diff --git a/ethash/res/progpow_testvectors.json b/ethash/res/progpow_testvectors.json
index 2939f7106..6fe7a6f8b 100644
--- a/ethash/res/progpow_testvectors.json
+++ b/ethash/res/progpow_testvectors.json
@@ -3,84 +3,84 @@
     0,
     "0000000000000000000000000000000000000000000000000000000000000000",
     "0000000000000000",
-    "faeb1be51075b03a4ff44b335067951ead07a3b078539ace76fd56fc410557a3",
-    "63155f732f2bf556967f906155b510c917e48e99685ead76ea83f4eca03ab12b"
+    "f4ac202715ded4136e72887c39e63a4738331c57fd9eb79f6ec421c281aa8743",
+    "b3bad9ca6f7c566cf0377d1f8cce29d6516a96562c122d924626281ec948ef02"
   ],
   [
     49,
-    "63155f732f2bf556967f906155b510c917e48e99685ead76ea83f4eca03ab12b",
+    "b3bad9ca6f7c566cf0377d1f8cce29d6516a96562c122d924626281ec948ef02",
     "0000000006ff2c47",
-    "c789c1180f890ec555ff42042913465481e8e6bc512cb981e1c1108dc3f2227d",
-    "9e7248f20914913a73d80a70174c331b1d34f260535ac3631d770e656b5dd922"
+    "7730596f128f675ef9a6bb7281f268e4077d302f2b9078da1ece4349248561dd",
+    "0b9ed0c11157f1365143e329a6e1cea4248d9d6cb44b9c6daf492c7a076654a4"
   ],
   [
     50,
-    "9e7248f20914913a73d80a70174c331b1d34f260535ac3631d770e656b5dd922",
+    "0b9ed0c11157f1365143e329a6e1cea4248d9d6cb44b9c6daf492c7a076654a4",
     "00000000076e482e",
-    "c7340542c2a06b3a7dc7222635f7cd402abf8b528ae971ddac6bbe2b0c7cb518",
-    "de37e1824c86d35d154cf65a88de6d9286aec4f7f10c3fc9f0fa1bcc2687188d"
+    "829136d4a704eb8d06da773f1a90466e7b5ed12119c44526f045bbff4475d891",
+    "e2e881c5b893c2f1ef06b96a10cfcbcf7255b307f0818e7d30eb12b2edfc237b"
   ],
   [
     99,
-    "de37e1824c86d35d154cf65a88de6d9286aec4f7f10c3fc9f0fa1bcc2687188d",
+    "e2e881c5b893c2f1ef06b96a10cfcbcf7255b307f0818e7d30eb12b2edfc237b",
     "000000003917afab",
-    "f5e60b2c5bfddd136167a30cbc3c8dbdbd15a512257dee7964e0bc6daa9f8ba7",
-    "ac7b55e801511b77e11d52e9599206101550144525b5679f2dab19386f23dcce"
+    "deb3d8b45bdc596c56aa37a5eba456f478c82e60e5c028ce95f2e654e4bb7b57",
+    "9bdc2ad2286eaa051d6ca1f5196d2dd1c9a039f1d7ce3e1c856b793deed01778"
   ],
   [
     29950,
-    "ac7b55e801511b77e11d52e9599206101550144525b5679f2dab19386f23dcce",
+    "9bdc2ad2286eaa051d6ca1f5196d2dd1c9a039f1d7ce3e1c856b793deed01778",
     "005d409dbc23a62a",
-    "07393d15805eb08ee6fc6cb3ad4ad1010533bd0ff92d6006850246829f18fd6e",
-    "e43d7e0bdc8a4a3f6e291a5ed790b9fa1a0948a2b9e33c844888690847de19f5"
+    "c01e6d339cc687c77f653b81c74cb9de8b595554f2c5db671a7dde3846d2fa01",
+    "de0d693e597cf2fd70a4cfaa73f6baafc29e1eee695a81295b278c1116580b72"
   ],
   [
     29999,
-    "e43d7e0bdc8a4a3f6e291a5ed790b9fa1a0948a2b9e33c844888690847de19f5",
+    "de0d693e597cf2fd70a4cfaa73f6baafc29e1eee695a81295b278c1116580b72",
     "005db5fa4c2a3d03",
-    "7551bddf977491da2f6cfc1679299544b23483e8f8ee0931c4c16a796558a0b8",
-    "d34519f72c97cae8892c277776259db3320820cb5279a299d0ef1e155e5c6454"
+    "8b664cdbf396a7a185446c93dddd6611f5a736b11097381ae6bea45e802cec16",
+    "21ec5d1984a4fd4394b042aa96365085225d964727a45def245ceab326e28128"
   ],
   [
     30000,
-    "d34519f72c97cae8892c277776259db3320820cb5279a299d0ef1e155e5c6454",
+    "21ec5d1984a4fd4394b042aa96365085225d964727a45def245ceab326e28128",
     "005db8607994ff30",
