diff --git a/config/config.go b/config/config.go
index bda9d07c4..f45430432 100644
--- a/config/config.go
+++ b/config/config.go
@@ -47,6 +47,7 @@ type (
 		SecondsPerBlock         int       `yaml:"SecondsPerBlock"`
 		LowPriorityThreshold    float64   `yaml:"LowPriorityThreshold"`
 		MaxTransactionsPerBlock int64     `yaml:"MaxTransactionsPerBlock"`
+		MemPoolSize             int       `yaml:"MemPoolSize"`
 		StandbyValidators       []string  `yaml:"StandbyValidators"`
 		SeedList                []string  `yaml:"SeedList"`
 		SystemFee               SystemFee `yaml:"SystemFee"`
diff --git a/config/protocol.mainnet.yml b/config/protocol.mainnet.yml
index 2e50755ae..93aeae641 100644
--- a/config/protocol.mainnet.yml
+++ b/config/protocol.mainnet.yml
@@ -3,6 +3,7 @@ ProtocolConfiguration:
   AddressVersion: 23
   SecondsPerBlock: 15
   LowPriorityThreshold: 0.001
+  MemPoolSize: 50000
   StandbyValidators:
   - 03b209fd4f53a7170ea4444e0cb0a6bb6a53c2bd016926989cf85f9b0fba17a70c
   - 02df48f60e8f3e01c48ff40b9b7f1310d7a8b2a193188befe1c2e3df740e895093
diff --git a/config/protocol.privnet.docker.four.yml b/config/protocol.privnet.docker.four.yml
index 2fe502d32..94e37b0ff 100644
--- a/config/protocol.privnet.docker.four.yml
+++ b/config/protocol.privnet.docker.four.yml
@@ -3,6 +3,7 @@ ProtocolConfiguration:
   AddressVersion: 23
   SecondsPerBlock: 15
   LowPriorityThreshold: 0.000
+  MemPoolSize: 50000
   StandbyValidators:
     - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2
     - 02103a7f7dd016558597f7960d27c516a4394fd968b9e65155eb4b013e4040406e
diff --git a/config/protocol.privnet.docker.one.yml b/config/protocol.privnet.docker.one.yml
index 95792063c..180db8c2b 100644
--- a/config/protocol.privnet.docker.one.yml
+++ b/config/protocol.privnet.docker.one.yml
@@ -3,6 +3,7 @@ ProtocolConfiguration:
   AddressVersion: 23
   SecondsPerBlock: 15
   LowPriorityThreshold: 0.000
+  MemPoolSize: 50000
   StandbyValidators:
     - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2
     - 02103a7f7dd016558597f7960d27c516a4394fd968b9e65155eb4b013e4040406e
diff --git a/config/protocol.privnet.docker.single.yml b/config/protocol.privnet.docker.single.yml
index fbc946ac8..1a56ec1ad 100644
--- a/config/protocol.privnet.docker.single.yml
+++ b/config/protocol.privnet.docker.single.yml
@@ -3,6 +3,7 @@ ProtocolConfiguration:
   AddressVersion: 23
   SecondsPerBlock: 1
   LowPriorityThreshold: 0.001
+  MemPoolSize: 50000
   StandbyValidators:
     - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2
   SeedList:
diff --git a/config/protocol.privnet.docker.three.yml b/config/protocol.privnet.docker.three.yml
index b36dae766..4d3ab9553 100644
--- a/config/protocol.privnet.docker.three.yml
+++ b/config/protocol.privnet.docker.three.yml
@@ -3,6 +3,7 @@ ProtocolConfiguration:
   AddressVersion: 23
   SecondsPerBlock: 15
   LowPriorityThreshold: 0.000
+  MemPoolSize: 50000
   StandbyValidators:
     - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2
     - 02103a7f7dd016558597f7960d27c516a4394fd968b9e65155eb4b013e4040406e
