diff --git a/Cargo.toml b/Cargo.toml
index af69af47a5..e1f5edb2f9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,8 +25,8 @@ chrono-humanize = "0.0.11"
 byte-unit = "2.1.0"
 ordered-float = {version = "1.0.2", features = ["serde"]}
 prettyprint = "0.7.0"
-futures-preview = { version = "0.3.0-alpha.16", features = ["compat", "io-compat"] }
-futures-sink-preview = "0.3.0-alpha.16"
+futures-preview = { version = "=0.3.0-alpha.16", features = ["compat", "io-compat"] }
+futures-sink-preview = "=0.3.0-alpha.16"
 futures_codec = "0.2.2"
 term = "0.5.2"
 bytes = "0.4.12"