diff --git a/backend/canisters/group_index/CHANGELOG.md b/backend/canisters/group_index/CHANGELOG.md
index 02e5fc083b..40e0a2b33c 100644
--- a/backend/canisters/group_index/CHANGELOG.md
+++ b/backend/canisters/group_index/CHANGELOG.md
@@ -11,7 +11,11 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Handle retry attempts when adding a new LocalGroupIndex ([#7091](https://github.com/open-chat-labs/open-chat/pull/7091))
 - Add logging + skip steps that have already been completed ([#7093](https://github.com/open-chat-labs/open-chat/pull/7093))
 
-## [[2.0.1519](https://github.com/open-chat-labs/open-chat/releases/tag/v2.0.1519-group_index)] - 2024-12-19
+### Fixed
+
+- Set `wasm_hash` field which was previously empty ([#7097](https://github.com/open-chat-labs/open-chat/pull/7097))
+
+## [[2.0.1528](https://github.com/open-chat-labs/open-chat/releases/tag/v2.0.1528-group_index)] - 2024-12-19
 
 ### Changed
 
diff --git a/backend/canisters/user_index/CHANGELOG.md b/backend/canisters/user_index/CHANGELOG.md
index 136cc9890c..7a01532bd2 100644
--- a/backend/canisters/user_index/CHANGELOG.md
+++ b/backend/canisters/user_index/CHANGELOG.md
@@ -11,6 +11,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Add logging + skip steps that have already been completed ([#7093](https://github.com/open-chat-labs/open-chat/pull/7093))
 - Change bot cmd number param values from u16 to f64 ([#7095](https://github.com/open-chat-labs/open-chat/pull/7095))
 
+### Fixed
+
+- Set `wasm_hash` field which was previously empty ([#7097](https://github.com/open-chat-labs/open-chat/pull/7097))
+
 ## [[2.0.1537](https://github.com/open-chat-labs/open-chat/releases/tag/v2.0.1537-user_index)] - 2024-12-19
 
 ### Changed
diff --git a/backend/libraries/types/src/canister_wasm.rs b/backend/libraries/types/src/canister_wasm.rs
index 53fb159d5f..8e19e782dd 100644
--- a/backend/libraries/types/src/canister_wasm.rs
+++ b/backend/libraries/types/src/canister_wasm.rs
@@ -28,12 +28,29 @@ pub enum UpgradeChunkedCanisterWasmResponse {
 }
 
 #[derive(CandidType, Serialize, Deserialize, Clone, Default)]
+#[serde(from = "ChunkedCanisterWasmPrevious")]
 pub struct ChunkedCanisterWasm {
     pub wasm: CanisterWasm,
     pub chunks: Vec<Hash>,
     pub wasm_hash: Hash,
 }
 
+#[derive(Deserialize)]
+pub struct ChunkedCanisterWasmPrevious {
+    pub wasm: CanisterWasm,
+    pub chunks: Vec<Hash>,
+}
+
+impl From<ChunkedCanisterWasmPrevious> for ChunkedCanisterWasm {
+    fn from(value: ChunkedCanisterWasmPrevious) -> Self {
+        ChunkedCanisterWasm {
+            wasm_hash: value.wasm.module.hash(),
+            wasm: value.wasm,
+            chunks: value.chunks,
+        }
+    }
+}
+
 impl From<CanisterWasm> for ChunkedCanisterWasm {
     fn from(value: CanisterWasm) -> Self {
         ChunkedCanisterWasm {