-    "f1c2c7c32266af9635462e6ce1c98ebe4e7e3ecab7a38aaabfbf2e731e0fbff4",
-    "8b6ce5da0b06d18db7bd8492d9e5717f8b53e7e098d9fef7886d58a6e913ef64"
+    "276951d89c1ed262bcac00df4fb9bf7af36991532744a2e287b0b758a56e15aa",
+    "dc070b76cc311cd82267f98936acbbbd3ec1c1ab25b55e2c885af6474e1e6841"
   ],
   [
     30049,
-    "8b6ce5da0b06d18db7bd8492d9e5717f8b53e7e098d9fef7886d58a6e913ef64",
+    "dc070b76cc311cd82267f98936acbbbd3ec1c1ab25b55e2c885af6474e1e6841",
     "005e2e215a8ca2e7",
-    "57fe6a9fbf920b4e91deeb66cb0efa971e08229d1a160330e08da54af0689add",
-    "c2c46173481b9ced61123d2e293b42ede5a1b323210eb2a684df0874ffe09047"
+    "6248ba0157d0f0592dacfe2963337948fffb37f67e7451a6862c1321d894cebe",
+    "6fdecf719e2547f585a6ee807d8237db8e9489f63d3f259ab5236451eaded433"
   ],
   [
     30050,
-    "c2c46173481b9ced61123d2e293b42ede5a1b323210eb2a684df0874ffe09047",
+    "6fdecf719e2547f585a6ee807d8237db8e9489f63d3f259ab5236451eaded433",
     "005e30899481055e",
-    "ba30c61cc5a2c74a5ecaf505965140a08f24a296d687e78720f0b48baf712f2d",
-    "ea42197eb2ba79c63cb5e655b8b1f612c5f08aae1a49ff236795a3516d87bc71"
+    "512d8f2bb0441fcfa1764c67e8dbed2afcbe9141de4bbebc5b51e0661dede550",
+    "cb1587a1c372642cbd9ce4c1ba2f433985d44c571a676a032bc1e8c1ad066e24"
   ],
   [
     30099,
-    "ea42197eb2ba79c63cb5e655b8b1f612c5f08aae1a49ff236795a3516d87bc71",
+    "cb1587a1c372642cbd9ce4c1ba2f433985d44c571a676a032bc1e8c1ad066e24",
     "005ea6aef136f88b",
-    "cfd5e46048cd133d40f261fe8704e51d3f497fc14203ac6a9ef6a0841780b1cd",
-    "49e15ba4bf501ce8fe8876101c808e24c69a859be15de554bf85dbc095491bd6"
+    "be0e7d6afa6edd483ccc304afa9bf0abaca5e0f037a4f05bf5550b9309d1d12c",
+    "78be18f20569a834d839dad48e0e51d6df6b6537575f0ad29898c7cf357f12cb"
   ],
   [
     59950,
-    "49e15ba4bf501ce8fe8876101c808e24c69a859be15de554bf85dbc095491bd6",
+    "78be18f20569a834d839dad48e0e51d6df6b6537575f0ad29898c7cf357f12cb",
     "02ebe0503bd7b1da",
-    "21511fbaa31fb9f5fc4998a754e97b3083a866f4de86fa7500a633346f56d773",
-    "f5c50ba5c0d6210ddb16250ec3efda178de857b2b1703d8d5403bd0f848e19cf"
+    "b85be51fce670aa437f28c02ea4fd7995fa8b6ac224e959b8dbfb5bdbc6f77ce",
+    "a68a620ba17e0cf2817bc4397cf4b85f5770983aa7b7931319a7f61bd6f905b1"
   ],
   [
     59999,
-    "f5c50ba5c0d6210ddb16250ec3efda178de857b2b1703d8d5403bd0f848e19cf",
+    "a68a620ba17e0cf2817bc4397cf4b85f5770983aa7b7931319a7f61bd6f905b1",
     "02edb6275bd221e3",
-    "653eda37d337e39d311d22be9bbd3458d3abee4e643bee4a7280a6d08106ef98",
-    "341562d10d4afb706ec2c8d5537cb0c810de02b4ebb0a0eea5ae335af6fb2e88"
+    "ffe745a932c21c0704291bb416fe8bffec76621cd3434861885beab42cec1734",
+    "9e6667a151ac6f5186a05cb20877a2b3df02317046256a762cb8ec2d96aa34f0"
   ]
 ]
diff --git a/ethash/src/progpow.rs b/ethash/src/progpow.rs
index 547bd03ce..4c18c255a 100644
--- a/ethash/src/progpow.rs
+++ b/ethash/src/progpow.rs
@@ -29,6 +29,9 @@
 //!
 //! ProgPoW audits have been proposed to analyse the efficiency of a ProgPoW ASICs over
 //! GPUs and analysis of the economic impact on the Ethereum protocol.
+//!
+//! We use ProgPoW 0.9.3 version as suggested on Specification
+//! https://github.com/ethereum/EIPs/blob/master/EIPS/eip-1057.md#specification
 
