diff --git a/quasi/Cargo.toml b/quasi/Cargo.toml
index 931f399f..b71f7993 100644
--- a/quasi/Cargo.toml
+++ b/quasi/Cargo.toml
@@ -13,5 +13,5 @@ unstable-testing = ["clippy"]
 
 [dependencies]
 clippy = { version = "^0.*", optional = true }
-syntex_errors = { version = "^0.48.0", optional = true }
-syntex_syntax = { version = "^0.48.0", optional = true }
+syntex_errors = { version = "^0.50.0", optional = true }
+syntex_syntax = { version = "^0.50.0", optional = true }
diff --git a/quasi/src/lib.rs b/quasi/src/lib.rs
index ed6efd55..577b7304 100644
--- a/quasi/src/lib.rs
+++ b/quasi/src/lib.rs
@@ -93,43 +93,43 @@ impl ToTokens for ast::Ident {
 
 impl ToTokens for ast::Path {
     fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> {
-        vec![TokenTree::Token(DUMMY_SP, token::Interpolated(token::NtPath(Box::new(self.clone()))))]
+        vec![TokenTree::Token(DUMMY_SP, token::Interpolated(Rc::new(token::NtPath(self.clone()))))]
     }
 }
 
 impl ToTokens for ast::Ty {
     fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> {
-        vec![TokenTree::Token(self.span, token::Interpolated(token::NtTy(P(self.clone()))))]
+        vec![TokenTree::Token(self.span, token::Interpolated(Rc::new(token::NtTy(P(self.clone())))))]
     }
 }
 
 impl ToTokens for P<ast::Ty> {
     fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> {
-        vec![TokenTree::Token(self.span, token::Interpolated(token::NtTy(self.clone())))]
+        vec![TokenTree::Token(self.span, token::Interpolated(Rc::new(token::NtTy(self.clone()))))]
     }
 }
 
 impl ToTokens for P<ast::Block> {
     fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> {
-        vec![TokenTree::Token(self.span, token::Interpolated(token::NtBlock(self.clone())))]
+        vec![TokenTree::Token(self.span, token::Interpolated(Rc::new(token::NtBlock(self.clone()))))]
     }
 }
 
 impl ToTokens for P<ast::Item> {
     fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> {
-        vec![TokenTree::Token(self.span, token::Interpolated(token::NtItem(self.clone())))]
+        vec![TokenTree::Token(self.span, token::Interpolated(Rc::new(token::NtItem(self.clone()))))]
     }
 }
 
 impl ToTokens for P<ast::ImplItem> {
     fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> {
-        vec![TokenTree::Token(self.span, token::Interpolated(token::NtImplItem(self.clone())))]
+        vec![TokenTree::Token(self.span, token::Interpolated(Rc::new(token::NtImplItem((**self).clone()))))]
     }
 }
 
 impl ToTokens for P<ast::TraitItem> {
     fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> {
-        vec![TokenTree::Token(self.span, token::Interpolated(token::NtTraitItem(self.clone())))]
+        vec![TokenTree::Token(self.span, token::Interpolated(Rc::new(token::NtTraitItem((**self).clone()))))]
     }
 }
 
@@ -169,7 +169,7 @@ impl ToTokens for ast::WhereClause {
 impl ToTokens for ast::Stmt {
     fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> {
         let mut tts = vec![
-            TokenTree::Token(self.span, token::Interpolated(token::NtStmt(P(self.clone()))))
+            TokenTree::Token(self.span, token::Interpolated(Rc::new(token::NtStmt(self.clone()))))
         ];
 
