diff --git a/pyevmasm/__main__.py b/pyevmasm/__main__.py
index ebc8dc5..c8ffe74 100755
--- a/pyevmasm/__main__.py
+++ b/pyevmasm/__main__.py
@@ -64,8 +64,8 @@ def main():
         "--fork",
         default=DEFAULT_FORK,
         type=str,
-        help="Fork, default: london. "
-        "Possible: frontier, homestead, tangerine_whistle, spurious_dragon, byzantium, constantinople, istanbul, london, serenity. "
+        help="Fork, default: cancun. "
+        "Possible: frontier, homestead, tangerine_whistle, spurious_dragon, byzantium, constantinople, istanbul, london, shanghai, cancun, serenity. "
         "Also an unsigned block number is accepted to select the fork.",
     )
 
diff --git a/pyevmasm/evmasm.py b/pyevmasm/evmasm.py
index 668b4ba..816ed6d 100644
--- a/pyevmasm/evmasm.py
+++ b/pyevmasm/evmasm.py
@@ -5,7 +5,7 @@
 from future.builtins import next, bytes  # type: ignore
 import copy
 
-DEFAULT_FORK = "shanghai"
+DEFAULT_FORK = "cancun"
 
 """
     Example use::
@@ -299,6 +299,7 @@ def writes_to_stack(self):
     def writes_to_memory(self):
         """True if the instruction writes to memory"""
         return self.semantics in {
+            "MCOPY",
             "MSTORE",
             "MSTORE8",
             "CALLDATACOPY",
@@ -316,6 +317,7 @@ def reads_from_memory(self):
         """True if the instruction reads from memory"""
         return self.semantics in {
             "SHA3",
+            "MCOPY",
             "MLOAD",
             "CREATE",
             "CALL",
@@ -336,6 +338,16 @@ def reads_from_storage(self):
         """True if the instruction reads from the storage"""
         return self.semantics == "SLOAD"
 
+    @property
+    def writes_to_transient_storage(self):
+        """True if the instruction writes to the transient storage"""
+        return self.semantics == "TSTORE"
+
+    @property
+    def reads_from_transient_storage(self):
+        """True if the instruction reads from the transient storage"""
+        return self.semantics == "TLOAD"
+
     @property
     def is_terminator(self):
         """True if the instruction is a basic block terminator"""
@@ -1101,6 +1113,25 @@ def __repr__(self):
     shanghai_instruction_table, previous_fork=london_instruction_table
 )
 
+cancun_instruction_table = {
+    0x49: ("BLOBHASH", 0, 1, 1, 3, "Get versioned hashes"),
+    0x4A: (
+        "BLOBBASEFEE",
+        0,
+        0,
+        1,
+        2,
+        "Returns the value of the blob base-fee of the current block",
+    ),
+    0x5C: ("TLOAD", 0, 1, 1, 100, "Load word from transient storage"),
+    0x5D: ("TSTORE", 0, 2, 0, 100, "Save word to transient storage"),
+    0x5E: ("MCOPY", 0, 3, 0, 3, "Copy memory areas"),
+}
+
+cancun_instruction_table = InstructionTable(  # type: ignore
+    cancun_instruction_table, previous_fork=shanghai_instruction_table
+)
+
 accepted_forks = (
     "frontier",
     "homestead",
@@ -1112,7 +1143,8 @@ def __repr__(self):
     "serenity",
     "istanbul",
     "london",
-    "shanghai"
+    "shanghai",
+    "cancun",
 )
 
 
@@ -1128,6 +1160,7 @@ def __repr__(self):
     "istanbul": istanbul_instruction_table,
     "london": london_instruction_table,
     "shanghai": shanghai_instruction_table,
+    "cancun": cancun_instruction_table,
 }
 
 
@@ -1163,6 +1196,7 @@ def block_to_fork(block_number):
         9069000: "istanbul",
         12965000: "london",
         17034870: "shanghai",
+        19426587: "cancun",
         99999999: "serenity",  # to be replaced after Serenity launch
     }
     fork_names = list(forks_by_block.values())
diff --git a/tests/test_EVMAssembler.py b/tests/test_EVMAssembler.py
index 1a44b68..43ab08a 100644
--- a/tests/test_EVMAssembler.py
+++ b/tests/test_EVMAssembler.py
@@ -136,6 +136,33 @@ def test_shanghai_fork(self):
         self.assertTrue(insn.pushes == 1)
         self.assertTrue(insn.operand_size == 0)
 
+    def test_cancun_fork(self):
+        insn = EVMAsm.disassemble_one(b"\x49", fork="cancun")
+        self.assertTrue(insn.mnemonic == "BLOBHASH")
+        self.assertTrue(insn.fee == 3)
+        self.assertTrue(insn.pops == 1)
+        self.assertTrue(insn.pushes == 1)
+        insn = EVMAsm.disassemble_one(b"\x4a", fork="cancun")
+        self.assertTrue(insn.mnemonic == "BLOBBASEFEE")
+        self.assertTrue(insn.fee == 2)
+        self.assertTrue(insn.pops == 0)
+        self.assertTrue(insn.pushes == 1)
+        insn = EVMAsm.disassemble_one(b"\x5c", fork="cancun")
+        self.assertTrue(insn.mnemonic == "TLOAD")
+        self.assertTrue(insn.fee == 100)
+        self.assertTrue(insn.pops == 1)
+        self.assertTrue(insn.pushes == 1)
+        insn = EVMAsm.disassemble_one(b"\x5d", fork="cancun")
+        self.assertTrue(insn.mnemonic == "TSTORE")
+        self.assertTrue(insn.fee == 100)
+        self.assertTrue(insn.pops == 2)
+        self.assertTrue(insn.pushes == 0)
+        insn = EVMAsm.disassemble_one(b"\x5e", fork="cancun")
+        self.assertTrue(insn.mnemonic == "MCOPY")
+        self.assertTrue(insn.fee == 3)
+        self.assertTrue(insn.pops == 3)
+        self.assertTrue(insn.pushes == 0)
+
     def test_assemble_DUP1_regression(self):
         insn = EVMAsm.assemble_one("DUP1")
         self.assertEqual(insn.mnemonic, "DUP1")