diff --git a/Cargo.toml b/Cargo.toml
index 13325428f..26499bd85 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,15 +12,15 @@ build = "src/build.rs"
 
 [dependencies]
 base64 = "0.2"
-chrono = ">= 0.2"
-hyper = "^ 0.9.0"
-itertools = ">= 0.4"
-log = ">= 0.3"
+chrono = "0.2"
+hyper = "0.9.0"
+itertools = "0.4"
+log = "0.3"
 openssl = "0.7"
 serde = "0.8"
 serde_json = "0.8"
 serde_macros = { version = "0.8", optional = true }
-url = "= 0.5"
+url = "0.5"
 
 [features]
 default = ["with-serde-codegen"]