diff --git a/Cargo.lock b/Cargo.lock
index 9a09a9d54..223244707 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -60,13 +60,13 @@ dependencies = [
  "blake2s_simd 0.5.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "ff 0.5.0",
+ "ff 0.5.2",
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "group 0.2.0",
  "hex-literal 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "pairing 0.15.0",
+ "pairing 0.15.1",
  "rand 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_xorshift 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -270,16 +270,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "ff"
-version = "0.5.0"
+version = "0.5.2"
 dependencies = [
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "ff_derive 0.4.0",
+ "ff_derive 0.4.1",
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "ff_derive"
-version = "0.4.0"
+version = "0.4.1"
 dependencies = [
  "num-bigint 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "num-integer 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -337,7 +337,7 @@ dependencies = [
 name = "group"
 version = "0.2.0"
 dependencies = [
- "ff 0.5.0",
+ "ff 0.5.2",
  "rand 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_xorshift 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -381,10 +381,10 @@ dependencies = [
  "bellman 0.2.0",
  "blake2b_simd 0.5.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "blake2s_simd 0.5.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "ff 0.5.0",
+ "ff 0.5.2",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.62 (registry+https://github.com/rust-lang/crates.io-index)",
- "pairing 0.15.0",
+ "pairing 0.15.1",
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "zcash_mmr 0.1.0 (git+https://github.com/nikvolf/zcash-mmr)",
  "zcash_primitives 0.1.0",
@@ -454,10 +454,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "pairing"
-version = "0.15.0"
+version = "0.15.1"
 dependencies = [
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "ff 0.5.0",
+ "ff 0.5.2",
  "group 0.2.0",
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_xorshift 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -670,9 +670,9 @@ name = "zcash_client_backend"
 version = "0.1.0"
 dependencies = [
  "bech32 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "ff 0.5.0",
+ "ff 0.5.2",
  "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "pairing 0.15.0",
+ "pairing 0.15.1",
  "protobuf 2.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "protobuf-codegen-pure 2.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -700,13 +700,13 @@ dependencies = [
  "blake2s_simd 0.5.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "crypto_api_chachapoly 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "ff 0.5.0",
+ "ff 0.5.2",
  "fpe 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex-literal 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "pairing 0.15.0",
+ "pairing 0.15.1",
  "rand 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_xorshift 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -723,8 +723,8 @@ dependencies = [
  "blake2b_simd 0.5.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "directories 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "ff 0.5.0",
- "pairing 0.15.0",
+ "ff 0.5.2",
+ "pairing 0.15.1",
  "rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_xorshift 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "zcash_primitives 0.1.0",