diff --git a/Cargo.lock b/Cargo.lock
index 1490ba9..00f5c27 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -214,14 +214,13 @@ dependencies = [
 
 [[package]]
 name = "epub2mdbook"
-version = "0.4.0"
+version = "0.5.0"
 dependencies = [
  "clap",
  "epub",
  "html2md",
  "regex",
  "thiserror 2.0.11",
- "url",
 ]
 
 [[package]]
@@ -240,15 +239,6 @@ dependencies = [
  "miniz_oxide",
 ]
 
-[[package]]
-name = "form_urlencoded"
-version = "1.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e13624c2627564efccf4934284bdd98cbaa14e79b0b5a141218e507b3a823456"
-dependencies = [
- "percent-encoding",
-]
-
 [[package]]
 name = "futf"
 version = "0.1.5"
@@ -299,145 +289,6 @@ dependencies = [
  "syn",
 ]
 
-[[package]]
-name = "icu_collections"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db2fa452206ebee18c4b5c2274dbf1de17008e874b4dc4f0aea9d01ca79e4526"
-dependencies = [
- "displaydoc",
- "yoke",
- "zerofrom",
- "zerovec",
-]
-
-[[package]]
-name = "icu_locid"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13acbb8371917fc971be86fc8057c41a64b521c184808a698c02acc242dbf637"
-dependencies = [
- "displaydoc",
- "litemap",
- "tinystr",
- "writeable",
- "zerovec",
-]
-
-[[package]]
-name = "icu_locid_transform"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "01d11ac35de8e40fdeda00d9e1e9d92525f3f9d887cdd7aa81d727596788b54e"
-dependencies = [
- "displaydoc",
- "icu_locid",
- "icu_locid_transform_data",
- "icu_provider",
- "tinystr",
- "zerovec",
-]
-
-[[package]]
-name = "icu_locid_transform_data"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fdc8ff3388f852bede6b579ad4e978ab004f139284d7b28715f773507b946f6e"
-
-[[package]]
-name = "icu_normalizer"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "19ce3e0da2ec68599d193c93d088142efd7f9c5d6fc9b803774855747dc6a84f"
-dependencies = [
- "displaydoc",
- "icu_collections",
- "icu_normalizer_data",
- "icu_properties",
- "icu_provider",
- "smallvec",
- "utf16_iter",
- "utf8_iter",
- "write16",
- "zerovec",
-]
-
-[[package]]
-name = "icu_normalizer_data"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f8cafbf7aa791e9b22bec55a167906f9e1215fd475cd22adfcf660e03e989516"
-
-[[package]]
-name = "icu_properties"
-version = "1.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "93d6020766cfc6302c15dbbc9c8778c37e62c14427cb7f6e601d849e092aeef5"
-dependencies = [
- "displaydoc",
- "icu_collections",
- "icu_locid_transform",
- "icu_properties_data",
- "icu_provider",
- "tinystr",
- "zerovec",
-]
-
-[[package]]
-name = "icu_properties_data"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "67a8effbc3dd3e4ba1afa8ad918d5684b8868b3b26500753effea8d2eed19569"
-
-[[package]]
-name = "icu_provider"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ed421c8a8ef78d3e2dbc98a973be2f3770cb42b606e3ab18d6237c4dfde68d9"
-dependencies = [
- "displaydoc",
- "icu_locid",
- "icu_provider_macros",
- "stable_deref_trait",
- "tinystr",
- "writeable",
- "yoke",
- "zerofrom",
- "zerovec",
-]
-
-[[package]]
-name = "icu_provider_macros"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ec89e9337638ecdc08744df490b221a7399bf8d164eb52a665454e60e075ad6"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
-[[package]]
-name = "idna"
-version = "1.0.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "686f825264d630750a544639377bae737628043f20d38bbc029e8f29ea968a7e"
-dependencies = [
- "idna_adapter",
- "smallvec",
- "utf8_iter",
-]
-
-[[package]]
-name = "idna_adapter"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "daca1df1c957320b2cf139ac61e7bd64fed304c5040df000a745aa1de3b4ef71"
-dependencies = [
- "icu_normalizer",
- "icu_properties",
-]
-
 [[package]]
 name = "indexmap"
 version = "2.7.1"
@@ -486,12 +337,6 @@ version = "0.2.169"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5aba8db14291edd000dfcc4d620c7ebfb122c613afb886ca8803fa4e128a20a"
 
