diff --git a/Cargo.lock b/Cargo.lock
index d2ec03bc..2262c993 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -73,6 +73,12 @@ version = "1.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
+[[package]]
+name = "bitflags"
+version = "2.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4682ae6287fcf752ecaabbfcc7b6f9b72aa33933dc23a554d853aea8eea8635"
+
 [[package]]
 name = "bitvec"
 version = "1.0.1"
@@ -126,12 +132,6 @@ version = "3.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0d261e256854913907f67ed06efbc3338dfe6179796deefc1ff763fc1aee5535"
 
-[[package]]
-name = "byteorder"
-version = "1.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
-
 [[package]]
 name = "cast"
 version = "0.3.0"
@@ -193,7 +193,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4f423e341edefb78c9caba2d9c7f7687d0e72e89df3ce3394554754393ac3990"
 dependencies = [
  "anstyle",
- "bitflags",
+ "bitflags 1.3.2",
  "clap_lex",
 ]
 
@@ -865,19 +865,19 @@ dependencies = [
 
 [[package]]
 name = "proptest"
-version = "1.2.0"
+version = "1.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4e35c06b98bf36aba164cc17cb25f7e232f5c4aeea73baa14b8a9f0d92dbfa65"
+checksum = "7c003ac8c77cb07bb74f5f198bce836a689bcd5a42574612bf14d17bfd08c20e"
 dependencies = [
  "bit-set",
- "bitflags",
- "byteorder",
+ "bit-vec",
+ "bitflags 2.4.0",
  "lazy_static",
  "num-traits",
  "rand",
  "rand_chacha",
  "rand_xorshift",
- "regex-syntax",
+ "regex-syntax 0.7.5",
  "rusty-fork",
  "tempfile",
  "unarray",
@@ -971,7 +971,7 @@ version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fb5a58c1855b4b6819d59012155603f0b22ad30cad752600aadfcb695265519a"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
 ]
 
 [[package]]
@@ -980,7 +980,7 @@ version = "1.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "48aaa5748ba571fb95cd2c85c09f629215d3a6ece942baa100950af03a34f733"
 dependencies = [
- "regex-syntax",
+ "regex-syntax 0.6.28",
 ]
 
 [[package]]
@@ -989,6 +989,12 @@ version = "0.6.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "456c603be3e8d448b072f410900c09faf164fbce2d480456f50eea6e25f9c848"
 
+[[package]]
+name = "regex-syntax"
+version = "0.7.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dbb5fb1acd8a1a18b3dd5be62d25485eb770e05afb408a9627d14d451bae12da"
+
 [[package]]
 name = "rfc6979"
 version = "0.4.0"
@@ -1005,7 +1011,7 @@ version = "0.36.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f43abb88211988493c1abb44a70efa56ff0ce98f233b7b276146f1f3f7ba9644"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "errno 0.2.8",
  "io-lifetimes",
  "libc",
@@ -1019,7 +1025,7 @@ version = "0.37.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "62b24138615de35e32031d041a09032ef3487a616d901ca4db224e7d557efae2"
 dependencies = [
- "bitflags",
+ "bitflags 1.3.2",
  "errno 0.3.1",
  "io-lifetimes",
  "libc",
diff --git a/k256/Cargo.toml b/k256/Cargo.toml
index a6c5afe5..66591473 100644
--- a/k256/Cargo.toml
+++ b/k256/Cargo.toml
@@ -36,7 +36,7 @@ ecdsa-core = { version = "0.16", package = "ecdsa", default-features = false, fe
 hex-literal = "0.4"
 num-bigint = "0.4"
 num-traits = "0.2"
-proptest = "1.2"
+proptest = "1.3"
 rand_core = { version = "0.6", features = ["getrandom"] }
 sha3 = { version = "0.10", default-features = false }
 
diff --git a/p384/Cargo.toml b/p384/Cargo.toml
index 27865047..9f5f5418 100644
--- a/p384/Cargo.toml
+++ b/p384/Cargo.toml
@@ -32,7 +32,7 @@ criterion = "0.5"
 ecdsa-core = { version = "0.16", package = "ecdsa", default-features = false, features = ["dev"] }
 hex-literal = "0.4"
 primeorder = { version = "0.13", features = ["dev"], path = "../primeorder" }
-proptest = "1.2"
+proptest = "1.3"
 rand_core = { version = "0.6", features = ["getrandom"] }
 
 [features]