diff --git a/jestconfig.json b/jestconfig.json
index e1bb70c..f41c403 100644
--- a/jestconfig.json
+++ b/jestconfig.json
@@ -2,6 +2,6 @@
   "transform": {
     "^.+\\.(t|j)sx?$": "ts-jest"
   },
-  "testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$",
+  "testRegex": "./__tests__/Anchor.test.ts",
   "moduleFileExtensions": ["ts", "tsx", "js", "jsx", "json", "node"]
 }
\ No newline at end of file
diff --git a/src/__tests__/Anchor.test.ts b/src/__tests__/Anchor.test.ts
index 29c2b57..e7ece07 100644
--- a/src/__tests__/Anchor.test.ts
+++ b/src/__tests__/Anchor.test.ts
@@ -32,14 +32,18 @@ test('Anchor', (done) => {
       expect(decoded?.data).toStrictEqual({})
     })
   pythOracle.methods
-    .updProduct()
+    .updProduct({ asset_type: 'Crypto', base: 'BTC', description : "BTC/USD", quote_currency :"USD", symbol : "Crypto.BTC/USD", generic_symbol : "BTCUSD"  })
     .accounts({ fundingAccount: PublicKey.unique(), productAccount: PublicKey.unique() })
     .instruction()
     .then((instruction) => {
-      expect(instruction.data).toStrictEqual(Buffer.from([2, 0, 0, 0, 3, 0, 0, 0]))
       const decoded = pythOracleCoder().instruction.decode(instruction.data)
       expect(decoded?.name).toBe('updProduct')
-      expect(decoded?.data).toStrictEqual({})
+      expect(decoded?.data.asset_type).toBe("Crypto")
+      expect(decoded?.data.base).toBe("BTC")
+      expect(decoded?.data.description).toBe("BTC/USD")
+      expect(decoded?.data.quote_currency).toBe("USD")
+      expect(decoded?.data.symbol).toBe("Crypto.BTC/USD")
+      expect(decoded?.data.generic_symbol).toBe("BTCUSD")
     })
 
   pythOracle.methods
diff --git a/src/anchor/coder/instructions.ts b/src/anchor/coder/instructions.ts
index 263a40b..aaa4f8c 100644
--- a/src/anchor/coder/instructions.ts
+++ b/src/anchor/coder/instructions.ts
@@ -11,6 +11,7 @@ import { PublicKey } from '@solana/web3.js'
 import { Idl, IdlField, IdlType, IdlAccountItem } from '@coral-xyz/anchor/dist/cjs/idl'
 import { IdlCoder } from './idl'
 import { InstructionCoder } from '@coral-xyz/anchor'
+import { Product } from '../..'
 
 export type PythIdlInstruction = {
   name: string
@@ -79,14 +80,32 @@ export class PythOracleInstructionCoder implements InstructionCoder {
   public encode(ixName: string, ix: any): Buffer {
     const buffer = Buffer.alloc(1000) // TODO: use a tighter buffer.
     const methodName = camelCase(ixName)
+
     const layout = this.ixLayout.get(methodName)
     const discriminator = this.ixDiscriminator.get(methodName)
     if (!layout || !discriminator) {
       throw new Error(`Unknown method: ${methodName}`)
     }
-    const len = layout.encode(ix, buffer)
-    const data = buffer.subarray(0, len)
-    return Buffer.concat([discriminator, data])
+
+    /// updProduct has its own format
+    if (methodName === 'updProduct') {
+      let offset = 0
+      for (const key of Object.keys(ix.productMetadata)) {
+        offset += buffer.subarray(offset).writeInt8(key.length)
+        offset += buffer.subarray(offset).write(key)
+        offset += buffer.subarray(offset).writeInt8(ix.productMetadata[key].length)
+        offset += buffer.subarray(offset).write(ix.productMetadata[key])
+      }
+      if (offset > 464) {
+        throw new Error('The metadata is too long')
+      }
+      const data = buffer.subarray(0, offset)
+      return Buffer.concat([discriminator, data])
+    } else {
+      const len = layout.encode(ix, buffer)
+      const data = buffer.subarray(0, len)
+      return Buffer.concat([discriminator, data])
+    }
   }
 
   private static parseIxLayout(idl: Idl): Map<string, Layout> {
@@ -114,9 +133,33 @@ export class PythOracleInstructionCoder implements InstructionCoder {
     if (!decoder) {
       return null
     }
-    return {
-      data: decoder.layout.decode(data),
-      name: decoder.name,
+
+    /// updProduct has its own format
+    if (decoder.name === 'updProduct') {
+      const product: Product = {}
+      let idx = 0
+      while (idx < data.length) {
+        const keyLength = data[idx]
+        idx++
+        if (keyLength) {
+          const key = data.slice(idx, idx + keyLength).toString()
+          idx += keyLength
+          const valueLength = data[idx]
+          idx++
+          const value = data.slice(idx, idx + valueLength).toString()
+          idx += valueLength
+          product[key] = value
+        }
+      }
+      return {
+        data: product,
+        name: decoder.name,
+      }
+    } else {
+      return {
+        data: decoder.layout.decode(data),
+        name: decoder.name,
+      }
     }
   }
 }
diff --git a/src/anchor/idl.json b/src/anchor/idl.json
index 21c33b6..27ecb66 100644
--- a/src/anchor/idl.json
+++ b/src/anchor/idl.json
@@ -134,7 +134,14 @@
           }
         }
       ],
-      "args": []
+      "args": [
+        {
+          "name": "productMetadata",
+          "type": {
+            "defined": "ProductMetadata"
+          }
+        }
+      ]
     },
     {
       "name": "addPrice",
@@ -585,5 +592,14 @@
         }
       ]
     }
+  ],
+  "types": [
+    {
+      "name": "ProductMetadata",
+      "type": {
+        "kind": "struct",
+        "fields": []
+      }
+    }
   ]
 }
diff --git a/src/anchor/program.ts b/src/anchor/program.ts
index b1bd860..7032376 100644
--- a/src/anchor/program.ts
+++ b/src/anchor/program.ts
@@ -154,7 +154,14 @@ export type PythOracle = {
           }
         },
       ]
-      args: []
+      args: [
+        {
+          name: 'productMetadata'
+          type: {
+            defined: 'ProductMetadata'
+          }
+        },
+      ]
     },
     {
       name: 'addPrice'
@@ -606,4 +613,13 @@ export type PythOracle = {
       ]
     },
   ]
+  types: [
+    {
+      name: 'ProductMetadata'
+      type: {
+        kind: 'struct'
+        fields: []
+      }
+    },
+  ]
 }