diff --git a/Pipfile b/Pipfile
index 628337b..2fa6049 100644
--- a/Pipfile
+++ b/Pipfile
@@ -6,7 +6,7 @@ verify_ssl = true
 [dev-packages]
 
 [packages]
-vyper = "==0.2.12"
+vyper = "==0.3.3"
 
 [requires]
 python_version = "3.7"
diff --git a/Pipfile.lock b/Pipfile.lock
index d1cd00e..a50d76d 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "da8ad20de54f163be00f924d47d392cd3ec65dc63998a782f3f4fa818b65391e"
+            "sha256": "6419d9bf5015b4b62cee81eba7bdbaffc01ffac57c079de5754741c339d54daa"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -18,51 +18,69 @@
     "default": {
         "asttokens": {
             "hashes": [
-                "sha256:766d3352908730efb20b95ae22db0f1cb1bedb67c6071fcffb5c236ea673f2f7",
-                "sha256:a42e57e28f2ac1c85ed9b1f84109401427e5c63c04f61d15b8842b027eec5128"
+                "sha256:0844691e88552595a6f4a4281a9f7f79b8dd45ca4ccea82e5e05b4bbdb76705c",
+                "sha256:9a54c114f02c7a9480d56550932546a3f1fe71d8a02f1bc7ccd0ee3ee35cf4d5"
             ],
-            "version": "==2.0.4"
+            "version": "==2.0.5"
+        },
+        "cached-property": {
+            "hashes": [
+                "sha256:9fa5755838eecbb2d234c3aa390bd80fbd3ac6b6869109bfc1b499f7bd89a130",
+                "sha256:df4f613cf7ad9a588cc381aaf4a512d26265ecebd5eb9e1ba12f1319eb85a6a0"
+            ],
+            "markers": "python_version < '3.8'",
+            "version": "==1.5.2"
+        },
+        "importlib-metadata": {
+            "hashes": [
+                "sha256:5d26852efe48c0a32b0509ffbc583fda1a2266545a78d104a6f4aff3db17d700",
+                "sha256:c58c8eb8a762858f49e18436ff552e83914778e50e9d2f1660535ffb364552ec"
+            ],
+            "markers": "python_version < '3.8'",
+            "version": "==4.11.4"
         },
         "pycryptodome": {
             "hashes": [
-                "sha256:09c1555a3fa450e7eaca41ea11cd00afe7c91fef52353488e65663777d8524e0",
-                "sha256:12222a5edc9ca4a29de15fbd5339099c4c26c56e13c2ceddf0b920794f26165d",
-                "sha256:1723ebee5561628ce96748501cdaa7afaa67329d753933296321f0be55358dce",
-                "sha256:1c5e1ca507de2ad93474be5cfe2bfa76b7cf039a1a32fc196f40935944871a06",
-                "sha256:2603c98ae04aac675fefcf71a6c87dc4bb74a75e9071ae3923bbc91a59f08d35",
-                "sha256:2dea65df54349cdfa43d6b2e8edb83f5f8d6861e5cf7b1fbc3e34c5694c85e27",
-                "sha256:31c1df17b3dc5f39600a4057d7db53ac372f492c955b9b75dd439f5d8b460129",
-                "sha256:38661348ecb71476037f1e1f553159b80d256c00f6c0b00502acac891f7116d9",
-                "sha256:3e2e3a06580c5f190df843cdb90ea28d61099cf4924334d5297a995de68e4673",
-                "sha256:3f840c49d38986f6e17dbc0673d37947c88bc9d2d9dba1c01b979b36f8447db1",
-                "sha256:501ab36aae360e31d0ec370cf5ce8ace6cb4112060d099b993bc02b36ac83fb6",
-                "sha256:60386d1d4cfaad299803b45a5bc2089696eaf6cdd56f9fc17479a6f89595cfc8",
-                "sha256:6260e24d41149268122dd39d4ebd5941e9d107f49463f7e071fd397e29923b0c",
-                "sha256:6bbf7fee7b7948b29d7e71fcacf48bac0c57fb41332007061a933f2d996f9713",
-                "sha256:6d2df5223b12437e644ce0a3be7809471ffa71de44ccd28b02180401982594a6",
