diff --git a/Cargo.toml b/Cargo.toml
index 2ed7bd522..e4bd0699a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -188,12 +188,12 @@ members= [
 ]
 
 [workspace.dependencies]
-serde = "1.0.171"
+serde = "=1.0.171"
 serde_bytes = "*"
-chrono = { version = "0.4.22", default-features = false, features = ["clock", "std", "oldtime", "serde"] }
-hdi = "0.3.1"
-hdk = "0.2.1"
-holochain = "0.2.1"
-holo_hash = "0.2.1"
-holochain_serialized_bytes = "0.0.51"
-holochain_zome_types = { version = "0.2.1", default-features = false }
+chrono = { version = "=0.4.22", default-features = false, features = ["clock", "std", "oldtime", "serde"] }
+hdi = "=0.3.1"
+hdk = "=0.2.1"
+holochain = "=0.2.1"
+holo_hash = "=0.2.1"
+holochain_serialized_bytes = "=0.0.51"
+holochain_zome_types = { version = "=0.2.1", default-features = false }