diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index bc15f84..c2608ee 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -10,7 +10,7 @@ jobs:
       matrix:
         rust:
           - stable
-          - 1.46.0
+          - 1.63.0
           - nightly
     steps:
       - uses: actions/checkout@v2
diff --git a/Cargo.toml b/Cargo.toml
index 2a9c8c8..0e6ea9b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,6 +8,7 @@ homepage = "https://github.com/rusticata/ssh-parser"
 repository = "https://github.com/rusticata/ssh-parser"
 documentation = "https://docs.rs/ssh-parser"
 edition = "2018"
+rust-version = "1.63"
 
 [features]
 integers = ["num-bigint", "num-traits"]