diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 000000000..c2b17bf1a
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+*.vy linguist-language=Python
diff --git a/Makefile b/Makefile
index 2b165ad7d..51bff90d0 100644
--- a/Makefile
+++ b/Makefile
@@ -91,7 +91,7 @@ install_deposit_contract_test: $(PY_SPEC_ALL_TARGETS)
 
 compile_deposit_contract:
 	cd $(DEPOSIT_CONTRACT_DIR); . venv/bin/activate; \
-	python tool/compile_deposit_contract.py contracts/validator_registration.v.py;
+	python tool/compile_deposit_contract.py contracts/validator_registration.vy;
 
 test_deposit_contract:
 	cd $(DEPOSIT_CONTRACT_DIR); . venv/bin/activate; \
diff --git a/deposit_contract/contracts/validator_registration.v.py b/deposit_contract/contracts/validator_registration.vy
similarity index 100%
rename from deposit_contract/contracts/validator_registration.v.py
rename to deposit_contract/contracts/validator_registration.vy
diff --git a/deposit_contract/tests/contracts/utils.py b/deposit_contract/tests/contracts/utils.py
index de7c54489..12eac5832 100644
--- a/deposit_contract/tests/contracts/utils.py
+++ b/deposit_contract/tests/contracts/utils.py
@@ -5,7 +5,7 @@ DIR = os.path.dirname(__file__)
 
 
 def get_deposit_contract_code():
-    file_path = os.path.join(DIR, './../../contracts/validator_registration.v.py')
+    file_path = os.path.join(DIR, './../../contracts/validator_registration.vy')
     deposit_contract_code = open(file_path).read()
     return deposit_contract_code
 
diff --git a/specs/core/0_deposit-contract.md b/specs/core/0_deposit-contract.md
index c9f366330..11be41b86 100644
--- a/specs/core/0_deposit-contract.md
+++ b/specs/core/0_deposit-contract.md
@@ -61,6 +61,6 @@ Every Ethereum 1.0 deposit emits a `DepositEvent` log for consumption by the bea
 
 ## Vyper code
 
-The deposit contract source code, written in Vyper, is available [here](../../deposit_contract/contracts/validator_registration.v.py).
+The deposit contract source code, written in Vyper, is available [here](../../deposit_contract/contracts/validator_registration.vy).
 
 *Note*: To save on gas, the deposit contract uses a progressive Merkle root calculation algorithm that requires only O(log(n)) storage. See [here](https://github.com/ethereum/research/blob/master/beacon_chain_impl/progressive_merkle_tree.py) for a Python implementation, and [here](https://github.com/runtimeverification/verified-smart-contracts/blob/master/deposit/formal-incremental-merkle-tree-algorithm.pdf) for a formal correctness proof.