diff --git a/Cargo.lock b/Cargo.lock
index 9d2e7a0f59c..b1abd3e3ee0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -472,7 +472,7 @@ dependencies = [
  "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_derive 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempfile 3.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -840,7 +840,7 @@ dependencies = [
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.80 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -852,7 +852,7 @@ dependencies = [
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "procedural-masquerade 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -870,38 +870,39 @@ version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "procedural-masquerade 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "darling"
-version = "0.8.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "darling_core 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "darling_macro 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "darling_core 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "darling_macro 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "darling_core"
-version = "0.8.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "ident_case 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "darling_macro"
-version = "0.8.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "darling_core 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "darling_core 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -935,7 +936,7 @@ dependencies = [
 name = "deny_public_fields"
 version = "0.0.1"
 dependencies = [
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -950,10 +951,10 @@ dependencies = [
 name = "derive_common"
 version = "0.0.1"
 dependencies = [
- "darling 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "darling 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -965,7 +966,7 @@ dependencies = [
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1052,7 +1053,7 @@ name = "dom_struct"
 version = "0.0.1"
 dependencies = [
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1061,7 +1062,7 @@ version = "0.0.1"
 dependencies = [
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1182,7 +1183,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1222,7 +1223,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1865,7 +1866,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1923,7 +1924,7 @@ dependencies = [
  "markup5ever 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -2169,7 +2170,7 @@ name = "jstraceable_derive"
 version = "0.0.1"
 dependencies = [
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2530,7 +2531,7 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2912,7 +2913,7 @@ dependencies = [
  "num-traits 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3708,7 +3709,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -3988,7 +3989,7 @@ dependencies = [
  "itertools 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -4010,7 +4011,7 @@ source = "git+https://github.com/servo/media#ecd5a7c6e4f51c5409321649dfb4a387bbd
 dependencies = [
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -4308,11 +4309,11 @@ dependencies = [
 name = "style_derive"
 version = "0.0.1"
 dependencies = [
- "darling 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "darling 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "derive_common 0.0.1",
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -4366,7 +4367,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "syn"
-version = "0.15.22"
+version = "0.15.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -4381,7 +4382,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -4511,11 +4512,11 @@ dependencies = [
 name = "to_shmem_derive"
 version = "0.0.1"
 dependencies = [
- "darling 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "darling 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "derive_common 0.0.1",
  "proc-macro2 0.4.26 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -5353,9 +5354,9 @@ dependencies = [
 "checksum cssparser-macros 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "b16e382d9b983fdb9ac6a36b37fdeb84ce3ea81f749febfee3463cfa7f24275e"
 "checksum cstr 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "19f7a08ed4ecd7e077d4cee63937473e6f7cf57b702a9114ef41751b2cbc0f60"
 "checksum cstr-macros 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "0f12dd847ec773fc98d75edba5394cb87d0f35e7ee548a4c81849ca6374b3d48"
-"checksum darling 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7f000e7b03a0083a30e1f10b1428a530849c21e72b338fa76869b5dbc4b045bf"
-"checksum darling_core 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "86bc5ce438f4b703755d12f59bbf0a16c642766d4534e922db47569dbdd0b998"
-"checksum darling_macro 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9973050ba46be2a2935a7b316147f41a808ac604b8f0fef6eba77fd47a89daeb"
+"checksum darling 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fcfbcb0c5961907597a7d1148e3af036268f2b773886b8bb3eeb1e1281d3d3d6"
+"checksum darling_core 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "6afc018370c3bff3eb51f89256a6bdb18b4fdcda72d577982a14954a7a0b402c"
+"checksum darling_macro 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "c6d8dac1c6f1d29a41c4712b4400f878cb4fcc4c7628f298dd75038e024998d1"
 "checksum dbus 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3d975a175aa2dced1a6cd410b89a1bf23918f301eab2b6f7c5e608291b757639"
 "checksum deflate 0.7.19 (registry+https://github.com/rust-lang/crates.io-index)" = "8a6abb26e16e8d419b5c78662aa9f82857c2386a073da266840e474d5055ec86"
 "checksum derive_more 0.13.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3f57d78cf3bd45270dad4e70c21ec77a960b36c7a841ff9db76aaa775a8fb871"
@@ -5612,7 +5613,7 @@ dependencies = [
 "checksum string_cache_shared 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b1884d1bc09741d466d9b14e6d37ac89d6909cbcac41dd9ae982d4d063bbedfc"
 "checksum strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb4f380125926a99e52bc279241539c018323fab05ad6368b56f93d9369ff550"
 "checksum swapper 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e454d048db5527d000bfddb77bd072bbf3a1e2ae785f16d9bd116e07c2ab45eb"
-"checksum syn 0.15.22 (registry+https://github.com/rust-lang/crates.io-index)" = "ae8b29eb5210bc5cf63ed6149cbf9adfc82ac0be023d8735c176ee74a2db4da7"
+"checksum syn 0.15.34 (registry+https://github.com/rust-lang/crates.io-index)" = "a1393e4a97a19c01e900df2aec855a29f71cf02c402e2f443b8d2747c25c5dbe"
 "checksum synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "73687139bf99285483c96ac0add482c3776528beac1d97d444f6e91f203a2015"
 "checksum tempfile 3.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "47776f63b85777d984a50ce49d6b9e58826b6a3766a449fc95bc66cd5663c15b"
 "checksum tendril 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "707feda9f2582d5d680d733e38755547a3e8fb471e7ba11452ecfd9ce93a5d3b"
diff --git a/components/derive_common/Cargo.toml b/components/derive_common/Cargo.toml
index 2a4fac64405..a9b478ecd5b 100644
--- a/components/derive_common/Cargo.toml
+++ b/components/derive_common/Cargo.toml
@@ -9,7 +9,7 @@ publish = false
 path = "lib.rs"
 
 [dependencies]
-darling = "0.8"
+darling = "0.9"
 proc-macro2 = "0.4"
 quote = "0.6"
 syn = { version = "0.15", features = ["visit"] }
diff --git a/components/style_derive/Cargo.toml b/components/style_derive/Cargo.toml
index 38c68ac0e36..fcc17f34ce5 100644
--- a/components/style_derive/Cargo.toml
+++ b/components/style_derive/Cargo.toml
@@ -10,7 +10,7 @@ path = "lib.rs"
 proc-macro = true
 
 [dependencies]
-darling = "0.8"
+darling = "0.9"
 derive_common = { path = "../derive_common" }
 proc-macro2 = "0.4"
 quote = "0.6"
diff --git a/components/to_shmem_derive/Cargo.toml b/components/to_shmem_derive/Cargo.toml
index e5aac7e0aaf..21e77c90f37 100644
--- a/components/to_shmem_derive/Cargo.toml
+++ b/components/to_shmem_derive/Cargo.toml
@@ -10,7 +10,7 @@ path = "lib.rs"
 proc-macro = true
 
 [dependencies]
-darling = "0.8"
+darling = "0.9"
 derive_common = { path = "../derive_common" }
 proc-macro2 = "0.4"
 quote = "0.6"