diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 63623740..4450c65b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -44,7 +44,7 @@ jobs:
             toolchain: stable
             transpile_target: null
           - os: ubuntu-18.04
-            toolchain: 1.53
+            toolchain: 1.56
             transpile_target: null
           - os: windows-latest
             toolchain: stable
diff --git a/Cargo.toml b/Cargo.toml
index 927e291e..cfec3ce8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,6 +11,7 @@ authors = [
 edition = "2018"
 homepage = "https://github.com/latex-lsp/texlab"
 resolver = "2"
+rust-version = "1.56.0"
 
 [lib]
 doctest = false
diff --git a/README.md b/README.md
index dc637ae4..93c50d9b 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 [![CI](https://github.com/latex-lsp/texlab/workflows/CI/badge.svg)](https://github.com/latex-lsp/texlab/actions)
 [![Coverage](https://codecov.io/gh/latex-lsp/texlab/branch/master/graph/badge.svg)](https://codecov.io/gh/latex-lsp/texlab)
-[![Rust](https://img.shields.io/badge/rustc-1.53%2B-blue)](https://blog.rust-lang.org/2021/06/17/Rust-1.53.0.html)
+[![Rust](https://img.shields.io/badge/rustc-1.56%2B-blue)](https://blog.rust-lang.org/2021/10/21/Rust-1.56.0.html)
 
 [![GitHub release](https://img.shields.io/github/release/latex-lsp/texlab?label=github)](https://github.com/latex-lsp/texlab/releases)
 [![CTAN](https://img.shields.io/ctan/v/texlab)](https://ctan.org/pkg/texlab)