diff --git a/Cargo.toml b/Cargo.toml
index 7f12e00..dbab99b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ required-features = ["build-binary"]
 [dependencies]
 base64 = "0.13.0"
 peg = "0.6.3"
-proptest = "0.10.1"
+proptest = "1.0.0"
 rand = "0.7.3"  # intentionally not upgrading to avoid ./target/... path collision warning
 serde = { version = "1.0.118", features = ["derive"] }
 structopt = { version = "0.3.21", optional = true }