diff --git a/Cargo.toml b/Cargo.toml
index 204b19e1..491e3ab7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,19 +21,19 @@ bytes = "0.4.12"
 crossbeam-queue = "0.1.2"
 crossbeam-utils = { version = "0.6.6", default-features = false }
 failure = "0.1.5"
-futures-channel-preview = "=0.3.0-alpha.18"
-futures-core-preview = "=0.3.0-alpha.18"
-futures-util-preview = "=0.3.0-alpha.18"
+futures-channel-preview = "0.3.0-alpha.18"
+futures-core-preview = "0.3.0-alpha.18"
+futures-util-preview = "0.3.0-alpha.18"
 hex = { version = "0.3.2", default-features = false }
 log = "0.4.8"
 md-5 = "0.8.0"
 memchr = "2.2.1"
-tokio = { version = "=0.2.0-alpha.4", default-features = false, features = [ "tcp" ] }
+tokio = { version = "0.2.0-alpha.4", default-features = false, features = [ "tcp" ] }
 url = "2.1.0"
 
 [dev-dependencies]
 matches = "0.1.8"
-tokio = { version = "=0.2.0-alpha.4", default-features = false, features = [ "rt-full" ] }
+tokio = { version = "0.2.0-alpha.4", default-features = false, features = [ "rt-full" ] }
 
 [profile.release]
 lto = true