         // Some statements require a trailing semicolon.
@@ -183,19 +183,19 @@ impl ToTokens for ast::Stmt {
 
 impl ToTokens for P<ast::Expr> {
     fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> {
-        vec![TokenTree::Token(self.span, token::Interpolated(token::NtExpr(self.clone())))]
+        vec![TokenTree::Token(self.span, token::Interpolated(Rc::new(token::NtExpr(self.clone()))))]
     }
 }
 
 impl ToTokens for P<ast::Pat> {
     fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> {
-        vec![TokenTree::Token(self.span, token::Interpolated(token::NtPat(self.clone())))]
+        vec![TokenTree::Token(self.span, token::Interpolated(Rc::new(token::NtPat(self.clone()))))]
     }
 }
 
 impl ToTokens for ast::Arm {
     fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> {
-        vec![TokenTree::Token(DUMMY_SP, token::Interpolated(token::NtArm(self.clone())))]
+        vec![TokenTree::Token(DUMMY_SP, token::Interpolated(Rc::new(token::NtArm(self.clone()))))]
     }
 }
 
@@ -221,7 +221,7 @@ impl_to_tokens_slice! { P<ast::Item>, [] }
 
 impl ToTokens for P<ast::MetaItem> {
     fn to_tokens(&self, _cx: &ExtCtxt) -> Vec<TokenTree> {
-        vec![TokenTree::Token(DUMMY_SP, token::Interpolated(token::NtMeta(self.clone())))]
+        vec![TokenTree::Token(DUMMY_SP, token::Interpolated(Rc::new(token::NtMeta(self.clone()))))]
     }
 }
 
diff --git a/quasi_codegen/Cargo.toml b/quasi_codegen/Cargo.toml
index 658172dc..715459f8 100644
--- a/quasi_codegen/Cargo.toml
+++ b/quasi_codegen/Cargo.toml
@@ -13,8 +13,8 @@ with-syntex = ["syntex", "syntex_errors", "syntex_syntax", "aster/with-syntex"]
 unstable-testing = ["clippy"]
 
 [dependencies]
-aster = { version = "^0.33.0", default-features = false }
+aster = { version = "^0.34.0", default-features = false }
 clippy = { version = "^0.*", optional = true }
-syntex = { version = "^0.48.0", optional = true }
-syntex_errors = { version = "^0.48.0", optional = true }
-syntex_syntax = { version = "^0.48.0", optional = true }
+syntex = { version = "^0.50.0", optional = true }
+syntex_errors = { version = "^0.50.0", optional = true }
+syntex_syntax = { version = "^0.50.0", optional = true }
diff --git a/quasi_macros/Cargo.toml b/quasi_macros/Cargo.toml
index 3f838493..37920bed 100644
--- a/quasi_macros/Cargo.toml
+++ b/quasi_macros/Cargo.toml
@@ -19,5 +19,5 @@ clippy = { version = "^0.*", optional = true }
 quasi_codegen = { version = "^0.25", path = "../quasi_codegen", default-features = false }
 
 [dev-dependencies]
-aster = "^0.33.0"
+aster = "^0.34.0"
 quasi = { version = "^0.25", path = "../quasi" }
diff --git a/quasi_tests/Cargo.toml b/quasi_tests/Cargo.toml
index 36635635..c0a25e10 100644
--- a/quasi_tests/Cargo.toml
+++ b/quasi_tests/Cargo.toml
@@ -12,13 +12,13 @@ unstable-testing = ["clippy", "quasi/unstable-testing", "quasi_codegen/unstable-
 
 [build-dependencies]
 quasi_codegen = { path = "../quasi_codegen" }
-syntex = { version = "^0.48.0" }
+syntex = { version = "^0.50.0" }
 
 [dependencies]
 clippy = { version = "^0.*", optional = true }
 
 [dev-dependencies]
-aster = { version = "^0.33.0", features = ["with-syntex"] }
+aster = { version = "^0.34.0", features = ["with-syntex"] }
 quasi = { path = "../quasi", features = ["with-syntex"] }
-syntex = { version = "^0.48.0" }
-syntex_syntax = { version = "^0.48.0" }
+syntex = { version = "^0.50.0" }
+syntex_syntax = { version = "^0.50.0" }