diff --git a/postgres-shared/Cargo.toml b/postgres-shared/Cargo.toml
index c6e7b183..0136a864 100644
--- a/postgres-shared/Cargo.toml
+++ b/postgres-shared/Cargo.toml
@@ -25,6 +25,6 @@ bit-vec = { version = "0.4", optional = true }
 chrono = { version = "0.3", optional = true }
 eui48 = { version = "0.1", optional = true }
 rustc-serialize = { version = "0.3", optional = true }
-serde_json = { version = ">= 0.6, < 0.10", optional = true }
+serde_json = { version = "0.9", optional = true }
 time = { version = "0.1.14", optional = true }
-uuid = { version = ">= 0.1, < 0.5", optional = true }
+uuid = { version = "0.4", optional = true }
diff --git a/postgres/Cargo.toml b/postgres/Cargo.toml
index 3c682a6f..c6b6031f 100644
--- a/postgres/Cargo.toml
+++ b/postgres/Cargo.toml
@@ -58,6 +58,6 @@ bit-vec = "0.4"
 chrono = "0.3"
 eui48 = "0.1"
 rustc-serialize = "0.3"
-serde_json = ">= 0.6, < 0.10"
+serde_json = "0.9"
 time = "0.1.14"
-uuid = ">= 0.1, < 0.5"
+uuid = "0.4"