diff --git a/.gitignore b/.gitignore
index 24a2efb..4d2be69 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,13 +7,17 @@
 /spec/reports/
 /tmp/
 
+*.bundle
+*.so
+*.o
+*.a
+mkmf.log
+
 # rspec failure tracking
 .rspec_status
 
-
 # Added by cargo
-
 /target
 
-# Build gems
+# Built gems
 *.gem
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 749026b..51e36ea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## [Unreleased]
 
+## [0.2.0] - 2023-02-22
+
+- Migrate to [magnus](https://github.com/matsadler/magnus)
+
 ## [0.1.0] - 2023-02-21
 
 - Initial release
diff --git a/Cargo.lock b/Cargo.lock
index 8e3096b..0cb988e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -29,6 +29,15 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "aho-corasick"
+version = "0.7.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc936419f96fa211c1b9166887b38e5e40b19958e5b895be7c1f93adec7071ac"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.69"
@@ -62,6 +71,25 @@ dependencies = [
  "rustc-demangle",
 ]
 
+[[package]]
+name = "bindgen"
+version = "0.60.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "062dddbc1ba4aca46de6338e2bf87771414c335f7b2f2036e8f3e9befebf88e6"
+dependencies = [
+ "bitflags",
+ "cexpr",
+ "clang-sys",
+ "lazy_static",
+ "lazycell",
+ "peeking_take_while",
+ "proc-macro2",
+ "quote",
+ "regex",
+ "rustc-hash",
+ "shlex",
+]
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -86,6 +114,15 @@ version = "1.0.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
 
+[[package]]
+name = "cexpr"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6fac387a98bb7c37292057cffc56d62ecb629900026402633ae9160df93a8766"
+dependencies = [
+ "nom",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -104,6 +141,17 @@ dependencies = [
  "serde_json",
 ]
 
+[[package]]
+name = "clang-sys"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77ed9a53e5d4d9c573ae844bfac6872b159cb1d1585a83b29e7a64b7eef7332a"
+dependencies = [
+ "glob",
+ "libc",
+ "libloading",
+]
+
 [[package]]
 name = "clap"
 version = "4.1.6"
@@ -248,6 +296,12 @@ version = "0.27.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ad0a93d233ebf96623465aad4046a8d3aa4da22d4f4beba5388838c8a434bbb4"
 
+[[package]]
+name = "glob"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d2fabcfbdc87f4758337ca535fb41a6d701b65693ce38287d856d1674551ec9b"
+
 [[package]]
 name = "hashbrown"
 version = "0.12.3"
@@ -346,12 +400,28 @@ version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
+[[package]]
+name = "lazycell"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
+
 [[package]]
 name = "libc"
 version = "0.2.139"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"
 
+[[package]]
+name = "libloading"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b67380fd3b2fbe7527a606e18729d21c6f3951633d0500574c4dc22d2d638b9f"
+dependencies = [
+ "cfg-if",
+ "winapi",
+]
+
 [[package]]
 name = "linux-raw-sys"
 version = "0.1.4"
@@ -377,6 +447,28 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "magnus"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc87660cd7daa49fddbfd524c836de54d5c927d520cd163f43700c5087c57d6c"
+dependencies = [
+ "magnus-macros",
+ "rb-sys",
+ "rb-sys-env",
+]
+
+[[package]]
+name = "magnus-macros"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "206cb23bfeea05180c97522ef6a3e52a4eb17b0ed2f30ee3ca9c4f994d2378ae"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "memchr"
 version = "2.5.0"
@@ -392,6 +484,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "minimal-lexical"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
 [[package]]
 name = "miniz_oxide"
 version = "0.6.2"
@@ -418,6 +516,16 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "nom"
+version = "7.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d273983c5a657a70a3e8f2a01329822f3b8c8172b73826411a55751e404a0a4a"
+dependencies = [
+ "memchr",
+ "minimal-lexical",
+]
+
 [[package]]
 name = "num-format"
 version = "0.4.4"
@@ -481,6 +589,12 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "peeking_take_while"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "19b17cddbe7ec3f8bc800887bab5e717348c95ea2ca0b1bf0837fb964dc67099"
+
 [[package]]
 name = "petgraph"
 version = "0.6.3"
@@ -664,6 +778,35 @@ dependencies = [
  "getrandom",
 ]
 
