diff --git a/Cargo.toml b/Cargo.toml
index 2a84943..b05d4de 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -56,7 +56,7 @@ rand_distr = "0.4"
 serde_json = "1"
 streaming-stats = "0.2"
 quantiles = "0.7"
-proptest = "=1.4"
+proptest = "=1.2"
 
 [package.metadata.docs.rs]
 # Enable certain features when building docs for docs.rs