diff --git a/Cargo.lock b/Cargo.lock
index 791e0a0..a2b8298 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -64,7 +64,7 @@ dependencies = [
  "futures 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "group 0.1.0",
- "hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "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 0.14.2",
  "rand 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -329,19 +329,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "hex-literal"
-version = "0.1.4"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "hex-literal-impl 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "proc-macro-hack 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hex-literal-impl 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-hack 0.5.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "hex-literal-impl"
-version = "0.1.2"
+version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro-hack 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-hack 0.5.9 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -450,17 +450,14 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "proc-macro-hack"
-version = "0.4.2"
+version = "0.5.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro-hack-impl 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "proc-macro-hack-impl"
-version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "proc-macro2"
 version = "1.0.2"
@@ -630,7 +627,7 @@ dependencies = [
  "ff 0.4.0",
  "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 0.1.4 (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 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "pairing 0.14.2",
@@ -693,8 +690,8 @@ dependencies = [
 "checksum generic-array 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)" = "c68f0274ae0e023facc3c97b2e00f076be70e254bc851d972503b328db79b2ec"
 "checksum getrandom 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "34f33de6f0ae7c9cb5e574502a562e2b512799e32abb801cd1e79ad952b62b49"
 "checksum hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "805026a5d0141ffc30abb3be3173848ad46a1b1664fe632428479619a3644d77"
-"checksum hex-literal 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "ddc2928beef125e519d69ae1baa8c37ea2e0d3848545217f6db0179c5eb1d639"
-"checksum hex-literal-impl 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "520870c3213943eb8d7803e80180d12a6c7ceb4ae74602544529d1643dc4ddda"
+"checksum hex-literal 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "961de220ec9a91af2e1e5bd80d02109155695e516771762381ef8581317066e0"
+"checksum hex-literal-impl 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9d4c5c844e2fee0bf673d54c2c177f1713b3d2af2ff6e666b49cb7572e6cf42d"
 "checksum lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bc5729f27f159ddd61f4df6228e827e86643d4d3e7c32183cb30a1c08f604a14"
 "checksum libc 0.2.61 (registry+https://github.com/rust-lang/crates.io-index)" = "c665266eb592905e8503ba3403020f4b8794d26263f412ca33171600eca9a6fa"
 "checksum log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "14b6052be84e6b71ab17edffc2eeabf5c2c3ae1fdb464aae35ac50c67a44e1f7"
@@ -706,8 +703,7 @@ dependencies = [
 "checksum num_cpus 1.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "bcef43580c035376c0705c42792c294b66974abbfd2789b511784023f71f3273"
 "checksum opaque-debug 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2839e79665f131bdb5782e51f2c6c9599c133c6098982a54c794358bf432529c"
 "checksum ppv-lite86 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "e3cbf9f658cdb5000fcf6f362b8ea2ba154b9f146a61c7a20d647034c6b6561b"
-"checksum proc-macro-hack 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "463bf29e7f11344e58c9e01f171470ab15c925c6822ad75028cc1c0e1d1eb63b"
-"checksum proc-macro-hack-impl 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "38c47dcb1594802de8c02f3b899e2018c78291168a22c281be21ea0fb4796842"
+"checksum proc-macro-hack 0.5.9 (registry+https://github.com/rust-lang/crates.io-index)" = "e688f31d92ffd7c1ddc57a1b4e6d773c0f2a14ee437a4b0a4f5a69c80eb221c8"
 "checksum proc-macro2 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "175a40b9cf564ce9bf050654633dbf339978706b8ead1a907bb970b63185dd95"
 "checksum quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "053a8c8bcc71fcce321828dc897a98ab9760bef03a4fc36693c231e5b3216cfe"
 "checksum rand 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d47eab0e83d9693d40f825f86948aa16eff6750ead4bdffc4ab95b8b3a7f052c"
diff --git a/bellman/Cargo.toml b/bellman/Cargo.toml
index c27a1dc..fe2a55a 100644
--- a/bellman/Cargo.toml
+++ b/bellman/Cargo.toml
@@ -23,7 +23,7 @@ rand_core = "0.5"
 byteorder = "1"
 
 [dev-dependencies]
-hex-literal = "0.1"
+hex-literal = "0.2"
 rand = "0.7"
 rand_xorshift = "0.2"
 sha2 = "0.8"
diff --git a/zcash_primitives/Cargo.toml b/zcash_primitives/Cargo.toml
index 7019dec..22e4aca 100644
--- a/zcash_primitives/Cargo.toml
+++ b/zcash_primitives/Cargo.toml
@@ -24,5 +24,5 @@ rand_os = "0.2"
 sha2 = "0.8"
 
 [dev-dependencies]
-hex-literal = "0.1"
+hex-literal = "0.2"
 rand_xorshift = "0.2"