 use compute::{FNV_PRIME, calculate_dag_item};
 use keccak::H256;
@@ -36,12 +39,12 @@ use shared::{ETHASH_ACCESSES, ETHASH_MIX_BYTES, Node, get_data_size};
 
 const PROGPOW_CACHE_BYTES: usize = 16 * 1024;
 const PROGPOW_CACHE_WORDS: usize = PROGPOW_CACHE_BYTES / 4;
-const PROGPOW_CNT_CACHE: usize = 12;
-const PROGPOW_CNT_MATH: usize = 20;
+const PROGPOW_CNT_CACHE: usize = 11;
+const PROGPOW_CNT_MATH: usize = 18;
 const PROGPOW_CNT_DAG: usize = ETHASH_ACCESSES;
 const PROGPOW_DAG_LOADS: usize = 4;
 const PROGPOW_MIX_BYTES: usize = 2 * ETHASH_MIX_BYTES;
-const PROGPOW_PERIOD_LENGTH: usize = 50; // blocks per progpow epoch (N)
+const PROGPOW_PERIOD_LENGTH: usize = 10; // blocks per progpow epoch (N)
 const PROGPOW_LANES: usize = 16;
 const PROGPOW_REGS: usize = 32;
 
@@ -546,8 +549,8 @@ mod test {
 			&c_dag,
 		);
 
-		let expected_digest = FromHex::from_hex("63155f732f2bf556967f906155b510c917e48e99685ead76ea83f4eca03ab12b").unwrap();
-		let expected_result = FromHex::from_hex("faeb1be51075b03a4ff44b335067951ead07a3b078539ace76fd56fc410557a3").unwrap();
+		let expected_digest = FromHex::from_hex("b3bad9ca6f7c566cf0377d1f8cce29d6516a96562c122d924626281ec948ef02").unwrap();
+		let expected_result = FromHex::from_hex("f4ac202715ded4136e72887c39e63a4738331c57fd9eb79f6ec421c281aa8743").unwrap();
 
 		assert_eq!(
 			digest.to_vec(),