diff --git a/Cargo.lock b/Cargo.lock
index 774b43b9..b57317d4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1213,6 +1213,15 @@ dependencies = [
  "ascii_utils",
 ]
 
+[[package]]
+name = "fastrand"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "779d043b6a0b90cc4c0ed7ee380a6504394cee7efd7db050e3774eee387324b2"
+dependencies = [
+ "instant",
+]
+
 [[package]]
 name = "filetime"
 version = "0.2.15"
@@ -2408,6 +2417,12 @@ dependencies = [
  "unicase 2.6.0",
 ]
 
+[[package]]
+name = "minimal-lexical"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "68354c5c6bd36d73ff3feceb05efa59b6acb7626617f4962be322a825e61f79a"
+
 [[package]]
 name = "miniz_oxide"
 version = "0.4.4"
@@ -2621,6 +2636,28 @@ dependencies = [
  "version_check 0.9.4",
 ]
 
+[[package]]
+name = "nom"
+version = "7.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b1d11e1ef389c76fe5b81bcaf2ea32cf88b62bc494e19f493d0b30e7a930109"
+dependencies = [
+ "memchr",
+ "minimal-lexical",
+ "version_check 0.9.4",
+]
+
+[[package]]
+name = "nom_locate"
+version = "4.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37794436ca3029a3089e0b95d42da1f0b565ad271e4d3bb4bad0c7bb70b10605"
+dependencies = [
+ "bytecount",
+ "memchr",
+ "nom 7.1.0",
+]
+
 [[package]]
 name = "notify"
 version = "4.0.17"
@@ -2639,6 +2676,17 @@ dependencies = [
  "winapi 0.3.9",
 ]
 
+[[package]]
+name = "num-bigint"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f93ab6289c7b344a8a9f60f88d80aa20032336fe78da341afc91c8a2341fc75f"
+dependencies = [
+ "autocfg 1.0.1",
+ "num-integer",
+ "num-traits 0.2.14",
+]
+
 [[package]]
 name = "num-integer"
 version = "0.1.44"
@@ -2651,9 +2699,9 @@ dependencies = [
 
 [[package]]
 name = "num-rational"
-version = "0.2.4"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5c000134b5dbf44adc5cb772486d335293351644b801551abe8f75c84cfa4aef"
+checksum = "d41702bd167c2df5520b384281bc111a4b5efcf7fbc4c9c222c815b07e0a6a6a"
 dependencies = [
  "autocfg 1.0.1",
  "num-integer",
@@ -3830,15 +3878,18 @@ dependencies = [
 
 [[package]]
 name = "rsass"
-version = "0.9.8"
+version = "0.23.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f4534cc03040beacd2668621815f26fe57e5b7cfe085790f98e5e87c1612316"
+checksum = "8da5895d80d89e1b59f12ac5433919a32a1495267d5e09189923420eec89b01c"
 dependencies = [
+ "fastrand",
  "lazy_static",
- "nom 4.2.3",
+ "nom 7.1.0",
+ "nom_locate",
+ "num-bigint",
+ "num-integer",
  "num-rational",
  "num-traits 0.2.14",
- "rand 0.6.5",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 36cb68e9..5eb651c4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -68,7 +68,7 @@ rev = "29910f2829e7e590a540da3804336577b48c7b31"
 
 [build-dependencies]
 ructe = "0.13.0"
-rsass = "0.9"
+rsass = "0.23"
 
 [features]
 default = ["postgres"]