diff --git a/Cargo.lock b/Cargo.lock
index d70ff0d0..2ee03365 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -63,7 +63,7 @@ version = "0.0.0"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.7",
 ]
 
 [[package]]
@@ -134,9 +134,9 @@ dependencies = [
 
 [[package]]
 name = "quote"
-version = "1.0.23"
+version = "1.0.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8856d8364d252a14d474036ea1358d63c9e6965c8e5c1885c18f73d70bff9c7b"
+checksum = "4424af4bf778aae2051a77b60283332f386554255d722233d09fbfc7e30da2fc"
 dependencies = [
  "proc-macro2",
 ]
@@ -164,7 +164,7 @@ checksum = "255abe9a125a985c05190d687b320c12f9b1f0b99445e608c21ba0782c719ad8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.109",
 ]
 
 [[package]]
@@ -180,9 +180,20 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.107"
+version = "1.0.109"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f4064b5b16e03ae50984a5a8ed5d4f8803e6bc1fd170a3cda91a1be4b18e3f5"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a9a90d19f27bb60792270bb90225f96d97fc5705395134b2ca1dcbb3acc27f4"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -197,7 +208,7 @@ checksum = "f36bdaa60a83aca3921b5259d5400cbf5e90fc51931376a9bd4a0eb79aa7210f"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.109",
  "unicode-xid",
 ]
 
@@ -249,6 +260,6 @@ version = "1.3.3"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.7",
  "synstructure",
 ]
diff --git a/fiat-constify/Cargo.toml b/fiat-constify/Cargo.toml
index 2c2b46a3..c3af946d 100644
--- a/fiat-constify/Cargo.toml
+++ b/fiat-constify/Cargo.toml
@@ -18,4 +18,4 @@ rust-version = "1.56"
 [dependencies]
 proc-macro2 = "1"
 quote = "1"
-syn = { version = "1", features = ["extra-traits", "full"] }
+syn = { version = "2", features = ["extra-traits", "full"] }
diff --git a/zeroize/derive/Cargo.toml b/zeroize/derive/Cargo.toml
index c33fbcf3..487eaa17 100644
--- a/zeroize/derive/Cargo.toml
+++ b/zeroize/derive/Cargo.toml
@@ -16,7 +16,7 @@ proc-macro = true
 [dependencies]
 proc-macro2 = "1"
 quote = "1"
-syn = "1"
+syn = "2"
 synstructure = "0.12.2"
 
 [package.metadata.docs.rs]