diff --git a/geth/genesis.json b/geth/genesis.json
index aa20d22c..e031182f 100644
--- a/geth/genesis.json
+++ b/geth/genesis.json
@@ -24,6 +24,6 @@
     "extraData": "0x0000000000000000000000000000000000000000000000000000000000000000",
     "gasLimit": "0x47e7c4",
     "difficulty": "0x0",
-    "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",
+    "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
     "alloc": {}
 }
diff --git a/geth/types.py b/geth/types.py
index 85b80768..01b1e15b 100644
--- a/geth/types.py
+++ b/geth/types.py
@@ -48,12 +48,17 @@ class GethKwargsTypedDict(TypedDict, total=False):
 
 class GenesisDataTypedDict(TypedDict, total=False):
     alloc: dict[str, dict[str, Any]]
+    baseFeePerGas: str
+    blobGasUsed: str
     coinbase: str
     config: dict[str, Any]
     difficulty: str
+    excessBlobGas: str
     extraData: str
     gasLimit: str
-    mixhash: str
+    gasUsed: str
+    mixHash: str
     nonce: str
+    number: str
     parentHash: str
     timestamp: str
diff --git a/geth/utils/validation.py b/geth/utils/validation.py
index 19e9d4bb..c9e18e88 100644
--- a/geth/utils/validation.py
+++ b/geth/utils/validation.py
@@ -70,6 +70,7 @@ def validate_geth_kwargs(geth_kwargs: GethKwargsTypedDict) -> None:
 
 
 class GenesisDataConfig(BaseModel):
+    chainId: int = 0
     ethash: dict[str, Any] = {}  # so that geth treats config as PoW -> PoS transition
     homesteadBlock: int = 0
     daoForkBlock: int = 0
@@ -97,15 +98,20 @@ class GenesisDataConfig(BaseModel):
 
 class GenesisData(BaseModel):
     alloc: dict[str, dict[str, Any]] = {}
+    baseFeePerGas: str = "0x0"
+    blobGasUsed: str = "0x0"
     coinbase: str = "0x3333333333333333333333333333333333333333"
     config: dict[str, Any] = GenesisDataConfig().model_dump()
     difficulty: str = "0x0"
+    excessBlobGas: str = "0x0"
     extraData: str = (
         "0x0000000000000000000000000000000000000000000000000000000000000000"
     )
     gasLimit: str = "0x47e7c4"
-    mixhash: str = "0x0000000000000000000000000000000000000000000000000000000000000000"
+    gasUsed: str = "0x0"
+    mixHash: str = "0x0000000000000000000000000000000000000000000000000000000000000000"
     nonce: str = "0x0"
+    number: str = "0x0"
     parentHash: str = (
         "0x0000000000000000000000000000000000000000000000000000000000000000"
     )
diff --git a/newsfragments/221.bugfix.rst b/newsfragments/221.bugfix.rst
new file mode 100644
index 00000000..430b16ee
--- /dev/null
+++ b/newsfragments/221.bugfix.rst
@@ -0,0 +1 @@
+Add missing fields for genesis data. Change mixhash -> mixHash to more closely match Geth
diff --git a/tests/core/utility/test_validation.py b/tests/core/utility/test_validation.py
index 55fb8372..3d4a2621 100644
--- a/tests/core/utility/test_validation.py
+++ b/tests/core/utility/test_validation.py
@@ -104,8 +104,11 @@ def test_validate_genesis_data_bad(genesis_data):
             },
             {
                 "alloc": {},
+                "baseFeePerGas": "0x0",
+                "blobGasUsed": "0x0",
                 "coinbase": "0x3333333333333333333333333333333333333333",
                 "config": {
+                    "chainId": 0,
                     "ethash": {},
                     "homesteadBlock": 0,
                     "daoForkBlock": 0,
@@ -127,10 +130,13 @@ def test_validate_genesis_data_bad(genesis_data):
                     "cancunTime": 0,
                 },
                 "difficulty": "0x00012131",
+                "excessBlobGas": "0x0",
                 "extraData": "0x0000000000000000000000000000000000000000000000000000000000000000",  # noqa: E501
                 "gasLimit": "0x47e7c4",
-                "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",  # noqa: E501
+                "gasUsed": "0x0",
+                "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",  # noqa: E501
                 "nonce": "abc",
+                "number": "0x0",
                 "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",  # noqa: E501
                 "timestamp": "1234",
             },
@@ -150,8 +156,11 @@ def test_validate_genesis_data_bad(genesis_data):
             },
             {
                 "alloc": {},
+                "baseFeePerGas": "0x0",
+                "blobGasUsed": "0x0",
                 "coinbase": "0x3333333333333333333333333333333333333333",
                 "config": {
+                    "chainId": 0,
                     "ethash": {},
                     "homesteadBlock": 5,
                     "daoForkBlock": 1,
@@ -173,10 +182,13 @@ def test_validate_genesis_data_bad(genesis_data):
                     "cancunTime": 0,
                 },
                 "difficulty": "0x00012131",
+                "excessBlobGas": "0x0",
                 "extraData": "0x0000000000000000000000000000000000000000000000000000000000000000",  # noqa: E501
                 "gasLimit": "0x47e7c4",
-                "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",  # noqa: E501
+                "gasUsed": "0x0",
+                "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",  # noqa: E501
                 "nonce": "abc",
+                "number": "0x0",
                 "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",  # noqa: E501
                 "timestamp": "0x0",
             },