-                "sha256:758949ca62690b1540dfb24ad773c6da9cd0e425189e83e39c038bbd52b8e438",
-                "sha256:77997519d8eb8a4adcd9a47b9cec18f9b323e296986528186c0e9a7a15d6a07e",
-                "sha256:7fd519b89585abf57bf47d90166903ec7b43af4fe23c92273ea09e6336af5c07",
-                "sha256:98213ac2b18dc1969a47bc65a79a8fca02a414249d0c8635abb081c7f38c91b6",
-                "sha256:99b2f3fc51d308286071d0953f92055504a6ffe829a832a9fc7a04318a7683dd",
-                "sha256:9b6f711b25e01931f1c61ce0115245a23cdc8b80bf8539ac0363bdcf27d649b6",
-                "sha256:a3105a0eb63eacf98c2ecb0eb4aa03f77f40fbac2bdde22020bb8a536b226bb8",
-                "sha256:a8eb8b6ea09ec1c2535bf39914377bc8abcab2c7d30fa9225eb4fe412024e427",
-                "sha256:a92d5c414e8ee1249e850789052608f582416e82422502dc0ac8c577808a9067",
-                "sha256:d3d6958d53ad307df5e8469cc44474a75393a434addf20ecd451f38a72fe29b8",
-                "sha256:e0a4d5933a88a2c98bbe19c0c722f5483dc628d7a38338ac2cb64a7dbd34064b",
-                "sha256:e3bf558c6aeb49afa9f0c06cee7fb5947ee5a1ff3bd794b653d39926b49077fa",
-                "sha256:e61e363d9a5d7916f3a4ce984a929514c0df3daf3b1b2eb5e6edbb131ee771cf",
-                "sha256:f977cdf725b20f6b8229b0c87acb98c7717e742ef9f46b113985303ae12a99da",
-                "sha256:fc7489a50323a0df02378bc2fff86eb69d94cc5639914346c736be981c6a02e7"
+                "sha256:028dcbf62d128b4335b61c9fbb7dd8c376594db607ef36d5721ee659719935d5",
+                "sha256:12ef157eb1e01a157ca43eda275fa68f8db0dd2792bc4fe00479ab8f0e6ae075",
+                "sha256:2562de213960693b6d657098505fd4493c45f3429304da67efcbeb61f0edfe89",
+                "sha256:27e92c1293afcb8d2639baf7eb43f4baada86e4de0f1fb22312bfc989b95dae2",
+                "sha256:36e3242c4792e54ed906c53f5d840712793dc68b726ec6baefd8d978c5282d30",
+                "sha256:50a5346af703330944bea503106cd50c9c2212174cfcb9939db4deb5305a8367",
+                "sha256:53dedbd2a6a0b02924718b520a723e88bcf22e37076191eb9b91b79934fb2192",
+                "sha256:69f05aaa90c99ac2f2af72d8d7f185f729721ad7c4be89e9e3d0ab101b0ee875",
+                "sha256:75a3a364fee153e77ed889c957f6f94ec6d234b82e7195b117180dcc9fc16f96",
+                "sha256:766a8e9832128c70012e0c2b263049506cbf334fb21ff7224e2704102b6ef59e",
+                "sha256:7fb90a5000cc9c9ff34b4d99f7f039e9c3477700e309ff234eafca7b7471afc0",
+                "sha256:893f32210de74b9f8ac869ed66c97d04e7d351182d6d39ebd3b36d3db8bda65d",
+                "sha256:8b5c28058102e2974b9868d72ae5144128485d466ba8739abd674b77971454cc",
+                "sha256:924b6aad5386fb54f2645f22658cb0398b1f25bc1e714a6d1522c75d527deaa5",
+                "sha256:9924248d6920b59c260adcae3ee231cd5af404ac706ad30aa4cd87051bf09c50",
+                "sha256:9ec761a35dbac4a99dcbc5cd557e6e57432ddf3e17af8c3c86b44af9da0189c0",
+                "sha256:a36ab51674b014ba03da7f98b675fcb8eabd709a2d8e18219f784aba2db73b72",
+                "sha256:aae395f79fa549fb1f6e3dc85cf277f0351e15a22e6547250056c7f0c990d6a5",
+                "sha256:c880a98376939165b7dc504559f60abe234b99e294523a273847f9e7756f4132",
+                "sha256:ce7a875694cd6ccd8682017a7c06c6483600f151d8916f2b25cf7a439e600263",