-[[package]]
-name = "litemap"
-version = "0.7.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ee93343901ab17bd981295f2cf0026d4ad018c7c31ba84549a4ddbb47a45104"
-
 [[package]]
 name = "lock_api"
 version = "0.4.12"
@@ -548,9 +393,9 @@ checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
 [[package]]
 name = "miniz_oxide"
-version = "0.8.4"
+version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b3b1c9bd4fe1f0f8b387f6eb9eb3b4a1aa26185e5750efb9140301703f62cd1b"
+checksum = "8e3e04debbb59698c15bacbb6d93584a8c0ca9cc3213cb423d31f760d8843ce5"
 dependencies = [
  "adler2",
 ]
@@ -705,9 +550,9 @@ checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 
 [[package]]
 name = "redox_syscall"
-version = "0.5.8"
+version = "0.5.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "03a862b389f93e68874fbf580b9de08dd02facb9a788ebadaf4a3fd33cf58834"
+checksum = "82b568323e98e49e2a0899dcee453dd679fae22d69adf9b11dd508d1549b7e2f"
 dependencies = [
  "bitflags",
 ]
@@ -788,12 +633,6 @@ version = "1.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7fcf8323ef1faaee30a44a340193b1ac6814fd9b7b4e88e9d4519a3e4abe1cfd"
 
-[[package]]
-name = "stable_deref_trait"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
-
 [[package]]
 name = "string_cache"
 version = "0.8.8"
@@ -836,17 +675,6 @@ dependencies = [
  "unicode-ident",
 ]
 
-[[package]]
-name = "synstructure"
-version = "0.13.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c8af7666ab7b6390ab78131fb5b0fce11d6b7a6951602017c35fa82800708971"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "tendril"
 version = "0.4.3"
@@ -898,16 +726,6 @@ dependencies = [
  "syn",
 ]
 
-[[package]]
-name = "tinystr"
-version = "0.7.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9117f5d4db391c1cf6927e7bea3db74b9a1c1add8f7eda9ffd5364f40f57b82f"
-dependencies = [
- "displaydoc",
- "zerovec",
-]
-
 [[package]]
 name = "toml_datetime"
 version = "0.6.8"
@@ -931,35 +749,12 @@ version = "1.0.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "00e2473a93778eb0bad35909dff6a10d28e63f792f16ed15e404fca9d5eeedbe"
 
-[[package]]
-name = "url"
-version = "2.5.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "32f8b686cadd1473f4bd0117a5d28d36b1ade384ea9b5069a1c40aefed7fda60"
-dependencies = [
- "form_urlencoded",
- "idna",
- "percent-encoding",
-]
-
 [[package]]
 name = "utf-8"
 version = "0.7.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "09cc8ee72d2a9becf2f2febe0205bbed8fc6615b7cb429ad062dc7b7ddd036a9"
 
-[[package]]
-name = "utf16_iter"
-version = "1.0.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c8232dd3cdaed5356e0f716d285e4b40b932ac434100fe9b7e0e8e935b9e6246"
-
-[[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"
@@ -1067,18 +862,6 @@ dependencies = [
  "memchr",
 ]
 
-[[package]]
-name = "write16"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d1890f4022759daae28ed4fe62859b1236caebfc61ede2f63ed4e695f3f6d936"
-
-[[package]]
-name = "writeable"
-version = "0.5.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e9df38ee2d2c3c5948ea468a8406ff0db0b29ae1ffde1bcf20ef305bcc95c51"
-
 [[package]]
 name = "xml-rs"
 version = "0.8.25"
@@ -1096,73 +879,6 @@ dependencies = [
  "markup5ever",
 ]
 
