diff --git a/polbin/Cargo.lock b/polbin/Cargo.lock
index a2620a1e..cd09d52a 100644
--- a/polbin/Cargo.lock
+++ b/polbin/Cargo.lock
@@ -2,21 +2,6 @@
 # It is not intended for manual editing.
 version = 3
 
-[[package]]
-name = "aho-corasick"
-version = "1.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
-dependencies = [
- "memchr",
-]
-
-[[package]]
-name = "anyhow"
-version = "1.0.80"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ad32ce52e4161730f7098c077cd2ed6229b5804ccf99e5366be1ab72a98b4e1"
-
 [[package]]
 name = "argh"
 version = "0.1.12"
@@ -48,27 +33,6 @@ dependencies = [
  "serde",
 ]
 
-[[package]]
-name = "arrayvec"
-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
-
-[[package]]
-name = "bitflags"
-version = "1.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
-
-[[package]]
-name = "bstr"
-version = "0.2.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ba3569f383e8f1598449f1a423e72e99569137b47740b1da11ef19af3d5c3223"
-dependencies = [
- "memchr",
-]
-
 [[package]]
 name = "bstr"
 version = "1.9.1"
@@ -80,66 +44,18 @@ dependencies = [
  "serde",
 ]
 
-[[package]]
-name = "bytemuck"
-version = "1.14.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a2ef034f05691a48569bd920a96c81b9d91bbad1ab5ac7c4616c1f6ef36cb79f"
-dependencies = [
- "bytemuck_derive",
-]
-
-[[package]]
-name = "bytemuck_derive"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "965ab7eb5f8f97d2a083c799f3a1b994fc397b2fe2da5d1da1626ce15a39f2b1"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "byteorder"
 version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
-[[package]]
-name = "cfg-if"
-version = "1.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
-
 [[package]]
 name = "equivalent"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
 
-[[package]]
-name = "fnv"
-version = "1.0.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
-
-[[package]]
-name = "gfa"
-version = "0.10.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9632601a032d2ae43f5050b454dd27c2add69b2e52bd46a4888f3aeb6e3629f5"
-dependencies = [
- "anyhow",
- "bstr 0.2.17",
- "bytemuck",
- "fnv",
- "lazy_static",
- "memmap",
- "nom",
- "regex",
-]
-
 [[package]]
 name = "hashbrown"
 version = "0.14.3"
@@ -156,25 +72,6 @@ dependencies = [
  "hashbrown",
 ]
 
-[[package]]
-name = "lazy_static"
-version = "1.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
-
-[[package]]
-name = "lexical-core"
-version = "0.7.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6607c62aa161d23d17a9072cc5da0be67cdfc89d3afb1e8d9c842bebc2525ffe"
-dependencies = [
- "arrayvec",
- "bitflags",
- "cfg-if",
- "ryu",
- "static_assertions",
-]
-
 [[package]]
 name = "libc"
 version = "0.2.153"
@@ -197,17 +94,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "nom"
-version = "5.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08959a387a676302eebf4ddbcbc611da04285579f76f88ee0506c63b1a61dd4b"
-dependencies = [
- "lexical-core",
- "memchr",
- "version_check",
-]
-
 [[package]]
 name = "num_enum"
 version = "0.7.2"
@@ -234,8 +120,7 @@ name = "polbin"
 version = "0.1.0"
 dependencies = [
  "argh",
- "bstr 1.9.1",
- "gfa",
+ "bstr",
  "memmap",
  "num_enum",
  "zerocopy",
@@ -268,40 +153,11 @@ dependencies = [
  "proc-macro2",
 ]
 
-[[package]]
-name = "regex"
-version = "1.10.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b62dbe01f0b06f9d8dc7d49e05a0785f153b00b2c227856282f671e0318c9b15"
-dependencies = [
- "aho-corasick",
- "memchr",
- "regex-automata",
- "regex-syntax",
-]
-
 [[package]]
 name = "regex-automata"
 version = "0.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "86b83b8b9847f9bf95ef68afb0b8e6cdb80f498442f5179a29fad448fcc1eaea"
-dependencies = [
- "aho-corasick",
- "memchr",
- "regex-syntax",
-]
-
-[[package]]
-name = "regex-syntax"
-version = "0.8.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"
-
-[[package]]
-name = "ryu"
-version = "1.0.17"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e86697c916019a8588c99b5fac3cead74ec0b4b819707a682fd4d23fa0ce1ba1"
 
 [[package]]
 name = "serde"
@@ -323,12 +179,6 @@ dependencies = [
  "syn",
 ]
 
-[[package]]
-name = "static_assertions"
-version = "1.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
-
 [[package]]
 name = "syn"
 version = "2.0.52"
@@ -363,12 +213,6 @@ version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
 
-[[package]]
-name = "version_check"
-version = "0.9.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
-
 [[package]]
 name = "winapi"
 version = "0.3.9"
diff --git a/polbin/Cargo.toml b/polbin/Cargo.toml
index 4ca5c863..b3dba9f6 100644
--- a/polbin/Cargo.toml
+++ b/polbin/Cargo.toml
@@ -6,7 +6,6 @@ edition = "2021"
 [dependencies]
 argh = "0.1.12"
 bstr = "1.9.1"
-gfa = "0.10.1"
 memmap = "0.7.0"
 num_enum = "0.7.2"
 zerocopy = { version = "0.7.32", features = ["derive"] }
diff --git a/polbin/src/gfaline.rs b/polbin/src/gfaline.rs
index 0a2719d3..047224b8 100644
--- a/polbin/src/gfaline.rs
+++ b/polbin/src/gfaline.rs
@@ -210,10 +210,6 @@ fn parse_align(s: &[u8]) -> PartialParseResult<Vec<AlignOp>> {
 }
 
 /// Parse GFA paths' segment lists. These look like `1+,2-,3+`.
-///
-/// The underlying gfa-rs library does not yet parse the actual segments
-/// involved in the path. So we do it ourselves: splitting on commas and
-/// matching the direction.
 pub struct StepsParser<'a> {
     str: &'a [u8],
     index: usize,