+                "sha256:d1b7739b68a032ad14c5e51f7e4e1a5f92f3628bba024a2bda1f30c481fc85d8",
+                "sha256:dcd65355acba9a1d0fc9b923875da35ed50506e339b35436277703d7ace3e222",
+                "sha256:e04e40a7f8c1669195536a37979dd87da2c32dbdc73d6fe35f0077b0c17c803b",
+                "sha256:e0c04c41e9ade19fbc0eff6aacea40b831bfcb2c91c266137bcdfd0d7b2f33ba",
+                "sha256:e24d4ec4b029611359566c52f31af45c5aecde7ef90bf8f31620fd44c438efe7",
+                "sha256:e64738207a02a83590df35f59d708bf1e7ea0d6adce712a777be2967e5f7043c",
+                "sha256:ea56a35fd0d13121417d39a83f291017551fa2c62d6daa6b04af6ece7ed30d84",
+                "sha256:f2772af1c3ef8025c85335f8b828d0193fa1e43256621f613280e2c81bfad423",
+                "sha256:f403a3e297a59d94121cb3ee4b1cf41f844332940a62d71f9e4a009cc3533493",
+                "sha256:f572a3ff7b6029dd9b904d6be4e0ce9e309dcb847b03e3ac8698d9d23bb36525"
             ],
-            "version": "==3.10.1"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==3.14.1"
         },
         "semantic-version": {
             "hashes": [
                 "sha256:45e4b32ee9d6d70ba5f440ec8cc5221074c7f4b0e8918bdab748cc37912440a9",
                 "sha256:d2cb2de0558762934679b9a104e82eca7af448c9f4974d1f3eeccff651df8a54"
             ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==2.8.5"
         },
         "six": {
@@ -70,15 +88,40 @@
                 "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
                 "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
             ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==1.16.0"
         },
+        "typing-extensions": {
+            "hashes": [
+                "sha256:6657594ee297170d19f67d55c05852a874e7eb634f4f753dbd667855e07c1708",
+                "sha256:f1c24655a0da0d1b67f07e17a5e6b2a105894e6824b92096378bb3668ef02376"
+            ],
+            "markers": "python_version < '3.8'",
+            "version": "==4.2.0"
+        },
         "vyper": {
             "hashes": [
-                "sha256:c97dd2d2c9ed5185338c8d9c78ad00432873fbe3387db62ecf7e33bf4e33882a",
-                "sha256:caad7d03a1e69b80d6cd6711d1fb810df91d13e2cbced52a606a0bbb476af31e"
+                "sha256:0409cd8f6ec1d4701bf5554303af5b1466d08de3a9974839101da3b9a8ea040c",
+                "sha256:436dbc49e3bf08d3f36e331384fcdbffec3341d7561fe05960969508686257e6"
             ],
             "index": "pypi",
-            "version": "==0.2.12"
+            "version": "==0.3.3"
+        },
+        "wheel": {
+            "hashes": [
+                "sha256:4bdcd7d840138086126cd09254dc6195fb4fc6f01c050a1d7236f2630db1d22a",
+                "sha256:e9a504e793efbca1b8e0e9cb979a249cf4a0a7b5b8c9e8b65a5e39d49529c1c4"
+            ],
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==0.37.1"
+        },
+        "zipp": {
+            "hashes": [
+                "sha256:56bf8aadb83c24db6c4b577e13de374ccfb67da2078beba1d037c17980bf43ad",
+                "sha256:c4f6e5bbf48e74f7a38e7cc5b0480ff42b0ae5178957d564d18932525d5cf099"
+            ],
+            "markers": "python_version >= '3.7'",
+            "version": "==3.8.0"
         }
     },
     "develop": {}