-[[package]]
-name = "yoke"
-version = "0.7.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "120e6aef9aa629e3d4f52dc8cc43a015c7724194c97dfaf45180d2daf2b77f40"
-dependencies = [
- "serde",
- "stable_deref_trait",
- "yoke-derive",
- "zerofrom",
-]
-
-[[package]]
-name = "yoke-derive"
-version = "0.7.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2380878cad4ac9aac1e2435f3eb4020e8374b5f13c296cb75b4620ff8e229154"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
- "synstructure",
-]
-
-[[package]]
-name = "zerofrom"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cff3ee08c995dee1859d998dea82f7374f2826091dd9cd47def953cae446cd2e"
-dependencies = [
- "zerofrom-derive",
-]
-
-[[package]]
-name = "zerofrom-derive"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "595eed982f7d355beb85837f651fa22e90b3c044842dc7f2c2842c086f295808"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
- "synstructure",
-]
-
-[[package]]
-name = "zerovec"
-version = "0.10.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aa2b893d79df23bfb12d5461018d408ea19dfafe76c2c7ef6d4eba614f8ff079"
-dependencies = [
- "yoke",
- "zerofrom",
- "zerovec-derive",
-]
-
-[[package]]
-name = "zerovec-derive"
-version = "0.10.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6eafa6dfb17584ea3e2bd6e76e0cc15ad7af12b09abdd1ca55961bed9b1063c6"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "zip"
 version = "1.1.4"
diff --git a/Cargo.toml b/Cargo.toml
index c64d5c4..bcc676b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "epub2mdbook"
-version = "0.4.0"
+version = "0.5.0"
 edition = "2024"
 description = "A tool to convert EPUB files to MDBook format"
 authors = ["Maverick Liu <maverick.liu42@gmail.com>"]
@@ -15,4 +15,3 @@ epub = "2.1.1"
 html2md = "0.2.15"
 regex = "1.11.1"
 thiserror = "2.0.11"
-url = "2.5.4"
diff --git a/src/lib.rs b/src/lib.rs
index b63ecb6..23d2230 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -123,7 +123,7 @@ fn extract_chapters_and_resources<R: Read + Seek>(
             if let Some(parent) = target_path.parent() {
                 fs::create_dir_all(parent)?;
             }
-            let html = String::from_utf8(content.clone())?;
+            let html = String::from_utf8(content)?;
             let markdown = html2md::parse_html(&html);
             let markdown = post_process_md(&markdown, html_to_md);
             fs::write(target_path, markdown)?;
@@ -144,28 +144,25 @@ fn extract_chapters_and_resources<R: Read + Seek>(
 /// [ABC]({abc.html}#xxx)
 /// [ABC]({abc.html})
 /// ```
-static LINK_REGEX: LazyLock<Regex> =
+static LINK: LazyLock<Regex> =
     LazyLock::new(|| Regex::new(r#"\[[^\]]+\]\(([^#)]+)(?:#[^)]+)?\)"#).expect("unreachable"));
-
-/// Capture the empty links, eg:
-/// ```
-/// [{ABC}]()
-/// ```
-static EMPTY_LINK_REGEX: LazyLock<Regex> =
+static EMPTY_LINK: LazyLock<Regex> =
     LazyLock::new(|| Regex::new(r#"\[([^\]]+)\]\(\)"#).expect("unreachable"));
-
+static URL_LINK: LazyLock<Regex> =
+    LazyLock::new(|| Regex::new(r"^[a-z][a-z0-9+.-]*:").expect("unreachable"));
 fn post_process_md(markdown: &str, html_to_md: &HashMap<PathBuf, PathBuf>) -> String {
     let file_name_map = html_to_md
         .iter()
         .filter_map(|(k, v)| Some((k.file_name()?, v.file_name()?)))
         .collect::<HashMap<_, _>>();
 
-    let markdown = LINK_REGEX
+    let markdown = LINK
         .replace_all(markdown, |caps: &Captures| {
             // replace [ABC](abc.html#xxx) to [ABC](abc.md#xxx)
             let origin = &caps[0];
             let link = &caps[1];
-            if url::Url::parse(link).is_ok() {
+            // Don't modify links with schemes like `https`.
+            if URL_LINK.is_match(link) {
                 return origin.to_string();
             }
             let link = match Path::new(&link).file_name() {
@@ -184,7 +181,7 @@ fn post_process_md(markdown: &str, html_to_md: &HashMap<PathBuf, PathBuf>) -> St
         .replace(r"![]()", "")
         .replace(r"[]()", "");
 
-    EMPTY_LINK_REGEX
+    EMPTY_LINK
         .replace_all(&markdown, |caps: &Captures| caps[1].to_string())
         .to_string()
 }
@@ -210,7 +207,7 @@ mod tests {
     #[test]
     fn test_replace_links() {
         let markdown = r"[hello](hello.html#xxx) [hi](hi.xhtml)";
-        let markdown = LINK_REGEX.replace_all(&markdown, |caps: &Captures| {
+        let markdown = LINK.replace_all(&markdown, |caps: &Captures| {
             let link = caps[1].to_string();
             caps[0].replace(&link, "hello.md")
         });