+[[package]]
+name = "rb-sys"
+version = "0.9.65"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e8fe617bad8e88fd7e5d6f432e35f09e5f94144dfb8e8ee4adde82fb920dc59b"
+dependencies = [
+ "rb-sys-build",
+]
+
+[[package]]
+name = "rb-sys-build"
+version = "0.9.65"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "007e63597f91c711cbb299e60fecbdb6f5ad4a066d6a20c81943893f1584c895"
+dependencies = [
+ "bindgen",
+ "lazy_static",
+ "quote",
+ "regex",
+ "shell-words",
+ "syn",
+]
+
+[[package]]
+name = "rb-sys-env"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a35802679f07360454b418a5d1735c89716bde01d35b1560fc953c1415a0b3bb"
+
 [[package]]
 name = "redox_syscall"
 version = "0.2.16"
@@ -679,6 +822,8 @@ version = "1.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "48aaa5748ba571fb95cd2c85c09f629215d3a6ece942baa100950af03a34f733"
 dependencies = [
+ "aho-corasick",
+ "memchr",
  "regex-syntax",
 ]
 
@@ -712,6 +857,12 @@ version = "0.1.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7ef03e0a2b150c7a90d01faf6254c9c48a41e95fb2a8c2ac1c6f0d2b9aefc342"
 
+[[package]]
+name = "rustc-hash"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
+
 [[package]]
 name = "rustix"
 version = "0.36.8"
@@ -769,6 +920,18 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "shell-words"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24188a676b6ae68c3b2cb3a01be17fbf7240ce009799bb56d5b1409051e78fde"
+
+[[package]]
+name = "shlex"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43b2853a4d09f215c24cc5489c992ce46052d359b5109343cbafbf26bc62f8a3"
+
 [[package]]
 name = "smallvec"
 version = "1.10.0"
@@ -875,6 +1038,7 @@ name = "tzf"
 version = "0.1.0"
 dependencies = [
  "lazy_static",
+ "magnus",
  "tzf-rs",
 ]
 
diff --git a/Cargo.toml b/Cargo.toml
index 0b35d0a..a892e5f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,13 +1,7 @@
-[package]
-name = "tzf"
-version = "0.1.0"
-edition = "2021"
+# This Cargo.toml is here to let externals tools (IDEs, etc.) know that this is
+# a Rust project. Your extensions dependencies should be added to the Cargo.toml
+# in the ext/ directory.
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[lib]
-crate-type = ["cdylib"]
-
-[dependencies]
-lazy_static = "1.4.0"
-tzf-rs = "0.3.0"
+[workspace]
+members = ["./ext/tzf"]
+resolver = "2"
diff --git a/Gemfile b/Gemfile
index 04fa543..f962d9e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,6 +6,8 @@ source "https://rubygems.org"
 gemspec
 
 gem "rake", "~> 13.0"
+gem "rake-compiler"
+gem "rb_sys"
 
 gem "rspec", "~> 3.0"
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 895850d..63d6935 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,21 +1,22 @@
 PATH
   remote: .
   specs:
-    tzf (0.2.0.pre.pre)
-      ffi (~> 1.0)
+    tzf (0.2.0)
 
 GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.2)
     diff-lcs (1.5.0)
-    ffi (1.15.5)
     json (2.6.3)
     parallel (1.22.1)
     parser (3.2.0.0)
       ast (~> 2.4.1)
     rainbow (3.1.1)
     rake (13.0.6)
+    rake-compiler (1.2.1)
+      rake
+    rb_sys (0.9.65)
     regexp_parser (2.6.1)
     rexml (3.2.5)
     rspec (3.12.0)
@@ -58,6 +59,8 @@ PLATFORMS
 
