diff --git a/.clippy.toml b/.clippy.toml
index 5d37e5d8..df8fb6c6 100644
--- a/.clippy.toml
+++ b/.clippy.toml
@@ -1 +1 @@
-msrv = "1.70"
+msrv = "1.91"
diff --git a/README.md b/README.md
index 06be049a..7157050d 100644
--- a/README.md
+++ b/README.md
@@ -57,7 +57,7 @@ rustler::init!("Elixir.Math");
 
 #### Minimal Supported Rust Version (MSRV)
 
-Rustler currently has a minimal supported Rust version (MSRV) of 1.70. This
+Rustler currently has a minimal supported Rust version (MSRV) of 1.91. This
 is the configured version in `.clippy.toml`.
 
 #### Supported OTP and Elixir Versions
diff --git a/rustler/Cargo.toml b/rustler/Cargo.toml
index 6b0a548e..5ec408db 100644
--- a/rustler/Cargo.toml
+++ b/rustler/Cargo.toml
@@ -7,7 +7,7 @@ authors = ["Hansihe <me@hansihe.com>"]
 license = "MIT/Apache-2.0"
 readme = "../README.md"
 edition = "2021"
-rust-version = "1.70"
+rust-version = "1.91"
 
 [features]
 big_integer = ["dep:num-bigint"]