0.6.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b268e58e7c693d7c271f93ffc4ba3b380412554231c85bf61ca7af91042a4112"
+
 [[package]]
 name = "zmij"
 version = "1.0.21"
diff --git a/Cargo.toml b/Cargo.toml
index 59b3c94..ff3f403 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,4 +20,4 @@ chrono = { version = "0.4", features = ["serde"] }
 ureq = { version = "3", features = ["json", "cookies"] }
 rusqlite = { version = "0.32", features = ["bundled-full"] }
 sha2 = "0.10"
-zip = { version = "2", default-features = false, features = ["deflate"] }
+zip = { version = "9", default-features = false, features = ["deflate"] }
diff --git a/crates/idx-core/src/ownership/archive.rs b/crates/idx-core/src/ownership/archive.rs
index f883c47..d042308 100644
--- a/crates/idx-core/src/ownership/archive.rs
+++ b/crates/idx-core/src/ownership/archive.rs
@@ -172,7 +172,10 @@ fn extract_txt_from_zip(path: &Path) -> Result<String, IdxError> {
             continue;
         }
 
-        let name = file.name().to_ascii_lowercase();
+        // An undecodable entry name cannot be the TXT payload.
+        let Ok(name) = file.name().map(|name| name.to_ascii_lowercase()) else {
+            continue;
+        };
         if !name.ends_with(".txt") {
             continue;
         }
diff --git a/crates/idx-core/src/ownership/xlsx.rs b/crates/idx-core/src/ownership/xlsx.rs
index c8650d9..58751f8 100644
--- a/crates/idx-core/src/ownership/xlsx.rs
+++ b/crates/idx-core/src/ownership/xlsx.rs
@@ -87,11 +87,13 @@ fn read_zip_entry(
 }
 
 fn first_worksheet_name(zip: &mut zip::ZipArchive<Cursor<&[u8]>>) -> Result<String, IdxError> {
+    // Undecodable entry names cannot be worksheets; skip them.
     let mut sheets: Vec<String> = zip
         .file_names()
+        .filter_map(Result::ok)
         .filter(|name| name.starts_with("xl/worksheets/") && name.ends_with(".xml"))
         .filter(|name| !name["xl/worksheets/".len()..].contains('/'))
-        .map(str::to_string)
+        .map(|name| name.into_owned())
         .collect();
     // sheet1.xml, sheet2.xml, ... sort by their numeric suffix.
     sheets.sort_by_key(|name| {