diff --git a/Cargo.lock b/Cargo.lock
index 80364515a7cca..542f5b3dfaf38 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -993,7 +993,7 @@ dependencies = [
  "proc-macro2 0.4.30",
  "quote 0.6.12",
  "syn 0.15.35",
- "synstructure",
+ "synstructure 0.10.2",
 ]
 
 [[package]]
@@ -3165,7 +3165,7 @@ dependencies = [
  "proc-macro2 0.4.30",
  "quote 0.6.12",
  "syn 0.15.35",
- "synstructure",
+ "synstructure 0.10.2",
 ]
 
 [[package]]
@@ -3546,10 +3546,10 @@ name = "rustc_macros"
 version = "0.1.0"
 dependencies = [
  "itertools 0.8.0",
- "proc-macro2 0.4.30",
- "quote 0.6.12",
- "syn 0.15.35",
- "synstructure",
+ "proc-macro2 1.0.3",
+ "quote 1.0.2",
+ "syn 1.0.5",
+ "synstructure 0.12.1",
 ]
 
 [[package]]
@@ -4242,6 +4242,18 @@ dependencies = [
  "unicode-xid 0.1.0",
 ]
 
+[[package]]
+name = "synstructure"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f085a5855930c0441ca1288cf044ea4aecf4f43a91668abdb870b4ba546a203"
+dependencies = [
+ "proc-macro2 1.0.3",
+ "quote 1.0.2",
+ "syn 1.0.5",
+ "unicode-xid 0.2.0",
+]
+
 [[package]]
 name = "syntax"
 version = "0.0.0"
diff --git a/src/librustc_macros/Cargo.toml b/src/librustc_macros/Cargo.toml
index f989ebc6dfd8e..c28fcb1a395ff 100644
--- a/src/librustc_macros/Cargo.toml
+++ b/src/librustc_macros/Cargo.toml
@@ -8,8 +8,8 @@ edition = "2018"
 proc-macro = true
 
 [dependencies]
-synstructure = "0.10.2"
-syn = { version = "0.15.22", features = ["full"] }
-proc-macro2 = "0.4.24"
-quote = "0.6.10"
+synstructure = "0.12.1"
+syn = { version = "1", features = ["full"] }
+proc-macro2 = "1"
+quote = "1"
 itertools = "0.8"
diff --git a/src/librustc_macros/src/hash_stable.rs b/src/librustc_macros/src/hash_stable.rs
index a708f3191dcf8..735cfb11b365c 100644
--- a/src/librustc_macros/src/hash_stable.rs
+++ b/src/librustc_macros/src/hash_stable.rs
@@ -15,22 +15,22 @@ fn parse_attributes(field: &syn::Field) -> Attributes {
     };
     for attr in &field.attrs {
         if let Ok(meta) = attr.parse_meta() {
-            if &meta.name().to_string() != "stable_hasher" {
+            if !meta.path().is_ident("stable_hasher") {
                 continue;
             }
             let mut any_attr = false;
             if let Meta::List(list) = meta {
                 for nested in list.nested.iter() {
                     if let NestedMeta::Meta(meta) = nested {
-                        if &meta.name().to_string() == "ignore" {
+                        if meta.path().is_ident("ignore") {
                             attrs.ignore = true;
                             any_attr = true;
                         }
-                        if &meta.name().to_string() == "project" {
+                        if meta.path().is_ident("project") {
                             if let Meta::List(list) = meta {
                                 if let Some(nested) = list.nested.iter().next() {
                                     if let NestedMeta::Meta(meta) = nested {
-                                        attrs.project = Some(meta.name());
+                                        attrs.project = meta.path().get_ident().cloned();
                                         any_attr = true;
                                     }
                                 }