diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 76b3b45a..0d8bcaaf 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -57,7 +57,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        toolchain: [ nightly, beta, stable, 1.76.0 ]
+        toolchain: [ nightly, beta, stable, 1.77.0 ]
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@master
diff --git a/Cargo.toml b/Cargo.toml
index 69fca154..babd2e51 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -17,7 +17,7 @@ version = "0.11.0-beta.9"
 authors = ["Dr Maxim Orlovsky <orlovsky@lnp-bp.org>"]
 homepage = "https://github.com/LNP-BP"
 repository = "https://github.com/LNP-BP/client_side_validation"
-rust-version = "1.76.0" # Due to ascii-armor
+rust-version = "1.77.0" # Due to `rustfix`
 edition = "2021"
 license = "Apache-2.0"
 
diff --git a/MANIFEST.yml b/MANIFEST.yml
index 01614009..eb94ce12 100644
--- a/MANIFEST.yml
+++ b/MANIFEST.yml
@@ -3,7 +3,7 @@ Type: Library
 Kind: Free software
 License: Apache-2.0
 Language: Rust
-Compiler: 1.76
+Compiler: 1.77
 Author: Maxim Orlovsky
 Maintained: UBIDECO Institute, Switzerland
 Maintainers: