diff --git a/VERSION b/VERSION
index 7d2ed7c7..cd57a8b9 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.1.4
+2.1.5
diff --git a/requirements.txt b/requirements.txt
index 05c9b8ee..f748eb9e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-skale.py==5.8dev4
+skale.py==6.0dev0
diff --git a/tests/docker_test.py b/tests/docker_test.py
index 412301fb..4ce6ff8b 100644
--- a/tests/docker_test.py
+++ b/tests/docker_test.py
@@ -51,8 +51,8 @@ def make_tx(w3, wallet, failed=False):
     number = 3 if failed else 4
     return tester.functions.setOnlyEven(
         number
-    ).buildTransaction({
-        'gasPrice': w3.eth.gasPrice,
+    ).build_transaction({
+        'gasPrice': w3.eth.gas_price,
         'gas': DEFAULT_GAS,
         'from': wallet.address
     })
diff --git a/tests/processor_test.py b/tests/processor_test.py
index af6f48cd..48be47a5 100644
--- a/tests/processor_test.py
+++ b/tests/processor_test.py
@@ -31,8 +31,8 @@ def make_tx(w3, wallet, failed=False):
     number = 3 if failed else 4
     return tester.functions.setOnlyEven(
         number
-    ).buildTransaction({
-        'gasPrice': w3.eth.gasPrice,
+    ).build_transaction({
+        'gasPrice': w3.eth.gas_price,
         'gas': DEFAULT_GAS,
         'from': wallet.address
     })
diff --git a/tests/utils/account.py b/tests/utils/account.py
index 8894fe34..2c167461 100644
--- a/tests/utils/account.py
+++ b/tests/utils/account.py
@@ -19,11 +19,11 @@ def send_eth(
         'to': address,
         'value': amount,
         'gas': 8000000,
-        'gasPrice': w3.eth.gasPrice
+        'gasPrice': w3.eth.gas_price
     }
     signed_txn = wallet.sign(tx)
-    h = w3.eth.sendRawTransaction(signed_txn.rawTransaction)
-    w3.eth.waitForTransactionReceipt(h, timeout=60)
+    h = w3.eth.send_raw_transaction(signed_txn.rawTransaction)
+    w3.eth.wait_for_transaction_receipt(h, timeout=60)
 
 
 def generate_address(w3: Web3) -> str:
diff --git a/transaction_manager/eth.py b/transaction_manager/eth.py
index b7d1e0eb..54d493c8 100644
--- a/transaction_manager/eth.py
+++ b/transaction_manager/eth.py
@@ -86,7 +86,7 @@ def chain_id(self) -> int:
         return self.w3.eth.chain_id
 
     def get_balance(self, address: str) -> int:
-        checksum_addres = self.w3.toChecksumAddress(address)
+        checksum_addres = self.w3.to_checksum_address(address)
         return self.w3.eth.get_balance(checksum_addres)
 
     TX_ATTRS = [
@@ -190,7 +190,7 @@ def send_tx(self, signed_tx: Dict) -> str:
         return tx_hash
 
     def get_nonce(self, address: str) -> int:
-        checksum_addres = self.w3.toChecksumAddress(address)
+        checksum_addres = self.w3.to_checksum_address(address)
         return self.w3.eth.get_transaction_count(checksum_addres)
 
     def wait_for_blocks(