diff --git a/src/ethereum_test_fixtures/blockchain.py b/src/ethereum_test_fixtures/blockchain.py
index 9cf3b84327..3a00484eca 100644
--- a/src/ethereum_test_fixtures/blockchain.py
+++ b/src/ethereum_test_fixtures/blockchain.py
@@ -112,7 +112,7 @@ class FixtureHeader(CamelModel):
     )
     requests_hash: Annotated[Hash, HeaderForkRequirement("requests")] | None = Field(None)
     target_blob_count: Annotated[
-        ZeroPaddedHexNumber, HeaderForkRequirement("blob_count")
+        ZeroPaddedHexNumber, HeaderForkRequirement("target_blob_count")
     ] | None = Field(None)
 
     fork: Fork | None = Field(None, exclude=True)
diff --git a/src/ethereum_test_types/types.py b/src/ethereum_test_types/types.py
index 7fed44cad2..6e0e962bf9 100644
--- a/src/ethereum_test_types/types.py
+++ b/src/ethereum_test_types/types.py
@@ -389,8 +389,7 @@ class EnvironmentGeneric(CamelModel, Generic[NumberBoundTypeVar]):
     difficulty: NumberBoundTypeVar | None = Field(None, alias="currentDifficulty")
     base_fee_per_gas: NumberBoundTypeVar | None = Field(None, alias="currentBaseFee")
     excess_blob_gas: NumberBoundTypeVar | None = Field(None, alias="currentExcessBlobGas")
-
-    target_blob_count: NumberBoundTypeVar | None = Field(None, alias="currentTargetBlobGasUsed")
+    target_blob_count: NumberBoundTypeVar | None = Field(None, alias="currentTargetBlobCount")
 
     parent_difficulty: NumberBoundTypeVar | None = Field(None)
     parent_timestamp: NumberBoundTypeVar | None = Field(None)