diff --git a/serde_derive/Cargo.toml b/serde_derive/Cargo.toml
index 1897cb1a..46246bb6 100644
--- a/serde_derive/Cargo.toml
+++ b/serde_derive/Cargo.toml
@@ -24,7 +24,7 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1.0"
 quote = "1.0"
-syn = "2.0.24"
+syn = "2.0.25"
 
 [dev-dependencies]
 serde = { version = "1.0", path = "../serde" }
diff --git a/serde_derive/src/internals/attr.rs b/serde_derive/src/internals/attr.rs
index bff82191..42212a64 100644
--- a/serde_derive/src/internals/attr.rs
+++ b/serde_derive/src/internals/attr.rs
@@ -1418,6 +1418,13 @@ fn get_lit_str2(
         ..
     }) = value
     {
+        let suffix = lit.suffix();
+        if !suffix.is_empty() {
+            cx.error_spanned_by(
+                lit,
+                format!("unexpected suffix `{}` on string literal", suffix),
+            );
+        }
         Ok(Some(lit.clone()))
     } else {
         cx.error_spanned_by(
diff --git a/serde_derive_internals/Cargo.toml b/serde_derive_internals/Cargo.toml
index 703a43cb..eb084af6 100644
--- a/serde_derive_internals/Cargo.toml
+++ b/serde_derive_internals/Cargo.toml
@@ -17,7 +17,7 @@ path = "lib.rs"
 [dependencies]
 proc-macro2 = "1.0"
 quote = "1.0"
-syn = { version = "2.0.24", default-features = false, features = ["clone-impls", "derive", "parsing", "printing"] }
+syn = { version = "2.0.25", default-features = false, features = ["clone-impls", "derive", "parsing", "printing"] }
 
 [package.metadata.docs.rs]
 targets = ["x86_64-unknown-linux-gnu"]