diff --git a/config/protocol.unit_testnet.yml b/config/protocol.unit_testnet.yml
index d2753f6e1c..5d3f80d0a8 100644
--- a/config/protocol.unit_testnet.yml
+++ b/config/protocol.unit_testnet.yml
@@ -18,7 +18,7 @@ ProtocolConfiguration:
   VerifyTransactions: true
   P2PSigExtensions: true
   Hardforks:
-    Aspidochelone: 25
+#    Aspidochelone: 25
 
 ApplicationConfiguration:
   SkipBlockVerification: false
diff --git a/pkg/neotest/chain/chain.go b/pkg/neotest/chain/chain.go
index ad5b0ecfb4..4f5f48494e 100644
--- a/pkg/neotest/chain/chain.go
+++ b/pkg/neotest/chain/chain.go
@@ -258,18 +258,13 @@ func NewMultiWithOptionsNoCheck(t testing.TB, options *Options) (*core.Blockchai
 		options = &Options{}
 	}
 
-	cfg := config.Blockchain{
-		ProtocolConfiguration: config.ProtocolConfiguration{
-			Magic:              netmode.UnitTestNet,
-			MaxTraceableBlocks: MaxTraceableBlocks,
-			TimePerBlock:       TimePerBlock,
-			StandbyCommittee:   standByCommittee,
-			ValidatorsCount:    4,
-			VerifyTransactions: true,
-		},
+	cfg, err := config.Load(config.DefaultConfigPath, netmode.UnitTestNet)
+	if err != nil {
+		return nil, nil, nil, err
 	}
+	bcfg := cfg.Blockchain()
 	if options.BlockchainConfigHook != nil {
-		options.BlockchainConfigHook(&cfg)
+		options.BlockchainConfigHook(&bcfg)
 	}
 
 	store := options.Store
@@ -282,7 +277,7 @@ func NewMultiWithOptionsNoCheck(t testing.TB, options *Options) (*core.Blockchai
 		logger = zaptest.NewLogger(t)
 	}
 
-	bc, err := core.NewBlockchain(store, cfg, logger)
+	bc, err := core.NewBlockchain(store, bcfg, logger)
 	if err == nil && !options.SkipRun {
 		go bc.Run()
 		t.Cleanup(bc.Close)
diff --git a/pkg/services/rpcsrv/client_test.go b/pkg/services/rpcsrv/client_test.go
index 9f24c7b53f..750a57f886 100644
--- a/pkg/services/rpcsrv/client_test.go
+++ b/pkg/services/rpcsrv/client_test.go
@@ -2447,8 +2447,11 @@ func TestClient_GetStorageHistoric(t *testing.T) {
 }
 
 func TestClient_GetVersion_Hardforks(t *testing.T) {
-	_, _, httpSrv := initServerWithInMemoryChain(t)
-
+	_, _, httpSrv := initClearServerWithCustomConfig(t, func(cfg *config.Config) {
+		cfg.ProtocolConfiguration.Hardforks = map[string]uint32{
+			"Aspidochelone": 25,
+		}
+	})
 	c, err := rpcclient.New(context.Background(), httpSrv.URL, rpcclient.Options{})
 	require.NoError(t, err)
 	t.Cleanup(c.Close)
diff --git a/pkg/services/rpcsrv/server_test.go b/pkg/services/rpcsrv/server_test.go
index 5041b44bca..df0eeaf2f3 100644
--- a/pkg/services/rpcsrv/server_test.go
+++ b/pkg/services/rpcsrv/server_test.go
@@ -121,7 +121,7 @@ const (
 	// not yet deployed to the testing basic chain.
 	invokescriptContractAVM = "VwIADBQBDAMOBQYMDQIODw0DDgcJAAAAAErZMCQE2zBwaEH4J+yMqiYEEUAMFA0PAwIJAAIBAwcDBAUCAQAOBgwJStkwJATbMHFpQfgn7IyqJgQSQBNA"
 	// block20StateRootLE is an LE stateroot of block #20 of basic testing chain.
-	block20StateRootLE = "394e20adf99a6ba160df7351770dfb193ee8af174b7b3ed45f4e2ae8c43694e8"
+	block20StateRootLE = "bb56d46daf7da0f83102b89737402f3dff0951ec1a35d8da3851de49e0c73e97"
 )
 
 var (