 DEPENDENCIES
   rake (~> 13.0)
+  rake-compiler
+  rb_sys
   rspec (~> 3.0)
   rubocop (~> 1.21)
   rubocop-rake (~> 0.6)
diff --git a/Rakefile b/Rakefile
index 8ace323..e3f785e 100644
--- a/Rakefile
+++ b/Rakefile
@@ -9,16 +9,13 @@ require "rubocop/rake_task"
 
 RuboCop::RakeTask.new
 
-desc "Build rust dependencies"
-task :rust_build do
-  `cargo rustc --release`
-  `cp ./target/release/libtzf.so ./lib/tzf/`
-end
+require "rake/extensiontask"
+
+desc "Build extension"
+task build: :compile
 
-desc "Clean rust dependencies"
-task :rust_clean do
-  `cargo clean`
-  `rm -f ./lib/tzf/libtzf.so`
+Rake::ExtensionTask.new("tzf") do |ext|
+  ext.lib_dir = "lib/tzf"
 end
 
-task default: %i[rust_build spec rubocop]
+task default: %i[compile spec rubocop]
diff --git a/bin/release b/bin/release
index 9dd0962..a24ea2a 100755
--- a/bin/release
+++ b/bin/release
@@ -2,6 +2,8 @@
 
 set -e
 
+bundle exec rake
+
 version=$(ruby -e 'require_relative "lib/tzf/version"; puts TZF::VERSION')
 
 echo "Building gem version $version"
diff --git a/bin/setup b/bin/setup
index dea07af..cf4ad25 100755
--- a/bin/setup
+++ b/bin/setup
@@ -4,5 +4,3 @@ IFS=$'\n\t'
 set -vx
 
