diff --git a/packages/dapi/lib/grpcServer/handlers/platform/broadcastStateTransitionHandlerFactory.js b/packages/dapi/lib/grpcServer/handlers/platform/broadcastStateTransitionHandlerFactory.js
index a17d4969182..130a3b1ecbe 100644
--- a/packages/dapi/lib/grpcServer/handlers/platform/broadcastStateTransitionHandlerFactory.js
+++ b/packages/dapi/lib/grpcServer/handlers/platform/broadcastStateTransitionHandlerFactory.js
@@ -76,11 +76,20 @@ function broadcastStateTransitionHandlerFactory(
             .update(stBytes)
             .digest();
 
-          // TODO: Apply search filter to fetch specific state transition
           // Throw an already exist in mempool error if the ST in mempool
-          const unconfirmedTxsResponse = await requestTenderRpc('unconfirmed_txs', { limit: 100 });
+          let unconfirmedTxResponse;
+          try {
+            unconfirmedTxResponse = await requestTenderRpc(
+              'unconfirmed_tx',
+              { hash: `0x${stHash.toString('hex')}` },
+            );
+          } catch (e) {
+            if (typeof e.data !== 'string' || !e.data.includes('not found')) {
+              throw e;
+            }
+          }
 
-          if (unconfirmedTxsResponse?.txs?.includes(stBytes.toString('base64'))) {
+          if (unconfirmedTxResponse?.tx) {
             throw new AlreadyExistsGrpcError('state transition already in mempool');
           }
 
diff --git a/packages/dapi/test/unit/grpcServer/handlers/platform/broadcastStateTransitionHandlerFactory.spec.js b/packages/dapi/test/unit/grpcServer/handlers/platform/broadcastStateTransitionHandlerFactory.spec.js
index de1152d015d..0f4ba1ce66a 100644
--- a/packages/dapi/test/unit/grpcServer/handlers/platform/broadcastStateTransitionHandlerFactory.spec.js
+++ b/packages/dapi/test/unit/grpcServer/handlers/platform/broadcastStateTransitionHandlerFactory.spec.js
@@ -194,8 +194,8 @@ describe('broadcastStateTransitionHandlerFactory', () => {
       data: 'tx already exists in cache',
     };
 
-    requestTenderRpcMock.withArgs('unconfirmed_txs').resolves({
-      txs: [stateTransitionFixture.toBuffer().toString('base64')],
+    requestTenderRpcMock.withArgs('unconfirmed_tx').resolves({
+      tx: stateTransitionFixture.toBuffer().toString('base64'),
     });
 
     try {
diff --git a/packages/dashmate/configs/defaults/getBaseConfigFactory.js b/packages/dashmate/configs/defaults/getBaseConfigFactory.js
index 1614216ad2a..7b04a221c75 100644
--- a/packages/dashmate/configs/defaults/getBaseConfigFactory.js
+++ b/packages/dashmate/configs/defaults/getBaseConfigFactory.js
@@ -309,7 +309,7 @@ export default function getBaseConfigFactory() {
           tenderdash: {
             mode: 'full',
             docker: {
-              image: 'dashpay/tenderdash:1',
+              image: 'dashpay/tenderdash:1.5-dev',
             },
             p2p: {
               host: '0.0.0.0',
diff --git a/packages/dashmate/configs/getConfigFileMigrationsFactory.js b/packages/dashmate/configs/getConfigFileMigrationsFactory.js
index 16e4ab025fa..a2213122ce9 100644
--- a/packages/dashmate/configs/getConfigFileMigrationsFactory.js
+++ b/packages/dashmate/configs/getConfigFileMigrationsFactory.js
@@ -1086,6 +1086,13 @@ export default function getConfigFileMigrationsFactory(homeDir, defaultConfigs)
           });
         return configFile;
       },
+      '2.1.0-dev.1': (configFile) => {
+        Object.entries(configFile.configs)
+          .forEach(([, options]) => {
+            options.platform.drive.tenderdash.docker.image = 'dashpay/tenderdash:1.5-dev';
+          });
+        return configFile;
+      },
     };
   }