diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 69db6af..cf2b29b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rust: [stable, 1.31.0]
+        rust: [stable, 1.56.1]
         include:
           - rust: nightly
             name: WebAssembly
diff --git a/Cargo.toml b/Cargo.toml
index c91a770..2b473a5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,7 +23,7 @@ quote = { version = "1", default-features = false }
 unicode-xid = "0.2"
 
 [dependencies.syn]
-version = "1"
+version = "2"
 default-features = false
 features = ["derive", "parsing", "printing", "clone-impls", "visit", "extra-traits"]