diff --git a/.github/workflows/open-pr.yml b/.github/workflows/open-pr.yml
index 0cf28af7f..bf5a85ac8 100644
--- a/.github/workflows/open-pr.yml
+++ b/.github/workflows/open-pr.yml
@@ -23,6 +23,9 @@ jobs:
           go-version-file: "go.mod"
           check-latest: true
           cache: true
+      - uses: cachix/install-nix-action@3715ab1a11cac9e991980d7b4a28d80c7ebdd8f9 # nix:v2.24.6
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
       - name: Run changes
         id: run
         run: ${{ inputs.run }}
diff --git a/pkg/solana/txm/txm_internal_test.go b/pkg/solana/txm/txm_internal_test.go
index adfa273f4..17b73d0e6 100644
--- a/pkg/solana/txm/txm_internal_test.go
+++ b/pkg/solana/txm/txm_internal_test.go
@@ -680,6 +680,7 @@ func TestTxm_Enqueue(t *testing.T) {
 	cfg := config.NewDefault()
 	mc := mocks.NewReaderWriter(t)
 	mc.On("SendTx", mock.Anything, mock.Anything).Return(solana.Signature{}, nil).Maybe()
+	mc.On("SimulateTx", mock.Anything, mock.Anything, mock.Anything).Return(&rpc.SimulateTransactionResult{}, nil).Maybe()
 	ctx := tests.Context(t)
 
 	// mock solana keystore
diff --git a/scripts/update-solana.sh b/scripts/update-solana.sh
index 992301e8c..030026f33 100755
--- a/scripts/update-solana.sh
+++ b/scripts/update-solana.sh
@@ -41,7 +41,7 @@ else
   cd integration-tests
   sed -i -e "s~$testVersion~$latestVersion~" testconfig/default.toml
   cd ..
-  sed -i -e "s~$containerVersion~$latestContainer~" scripts/setup-localnet/localnet.sh
+  sed -i -e "s~$localnetVersion~$latestLocalnet~" scripts/setup-localnet/localnet.sh
   sed -i -e "s~$nixVersion~$latestNix~" solana.nix
 fi