diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 10a0ee285..6c431f7c9 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -179,7 +179,7 @@ jobs:
         uses: hiero-ledger/hiero-solo-action@328bc84c3b00a990a151418144fd682a4eb76ea6 # v0.17
         with:
           installMirrorNode: true
-          soloVersion: v0.65.0
+          soloVersion: v0.68.0
           mirrorNodeVersion: v0.153.0
           hieroVersion: v0.73.0
 
@@ -253,7 +253,7 @@ jobs:
         uses: hiero-ledger/hiero-solo-action@328bc84c3b00a990a151418144fd682a4eb76ea6 # v0.17
         with:
           installMirrorNode: true
-          soloVersion: v0.65.0
+          soloVersion: v0.68.0
           dualMode: true
           hieroVersion: v0.73.0
           mirrorNodeVersion: v0.153.0
@@ -311,7 +311,7 @@ jobs:
         uses: hiero-ledger/hiero-solo-action@328bc84c3b00a990a151418144fd682a4eb76ea6 # v0.17
         with:
           installMirrorNode: true
-          soloVersion: v0.65.0
+          soloVersion: v0.68.0
           mirrorNodeVersion: v0.153.0
           hieroVersion: v0.73.0
 
diff --git a/examples/src/main/java/com/hedera/hashgraph/sdk/examples/FeeEstimateQueryExample.java b/examples/src/main/java/com/hedera/hashgraph/sdk/examples/FeeEstimateQueryExample.java
index 4d38220c6..d9862aa62 100644
--- a/examples/src/main/java/com/hedera/hashgraph/sdk/examples/FeeEstimateQueryExample.java
+++ b/examples/src/main/java/com/hedera/hashgraph/sdk/examples/FeeEstimateQueryExample.java
@@ -61,7 +61,9 @@ public static void main(String[] args) throws Exception {
         TransferTransaction tx = createTransferTransaction(client, recipientId);
         FeeEstimateResponse stateEstimate = estimateWithStateMode(client, tx);
         FeeEstimateResponse intrinsicEstimate = estimateWithIntrinsicMode(client, tx);
+
         compareEstimates(stateEstimate, intrinsicEstimate);
+
         demonstrateTokenCreationEstimate(client);
 
         client.close();
@@ -100,10 +102,11 @@ private static TransferTransaction createTransferTransaction(Client client, Acco
     private static FeeEstimateResponse estimateWithStateMode(Client client, TransferTransaction tx) throws Exception {
         System.out.println("\n=== Estimating Fees with STATE Mode ===");
 
-        FeeEstimateResponse stateEstimate = new FeeEstimateQuery()
+        FeeEstimateQuery query = new FeeEstimateQuery()
                 .setMode(FeeEstimateMode.STATE)
-                .setTransaction(tx)
-                .execute(client);
+                .setTransaction(tx);
+
+        FeeEstimateResponse stateEstimate = executeWithRetry(query, client);
 
         printNetworkFee(stateEstimate);
         printNodeFee(stateEstimate);
@@ -151,10 +154,11 @@ private static FeeEstimateResponse estimateWithIntrinsicMode(Client client, Tran
             throws Exception {
         System.out.println("\n=== Estimating Fees with INTRINSIC Mode ===");
 
-        FeeEstimateResponse intrinsicEstimate = new FeeEstimateQuery()
+        FeeEstimateQuery query = new FeeEstimateQuery()
                 .setMode(FeeEstimateMode.INTRINSIC)
-                .setTransaction(tx)
-                .execute(client);
+                .setTransaction(tx);
+
+        FeeEstimateResponse intrinsicEstimate = executeWithRetry(query, client);
 
         System.out.println(
                 "Network Fee Subtotal: " + intrinsicEstimate.getNetwork().getSubtotal() + " tinycents");
@@ -187,12 +191,33 @@ private static void demonstrateTokenCreationEstimate(Client client) throws Excep
                 .freezeWith(client)
                 .signWithOperator(client);
 
-        FeeEstimateResponse tokenEstimate = new FeeEstimateQuery()
+        FeeEstimateQuery query = new FeeEstimateQuery()
                 .setMode(FeeEstimateMode.STATE)
-                .setTransaction(tokenTx)
-                .execute(client);
+                .setTransaction(tokenTx);
+
+        FeeEstimateResponse tokenEstimate = executeWithRetry(query, client);
 
         System.out.println("Token Creation Estimated Fee:  " + tokenEstimate.getTotal() + " tinycents");
         System.out.println("Token Creation Estimated Fee: " + Hbar.fromTinybars(tokenEstimate.getTotal() / 100));
     }
+
+    private static FeeEstimateResponse executeWithRetry(FeeEstimateQuery query, Client client) throws Exception {
+        int maxAttempts = 5;
+        int waitMillis = 2000;
+        IllegalStateException lastException = null;
+
+        for (int attempt = 1; attempt <= maxAttempts; attempt++) {
+            try {
+                return query.execute(client);
+            } catch (IllegalStateException e) {
+                lastException = e;
+                System.err.println("Attempt " + attempt + " failed: " + e.getMessage());
+                if (attempt < maxAttempts) {
+                    System.out.println("Waiting " + (waitMillis / 1000) + " seconds before retry...");
+                    Thread.sleep(waitMillis);
+                }
+            }
+        }
+        throw new RuntimeException("Failed to execute FeeEstimateQuery after " + maxAttempts + " attempts", lastException);
+    }
 }
diff --git a/sdk/src/testIntegration/java/com/hedera/hashgraph/sdk/test/integration/ContractFunctionParametersIntegrationTest.java b/sdk/src/testIntegration/java/com/hedera/hashgraph/sdk/test/integration/ContractFunctionParametersIntegrationTest.java
index 9990122c5..f51cd46c8 100644
--- a/sdk/src/testIntegration/java/com/hedera/hashgraph/sdk/test/integration/ContractFunctionParametersIntegrationTest.java
+++ b/sdk/src/testIntegration/java/com/hedera/hashgraph/sdk/test/integration/ContractFunctionParametersIntegrationTest.java
@@ -2835,6 +2835,8 @@ void canCallContractFunctionInt200Min() throws Exception {
     void canCallContractFunctionInt200Max() throws Exception {
         BigInteger int200Max = new BigInteger("803469022129495137770981046170581301261101496891396417650687");
 
+        Thread.sleep(10); // Avoid DUPLICATE_TRANSACTION
+
         var response = new ContractCallQuery()
                 .setContractId(contractId)
                 .setGas(30_000)