 bundle install
-
-bundle exec rake rust_build
diff --git a/ext/tzf/Cargo.lock b/ext/tzf/Cargo.lock
new file mode 100644
index 0000000..c166e09
--- /dev/null
+++ b/ext/tzf/Cargo.lock
@@ -0,0 +1,1207 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "addr2line"
+version = "0.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a76fd60b23679b7d19bd066031410fb7e458ccc5e958eb5c325888ce4baedc97"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
+name = "ahash"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c99f64d1e06488f620f932677e24bc6e2897582980441ae90a671415bd7ec2f"
+dependencies = [
+ "cfg-if",
+ "getrandom",
+ "once_cell",
+ "version_check",
+]
+
+[[package]]
+name = "aho-corasick"
+version = "0.7.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc936419f96fa211c1b9166887b38e5e40b19958e5b895be7c1f93adec7071ac"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "anyhow"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "224afbd727c3d6e4b90103ece64b8d1b67fbb1973b1046c2281eed3f3803f800"
+
+[[package]]
+name = "arrayvec"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8da52d66c7071e2e3fa2a1e5c6d088fec47b593032b254f5e980de8ea54454d6"
+
+[[package]]
+name = "autocfg"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+
+[[package]]
+name = "backtrace"
+version = "0.3.67"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "233d376d6d185f2a3093e58f283f60f880315b6c60075b01f36b3b85154564ca"
+dependencies = [
+ "addr2line",
+ "cc",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+]
+
+[[package]]
+name = "bindgen"
+version = "0.60.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "062dddbc1ba4aca46de6338e2bf87771414c335f7b2f2036e8f3e9befebf88e6"
+dependencies = [
+ "bitflags",
+ "cexpr",
+ "clang-sys",
+ "lazy_static",
+ "lazycell",
+ "peeking_take_while",
+ "proc-macro2",
+ "quote",
+ "regex",
+ "rustc-hash",
+ "shlex",
+]
+
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
+[[package]]
+name = "bytemuck"
+version = "1.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c041d3eab048880cb0b86b256447da3f18859a163c3b8d8893f4e6368abe6393"
+
+[[package]]
+name = "bytes"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89b2fd2a0dcf38d7971e2194b6b6eebab45ae01067456a7fd93d5547a61b70be"
+
+[[package]]
+name = "cc"
+version = "1.0.79"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
+
+[[package]]
+name = "cexpr"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6fac387a98bb7c37292057cffc56d62ecb629900026402633ae9160df93a8766"
+dependencies = [
+ "nom",
+]
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "cities-json"
+version = "0.3.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcdd53149b5ffe4097fd15acaf9c48e43940f186d420d8910bdc6e435529ce70"
+dependencies = [
+ "lazy_static",
+ "rand",
+ "serde",
+ "serde_json",
+]
+
+[[package]]
+name = "clang-sys"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77ed9a53e5d4d9c573ae844bfac6872b159cb1d1585a83b29e7a64b7eef7332a"
+dependencies = [
+ "glob",
+ "libc",
+ "libloading",
+]
+
+[[package]]
+name = "clap"
+version = "4.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0b0588d44d4d63a87dbd75c136c166bbfd9a86a31cb89e09906521c7d3f5e3"
+dependencies = [
+ "bitflags",
+ "clap_derive",
+ "clap_lex",
+ "is-terminal",
+ "once_cell",
+ "strsim",
+ "termcolor",
+]
+
+[[package]]
+name = "clap_derive"
+version = "4.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "684a277d672e91966334af371f1a7b5833f9aa00b07c84e92fbce95e00208ce8"
+dependencies = [
+ "heck",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "clap_lex"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "783fe232adfca04f90f56201b26d79682d4cd2625e0bc7290b95123afe558ade"
+dependencies = [
+ "os_str_bytes",
+]
+
+[[package]]
+name = "cpp_demangle"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b446fd40bcc17eddd6a4a78f24315eb90afdb3334999ddfd4909985c47722442"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "debugid"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef552e6f588e446098f6ba40d89ac146c8c7b64aade83c051ee00bb5d2bc18d"
+dependencies = [
+ "uuid",
+]
+
+[[package]]
+name = "either"
+version = "1.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fcaabb2fef8c910e7f4c7ce9f67a1283a1715879a7c230ca9d6d1ae31f16d91"
+
+[[package]]
+name = "errno"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f639046355ee4f37944e44f60642c6f3a7efa3cf6b78c78a0d989a8ce6c396a1"
+dependencies = [
+ "errno-dragonfly",
+ "libc",
+ "winapi",
+]
+
+[[package]]
+name = "errno-dragonfly"
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diff --git a/ext/tzf/Cargo.toml b/ext/tzf/Cargo.toml
new file mode 100644
index 0000000..e215dd6
--- /dev/null
+++ b/ext/tzf/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "tzf"
+version = "0.1.0"
+edition = "2021"
+authors = ["Kevin McCormack <kevin@mccormack.tech>"]
+license = "MIT"
+publish = false
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+lazy_static = "1.4.0"
+magnus = { version = "0.4" }
+tzf-rs = "0.3.0"
diff --git a/ext/tzf/extconf.rb b/ext/tzf/extconf.rb
new file mode 100644
index 0000000..ca59d57
--- /dev/null
+++ b/ext/tzf/extconf.rb
@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+require "mkmf"
+require "rb_sys/mkmf"
+
+create_rust_makefile("tzf/tzf")
diff --git a/ext/tzf/src/lib.rs b/ext/tzf/src/lib.rs
new file mode 100644
index 0000000..7fac89e
--- /dev/null
+++ b/ext/tzf/src/lib.rs
@@ -0,0 +1,25 @@
+use lazy_static::lazy_static;
+use magnus::{define_module, function, prelude::*, Error};
+use magnus::{RString};
+
+use tzf_rs::DefaultFinder;
+
+lazy_static! {
+  static ref FINDER: DefaultFinder = DefaultFinder::new();
+}
+
+#[no_mangle]
+fn get_tz_name(lat: f64, lng: f64) -> RString {
+  let tz_name = RString::new(FINDER.get_tz_name(lng, lat));
+
+  return tz_name;
+}
+
+#[magnus::init]
+fn init() -> Result<(), Error> {
+    let module = define_module("TZF")?;
+
+    module.define_singleton_method("tz_name", function!(get_tz_name, 2))?;
+
+    Ok(())
+}
diff --git a/lib/tzf.rb b/lib/tzf.rb
index 414593e..ebbfc16 100644
--- a/lib/tzf.rb
+++ b/lib/tzf.rb
@@ -1,15 +1,15 @@
 # frozen_string_literal: true
 
