diff --git a/Cargo.lock b/Cargo.lock
index de849b7..d6eae30 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,66 +2,15 @@
 # It is not intended for manual editing.
 version = 3
 
-[[package]]
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-version = "1.0.53"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "94a45b455c14666b85fc40a019e8ab9eb75e3a124e05494f5397122bc9eb06e0"
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-
 [[package]]
 name = "block-buffer"
-version = "0.7.3"
+version = "0.10.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c0940dc441f31689269e10ac70eb1002a3a1d3ad1390e030043662eb7fe4688b"
+checksum = "3078c7629b62d3f0439517fa394996acacc5cbc91c5a20d8c658e77abd503a71"
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- "byte-tools",
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 [[package]]
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@@ -69,126 +18,51 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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 [[package]]
-name = "chrono"
-version = "0.4.19"
+name = "cpufeatures"
+version = "0.2.12"
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-checksum = "670ad68c9088c2a963aaa298cb369688cf3f9465ce5e2d4ca10e6e0098a1ce73"
+checksum = "53fe5e26ff1b7aef8bca9c6080520cfb8d9333c7568e1829cef191a9723e5504"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1bfb12502f3fc46cca1bb51ac28df9d618d813cdc3d2f25b9fe775a34af26bb3"
+dependencies = [
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+checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
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@@ -199,100 +73,38 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
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+ "thiserror",
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@@ -300,9 +112,9 @@ dependencies = [
 
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@@ -313,235 +125,95 @@ dependencies = [
 
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-dependencies = [
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+checksum = "793db75ad2bcafc3ffa7c68b215fee268f537982cd901d132f89c6343f3a3dc8"
 dependencies = [
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+ "cfg-if",
+ "cpufeatures",
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- "opaque-debug",
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 dependencies = [
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 [[package]]
 name = "version_check"
 version = "0.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
-
-[[package]]
-name = "wasi"
-version = "0.10.0+wasi-snapshot-preview1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
-
-[[package]]
-name = "winapi"
-version = "0.3.9"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
-dependencies = [
- "winapi-i686-pc-windows-gnu",
- "winapi-x86_64-pc-windows-gnu",
-]
-
-[[package]]
-name = "winapi-i686-pc-windows-gnu"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
-
-[[package]]
-name = "winapi-x86_64-pc-windows-gnu"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/Cargo.toml b/Cargo.toml
index deb1750..8a5789a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,13 +2,8 @@
 name = "fox32asm"
 version = "0.3.0"
 edition = "2021"
-build = "build.rs"
 
 [dependencies]
 lazy_static = "1.4.0"
 pest = "2.1.3"
 pest_derive = "2.1.0"
-
-[build-dependencies]
-anyhow = "1.0"
-vergen = { version = "6", default-features = false, features = ["build", "git"] }
diff --git a/build.rs b/build.rs
deleted file mode 100644
index d4fafec..0000000
--- a/build.rs
+++ /dev/null
@@ -1,8 +0,0 @@
-use anyhow::Result;
-use vergen::{Config, ShaKind, vergen};
-
-fn main() -> Result<()> {
-    let mut config = Config::default();
-    *config.git_mut().sha_kind_mut() = ShaKind::Short;
-    vergen(config)
-}
diff --git a/flake.nix b/flake.nix
index 1f4f9aa..bafc820 100644
--- a/flake.nix
+++ b/flake.nix
@@ -10,14 +10,17 @@
       let pkgs = import nixpkgs { system = sys; };
 
       in rec {
-        packages.default = pkgs.rustPlatform.buildRustPackage {
-          name = "fox32asm";
+        packages.fox32asm = pkgs.rustPlatform.buildRustPackage rec {
+          pname = "fox32asm";
+          version = "0.3.0";
+
           src = ./. ;
           cargoLock = { lockFile = ./Cargo.lock; };
 
           NIX_SEMVER = version;
           NIX_GIT_SHA_SHORT = if self ? rev then self.rev else "dirty";
         };
+        packages.default = packages.fox32asm;
       }
     );
 }
diff --git a/src/main.rs b/src/main.rs
index 8e85925..5811857 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -337,7 +337,7 @@ fn format_address_table(m: &HashMap<String, (u32, bool)>) -> String {
 }
 
 fn main() {
-    let version_string = format!("fox32asm {} ({})", env!("VERGEN_BUILD_SEMVER"), env!("VERGEN_GIT_SHA_SHORT"));
+    let version_string = format!("fox32asm {} ({})", env!("NIX_SEMVER"), env!("NIX_GIT_SHA_SHORT"));
     println!("{}", version_string);
 
     let args: Vec<String> = env::args().collect();
@@ -1504,4 +1504,4 @@ fn optimize_node(node: AstNode, enabled: &mut bool) -> AstNode {
     } else {
         node
     }
-}
\ No newline at end of file
+}