diff --git a/Cargo.lock b/Cargo.lock
index 8da89728..9891137f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -39,7 +39,7 @@ name = "async-trait"
 version = "0.1.38"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "syn 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -79,7 +79,7 @@ dependencies = [
  "lazycell 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "peeking_take_while 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.3.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-hash 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -525,7 +525,7 @@ version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro-hack 0.5.18 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro2 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "syn 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1077,7 +1077,7 @@ name = "pg-extern-attr"
 version = "0.2.2"
 dependencies = [
  "pg-extend 0.2.1",
- "proc-macro2 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "syn 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1111,7 +1111,7 @@ name = "pin-project-internal"
 version = "0.4.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "syn 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1188,7 +1188,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.19"
+version = "1.0.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "unicode-xid 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1204,7 +1204,7 @@ name = "quote"
 version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1356,7 +1356,7 @@ name = "serde_derive"
 version = "1.0.115"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "syn 1.0.39 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1476,7 +1476,7 @@ name = "syn"
 version = "1.0.39"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1860,7 +1860,7 @@ dependencies = [
 "checksum ppv-lite86 0.2.9 (registry+https://github.com/rust-lang/crates.io-index)" = "c36fa947111f5c62a733b652544dd0016a43ce89619538a8ef92724a6f501a20"
 "checksum proc-macro-hack 0.5.18 (registry+https://github.com/rust-lang/crates.io-index)" = "99c605b9a0adc77b7211c6b1f722dcb613d68d66859a44f3d485a6da332b0598"
 "checksum proc-macro-nested 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "eba180dafb9038b050a4c280019bbedf9f2467b61e5d892dcad585bb57aadc5a"
-"checksum proc-macro2 1.0.19 (registry+https://github.com/rust-lang/crates.io-index)" = "04f5f085b5d71e2188cb8271e5da0161ad52c3f227a661a3c135fdf28e258b12"
+"checksum proc-macro2 1.0.20 (registry+https://github.com/rust-lang/crates.io-index)" = "175c513d55719db99da20232b06cda8bab6b83ec2d04e3283edf0213c37c1a29"
 "checksum quick-error 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"
 "checksum quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)" = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37"
 "checksum rand 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6a6b1679d49b24bbfe0c803429aa1874472f50d9b363131f0e89fc356b544d03"
diff --git a/pg-extern-attr/Cargo.toml b/pg-extern-attr/Cargo.toml
index 7af571bd..9ccd7577 100644
--- a/pg-extern-attr/Cargo.toml
+++ b/pg-extern-attr/Cargo.toml
@@ -20,7 +20,7 @@ proc-macro = true
 [dependencies]
 syn = { version = "1.0.33", features = ["extra-traits", "full", "fold", "parsing"] }
 quote = "1.0.7"
-proc-macro2 = "1.0.17"
+proc-macro2 = "1.0.20"
 
 [dev-dependencies]
 pg-extend = { path = "../pg-extend" }
\ No newline at end of file