diff --git a/config/protocol.privnet.docker.two.yml b/config/protocol.privnet.docker.two.yml
index 8406c4a19..1c6f80e02 100644
--- a/config/protocol.privnet.docker.two.yml
+++ b/config/protocol.privnet.docker.two.yml
@@ -3,6 +3,7 @@ ProtocolConfiguration:
   AddressVersion: 23
   SecondsPerBlock: 15
   LowPriorityThreshold: 0.000
+  MemPoolSize: 50000
   StandbyValidators:
     - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2
     - 02103a7f7dd016558597f7960d27c516a4394fd968b9e65155eb4b013e4040406e
diff --git a/config/protocol.privnet.yml b/config/protocol.privnet.yml
index 6166bd308..8e2c092d6 100644
--- a/config/protocol.privnet.yml
+++ b/config/protocol.privnet.yml
@@ -3,6 +3,7 @@ ProtocolConfiguration:
   AddressVersion: 23
   SecondsPerBlock: 15
   LowPriorityThreshold: 0.000
+  MemPoolSize: 50000
   StandbyValidators:
     - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2
     - 02103a7f7dd016558597f7960d27c516a4394fd968b9e65155eb4b013e4040406e
diff --git a/config/protocol.testnet.yml b/config/protocol.testnet.yml
index f936dc261..91b594bb8 100644
--- a/config/protocol.testnet.yml
+++ b/config/protocol.testnet.yml
@@ -3,6 +3,7 @@ ProtocolConfiguration:
   AddressVersion: 23
   SecondsPerBlock: 15
   LowPriorityThreshold: 0.000
+  MemPoolSize: 50000
   StandbyValidators:
   - 0327da12b5c40200e9f65569476bbff2218da4f32548ff43b6387ec1416a231ee8
   - 026ce35b29147ad09e4afe4ec4a7319095f08198fa8babbe3c56e970b143528d22
diff --git a/config/protocol.unit_testnet.yml b/config/protocol.unit_testnet.yml
index 09cfef518..7a89c606f 100644
--- a/config/protocol.unit_testnet.yml
+++ b/config/protocol.unit_testnet.yml
@@ -3,6 +3,7 @@ ProtocolConfiguration:
   AddressVersion: 23
   SecondsPerBlock: 15
   LowPriorityThreshold: 0.000
+  MemPoolSize: 50000
   StandbyValidators:
     - 02b3622bf4017bdfe317c58aed5f4c753f206b7db896046fa7d774bbc4bf7f8dc2
     - 02103a7f7dd016558597f7960d27c516a4394fd968b9e65155eb4b013e4040406e
diff --git a/pkg/core/blockchain.go b/pkg/core/blockchain.go
index c24de0535..4b3fe33d7 100644
--- a/pkg/core/blockchain.go
+++ b/pkg/core/blockchain.go
@@ -37,6 +37,8 @@ const (
 	// contain any relationship between the two, so we should follow this
 	// behavior.
 	registeredAssetLifetime = 2 * 2000000
+
+	defaultMemPoolSize = 50000
 )
 
 var (
@@ -95,6 +97,10 @@ func NewBlockchain(s storage.Store, cfg config.ProtocolConfiguration, log *zap.L
 		return nil, errors.New("empty logger")
 	}
 
+	if cfg.MemPoolSize <= 0 {
+		cfg.MemPoolSize = defaultMemPoolSize
+		log.Info("mempool size is not set or wrong, setting default value", zap.Int("MemPoolSize", cfg.MemPoolSize))
+	}
 	bc := &Blockchain{
 		config:        cfg,
 		dao:           newDao(s),
@@ -102,7 +108,7 @@ func NewBlockchain(s storage.Store, cfg config.ProtocolConfiguration, log *zap.L
 		headersOpDone: make(chan struct{}),
 		stopCh:        make(chan struct{}),
 		runToExitCh:   make(chan struct{}),
-		memPool:       mempool.NewMemPool(50000),
+		memPool:       mempool.NewMemPool(cfg.MemPoolSize),
 		keyCache:      make(map[util.Uint160]map[string]*keys.PublicKey),
 		log:           log,
 	}