diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index ab339cc..7a78450 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -23,7 +23,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.67.0 # MSRV
+          - 1.70.0 # MSRV
           - stable
           - nightly
     steps:
diff --git a/README.md b/README.md
index 2ebb581..94156d6 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 [![Crates.io](https://img.shields.io/crates/v/vibrato)](https://crates.io/crates/vibrato)
 [![Documentation](https://docs.rs/vibrato/badge.svg)](https://docs.rs/vibrato)
-![Build Status](https://github.com/daac-tools/vibrato/actions/workflows/rust.yml/badge.svg)
+[![Build Status](https://github.com/daac-tools/vibrato/actions/workflows/rust.yml/badge.svg)](https://github.com/daac-tools/vibrato/actions)
 [![Slack](https://img.shields.io/badge/join-chat-brightgreen?logo=slack)](https://join.slack.com/t/daac-tools/shared_invite/zt-1pwwqbcz4-KxL95Nam9VinpPlzUpEGyA)
 
 Vibrato is a fast implementation of tokenization (or morphological analysis) based on the Viterbi algorithm.
diff --git a/benchmark/Cargo.toml b/benchmark/Cargo.toml
index d710bc2..6aaf8a4 100644
--- a/benchmark/Cargo.toml
+++ b/benchmark/Cargo.toml
@@ -2,13 +2,9 @@
 name = "benchmark"
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.67"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [features]
 default = []
-
 unchecked = []
 
 [dependencies]
diff --git a/compile/Cargo.toml b/compile/Cargo.toml
index b355280..6c91a75 100644
--- a/compile/Cargo.toml
+++ b/compile/Cargo.toml
@@ -2,12 +2,6 @@
 name = "compile"
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.67"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[features]
-default = []
 
 [dependencies]
 vibrato = { path = "../vibrato" }
diff --git a/dictgen/Cargo.toml b/dictgen/Cargo.toml
index 15eb326..31380d9 100644
--- a/dictgen/Cargo.toml
+++ b/dictgen/Cargo.toml
@@ -2,7 +2,6 @@
 name = "dictgen"
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.67"
 
 [dependencies]
 clap = { version = "4.0", features = ["derive"] }  # MIT or Apache-2.0
diff --git a/evaluate/Cargo.toml b/evaluate/Cargo.toml
index 18d824f..779f1bc 100644
--- a/evaluate/Cargo.toml
+++ b/evaluate/Cargo.toml
@@ -2,7 +2,6 @@
 name = "evaluate"
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.67"
 
 default-run = "evaluate"
 
diff --git a/map/Cargo.toml b/map/Cargo.toml
index 2c1b130..6aada10 100644
--- a/map/Cargo.toml
+++ b/map/Cargo.toml
@@ -2,15 +2,9 @@
 name = "map"
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.67"
 
 default-run = "map"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[features]
-default = []
-
 [dependencies]
 vibrato = { path = "../vibrato" }
 clap = { version = "4.0", features = ["derive"] }  # MIT or Apache-2.0
diff --git a/tokenize/Cargo.toml b/tokenize/Cargo.toml
index 4938213..aad3ecf 100644
--- a/tokenize/Cargo.toml
+++ b/tokenize/Cargo.toml
@@ -2,12 +2,6 @@
 name = "tokenize"
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.67"
-
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
-[features]
-default = []
 
 [dependencies]
 atty = "0.2"  # MIT
diff --git a/train/Cargo.toml b/train/Cargo.toml
index a2ee062..6bb62e8 100644
--- a/train/Cargo.toml
+++ b/train/Cargo.toml
@@ -2,7 +2,6 @@
 name = "train"
 version = "0.1.0"
 edition = "2021"
-rust-version = "1.67"
 
 [dependencies]
 clap = { version = "4.0", features = ["derive"] }  # MIT or Apache-2.0
diff --git a/vibrato/Cargo.toml b/vibrato/Cargo.toml
index 28125f9..3cfa0ac 100644
--- a/vibrato/Cargo.toml
+++ b/vibrato/Cargo.toml
@@ -3,7 +3,7 @@ name = "vibrato"
 # NOTE(kampersanda): Developers should check compatibility with MODEL_MAGIC in dictionary.rs.
 version = "0.5.1"
 edition = "2021"
-rust-version = "1.67"
+rust-version = "1.70"
 authors = [
     "Shunsuke Kanda <shnsk.knd@gmail.com>",
     "Koichi Akabe <vbkaisetsu@gmail.com>",