diff --git a/Cargo.toml b/Cargo.toml
index 53040ea..4782c02 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,7 +28,7 @@ optional = true
 version = "0.4"
 
 [dependencies.digest]
-version = "0.6"
+version = "^0.7"
 
 [dependencies.generic-array]
 # same version that digest depends on
@@ -39,7 +39,7 @@ version = "^1.0"
 optional = true
 
 [dependencies.sha2]
-version = "0.6"
+version = "^0.7"
 optional = true
 
 [dependencies.failure]
@@ -47,8 +47,8 @@ version = "^0.1.1"
 default-features = false
 
 [dev-dependencies]
-hex = "0.3"
-sha2 = "0.6"
+hex = "^0.3"
+sha2 = "^0.7"
 bincode = "^0.9"
 
 [features]