diff --git a/Cargo.lock b/Cargo.lock
index 6a52fc7..1893d91 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -446,7 +446,7 @@ version = "0.1.0"
 dependencies = [
  "failure 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "proptest 0.9.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proptest 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "ring 0.13.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1107,7 +1107,7 @@ dependencies = [
 
 [[package]]
 name = "proptest"
-version = "0.9.5"
+version = "0.9.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bit-set 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2266,7 +2266,7 @@ dependencies = [
 "checksum pretty_env_logger 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "926d36b9553851b8b0005f1275891b392ee4d2d833852c417ed025477350fb9d"
 "checksum proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)" = "cf3d2011ab5c909338f7887f4fc896d35932e29146c12c8d01da6b22a80ba759"
 "checksum proc-macro2 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4c5c2380ae88876faae57698be9e9775e3544decad214599c3a6266cca6ac802"
-"checksum proptest 0.9.5 (registry+https://github.com/rust-lang/crates.io-index)" = "bf6147d103a7c9d7598f4105cf049b15c99e2ecd93179bf024f0fd349be5ada4"
+"checksum proptest 0.9.6 (registry+https://github.com/rust-lang/crates.io-index)" = "01c477819b845fe023d33583ebf10c9f62518c8d79a0960ba5c36d6ac8a55a5b"
 "checksum publicsuffix 1.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "5afecba86dcf1e4fd610246f89899d1924fe12e1e89f555eb7c7f710f3c5ad1d"
 "checksum quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9274b940887ce9addde99c4eee6b5c44cc494b182b97e73dc8ffdcb3397fd3f0"
 "checksum quote 0.6.12 (registry+https://github.com/rust-lang/crates.io-index)" = "faf4799c5d274f3868a4aae320a0a182cbd2baee377b378f080e16a23e9d80db"
diff --git a/crypto/Cargo.toml b/crypto/Cargo.toml
index 543e8bb..0113a39 100644
--- a/crypto/Cargo.toml
+++ b/crypto/Cargo.toml
@@ -10,4 +10,4 @@ hex = "0.4.0"
 ring = "0.13.5"
 
 [dev-dependencies]
-proptest = "0.9.5"
+proptest = "0.9.6"