diff --git a/app/data/compose/docker-compose-fixturenet-optimism.yml b/app/data/compose/docker-compose-fixturenet-optimism.yml
index c5804a14..ddf7e290 100644
--- a/app/data/compose/docker-compose-fixturenet-optimism.yml
+++ b/app/data/compose/docker-compose-fixturenet-optimism.yml
@@ -70,6 +70,7 @@ services:
     command: "/run-op-geth.sh"
     ports:
       - "0.0.0.0:8545:8545"
+      - "0.0.0.0:8546:8546"
     healthcheck:
       test: ["CMD", "nc", "-vz", "localhost:8545"]
       interval: 30s
diff --git a/app/data/stacks/mobymask-v3/stack.yml b/app/data/stacks/mobymask-v3/stack.yml
index b07b3680..fce0f312 100644
--- a/app/data/stacks/mobymask-v3/stack.yml
+++ b/app/data/stacks/mobymask-v3/stack.yml
@@ -2,11 +2,11 @@ version: "1.0"
 description: "MobyMask v3 stack"
 name: mobymask-v3
 repos:
-  - github.com/cerc-io/ts-nitrov0.1.12
-  - github.com/cerc-io/watcher-ts@v0.2.57
-  - github.com/cerc-io/mobymask-v2-watcher-ts@v3 # TODO: Update after fixes
+  - github.com/cerc-io/ts-nitro@v0.1.13
+  - github.com/cerc-io/watcher-ts@v0.2.63
+  - github.com/cerc-io/mobymask-v2-watcher-ts@v0.2.2
   - github.com/cerc-io/MobyMask@v0.1.3
-  - github.com/cerc-io/mobymask-ui@v0.2.0
+  - github.com/cerc-io/mobymask-ui@v0.2.1
 containers:
   - cerc/nitro-contracts
   - cerc/watcher-ts
diff --git a/app/data/stacks/mobymask-v3/watcher.md b/app/data/stacks/mobymask-v3/watcher.md
index 1aa63c1d..c21fbab3 100644
--- a/app/data/stacks/mobymask-v3/watcher.md
+++ b/app/data/stacks/mobymask-v3/watcher.md
@@ -23,7 +23,7 @@ laconic-so --stack mobymask-v3 build-containers --exclude cerc/mobymask-ui
 Create and update an env file to be used in the next step ([defaults](../../config/watcher-mobymask-v3/mobymask-params.env)):
 
   ```bash
-  # External ETH RPC endpoint (L2 Optimism geth)
+  # External ETH RPC endpoint for contract(s) deployment
   CERC_ETH_RPC_ENDPOINT=
 
   # External ETH RPC endpoint used for queries in the watcher
@@ -32,6 +32,9 @@ Create and update an env file to be used in the next step ([defaults](../../conf
   # External ETH RPC endpoint used for mutations in the watcher
   CERC_ETH_RPC_MUTATION_ENDPOINT=
 
+  # External ETH endpoint used by watcher's Nitro node
+  CERC_NITRO_CHAIN_URL=
+
   # Specify the an account PK for contract deployment
   CERC_PRIVATE_KEY_DEPLOYER=