 require_relative "tzf/version"
-require_relative "tzf/ffi_ext"
+require_relative "tzf/tzf"
 
 ##
-# Top level.
+# Top level module.
+#
+# Methods defined in ext/tzf/src/lib.rs
+#
+# Ex TZF.tz_name(latitude, longitude) => String
 #
 module TZF
   class Error < StandardError; end
-
-  def self.tz_name(lat, lng)
-    FFIExt.get_tz_name(lat, lng)
-  end
 end
diff --git a/lib/tzf/ffi_ext.rb b/lib/tzf/ffi_ext.rb
deleted file mode 100644
index 8acb8ec..0000000
--- a/lib/tzf/ffi_ext.rb
+++ /dev/null
@@ -1,15 +0,0 @@
-# frozen_string_literal: true
-
-require "ffi"
-
-module TZF
-  ##
-  # Interface to tsf-rs Rust library.
-  #
-  module FFIExt
-    extend FFI::Library
-
-    ffi_lib File.expand_path("libtzf.so", __dir__)
-    attach_function :get_tz_name, %i[double double], :string
-  end
-end
diff --git a/lib/tzf/libtzf.so b/lib/tzf/libtzf.so
deleted file mode 100755
index d9a8bf5..0000000
Binary files a/lib/tzf/libtzf.so and /dev/null differ
diff --git a/lib/tzf/version.rb b/lib/tzf/version.rb
index 50e7ce3..f008929 100644
--- a/lib/tzf/version.rb
+++ b/lib/tzf/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module TZF
-  VERSION = "0.2.0-pre"
+  VERSION = "0.2.0"
 end
diff --git a/sig/tzf_rs_rb.rbs b/sig/tzf.rbs
similarity index 61%
rename from sig/tzf_rs_rb.rbs
rename to sig/tzf.rbs
index 965f7ca..1cb410c 100644
--- a/sig/tzf_rs_rb.rbs
+++ b/sig/tzf.rbs
@@ -1,4 +1,6 @@
-module tzf
+module TZF
   VERSION: String
   # See the writing guide of rbs: https://github.com/ruby/rbs#guides
+
+  def self.tz_name: (Float, Float) -> String
 end
diff --git a/tzf.gemspec b/tzf.gemspec
index 3ee977b..d2802ff 100644
--- a/tzf.gemspec
+++ b/tzf.gemspec
@@ -13,6 +13,7 @@ Gem::Specification.new do |spec|
   spec.homepage = "https://github.com/HarlemSquirrel/tzf-rb"
   spec.license = "MIT"
   spec.required_ruby_version = ">= 3.0.0"
+  spec.required_rubygems_version = ">= 3.3.11"
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = "https://github.com/HarlemSquirrel/tzf-rb"
@@ -28,11 +29,7 @@ Gem::Specification.new do |spec|
   spec.bindir = "exe"
   spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
+  spec.extensions = ["ext/tzf/extconf.rb"]
 
-  # Uncomment to register a new dependency of your gem
-  spec.add_dependency "ffi", "~> 1.0"
-
-  # For more information and examples about making a new gem, check out our
-  # guide at: https://bundler.io/guides/creating_gem.html
   spec.metadata["rubygems_mfa_required"] = "true"
 end