diff --git a/src/modules/quotes/quotes.service.ts b/src/modules/quotes/quotes.service.ts
index 715de9c4..2632bef1 100644
--- a/src/modules/quotes/quotes.service.ts
+++ b/src/modules/quotes/quotes.service.ts
@@ -122,7 +122,7 @@ export class QuotesService {
     } = options;
 
     const isEIP712SupportedMeeVersion = this.isVersionConsistentAndAboveTarget(
-      "2.2.0",
+      "2.2.1",
       meeVersions,
     );
 
@@ -677,7 +677,7 @@ export class QuotesService {
     } = options;
 
     const isEIP712SupportedMeeVersion = this.isVersionConsistentAndAboveTarget(
-      "2.2.0",
+      "2.2.1",
       meeVersions,
     );
     const isStxValidatorSupportedMeeVersion =
@@ -894,32 +894,18 @@ export class QuotesService {
           case "simple": {
             if (isSessionExists) {
               if (isEIP712SupportedMeeVersion) {
-                signature = concatHex([
-                  signatureType, // Simple signature type
-                  encodeAbiParameters(
-                    [
-                      { type: "bytes32" }, // stxStructTypeHash
-                      { type: "uint256" }, // userOp index
-                      { type: "bytes32[]" }, // meeUserOpHashes - array of hashes
-                      { type: "bytes" }, // superTxSignature
-                    ],
-                    [
-                      SUPERTX_MEEUSEROP_STRUCT_TYPEHASH,
-                      // For trusted sponsorship, as we're ignoring the payment userOp, index should be sub by 1 to account for that
-                      // The index will be always greater than 1 if its sponsorship mode so sub by 1 is not a problem
-                      isEIP712TrustedSponsorshipSupported &&
-                      isTrustedSponsorship
-                        ? BigInt(index - 1)
-                        : BigInt(index),
-                      // If it is a trusted sponsorship, the payment userop can be skipped because it is not going to be executed at all.
-                      isEIP712TrustedSponsorshipSupported &&
-                      isTrustedSponsorship
-                        ? meeUserOpHashes.slice(1)
-                        : meeUserOpHashes,
-                      signatureData,
-                    ],
-                  ),
-                ]);
+                // Smart sessions with MEE >= 2.2.1: use raw ECDSA signature (no MEE prefix).
+                // This routes through NoMeeFlowLib.validateSignatureForOwner on-chain,
+                // which does plain ECDSA recovery against the raw userOpHash.
+                //
+                // We cannot use the MEE simple mode (0x177eee00) because:
+                // - SmartSession calls K1MeeValidator.validateSignatureWithData externally
+                // - compareAndGetFinalHash calls hashTypedDataForAccount(msg.sender, ...)
+                // - msg.sender is SmartSession's address, not the account
+                // - SmartSession doesn't implement eip712Domain() → reverts
+                //
+                // Session expiry is handled by SmartSession's own policies.
+                signature = signatureData;
               } else {
                 signature = concatHex([
                   signatureType,
diff --git a/src/modules/quotes/schemas.ts b/src/modules/quotes/schemas.ts
index bacc8d0e..23adc690 100644
--- a/src/modules/quotes/schemas.ts
+++ b/src/modules/quotes/schemas.ts
@@ -23,7 +23,6 @@ export const meeVersionSchema = z.enum([
   "3.0.0",
   "2.3.0",
   "2.2.1",
-  "2.2.0",
   "2.1.0",
   "2.0.0",
   "1.1.0",
diff --git a/src/modules/simulator/simulation.service.ts b/src/modules/simulator/simulation.service.ts
index 95dd44f7..6827670e 100644
--- a/src/modules/simulator/simulation.service.ts
+++ b/src/modules/simulator/simulation.service.ts
@@ -121,24 +121,9 @@ export class SimulationService {
       "0xcae0d1955b99d4832aef73ed0a2237045fad91a738ee5b96ba76b9a12ffc6f824ab2ecaeeeb903b50704fdf4a5d64216adf7d6aaaca0ed2a67b86d8525c4b4bb1c" as Hex;
 
     if (sessionInfo?.sessionDetails) {
-      const dummySignature = concatHex([
-        "0x177eee00", // Simple signature type
-        encodeAbiParameters(
-          [
-            { type: "bytes32" }, // stxStructTypeHash
-            { type: "uint256" }, // userOp index
-            { type: "bytes32[]" }, // meeUserOpHashes - array of hashes
-            { type: "bytes" }, // superTxSignature
-          ],
-          [
-            SUPERTX_MEEUSEROP_STRUCT_TYPEHASH,
-            BigInt(index),
-            // If it is a trusted sponsorship, the payment userop can be skipped because it is not going to be executed at all.
-            isTrustedSponsorship ? meeUserOpHashes.slice(1) : meeUserOpHashes,
-            dummyStxSig,
-          ],
-        ),
-      ]);
+      // Smart sessions with MEE >= 2.2.1: use raw ECDSA signature (no MEE prefix).
+      // Routes through NoMeeFlowLib.validateSignatureForOwner on-chain.
+      const dummySignature = dummyStxSig;
 
       const dummySessionDetails: GrantPermissionResponseType = {
         ...sessionInfo?.sessionDetails,
@@ -635,7 +620,7 @@ export class SimulationService {
         let meeVersion: MeeVersionsType = "2.0.0";
 
         // From this version, the EIP712 signatures are being supported and the dummy signature needs to be different here
-        const eip712SignatureVersionTarget: MeeVersionsType = "2.2.0";
+        const eip712SignatureVersionTarget: MeeVersionsType = "2.2.1";
 
         if (meeVersionInfo) {
           meeVersion = meeVersionInfo.version.version;
diff --git a/src/modules/user-ops/userop.service.ts b/src/modules/user-ops/userop.service.ts
index 97d0bfca..3a7a1e52 100644
--- a/src/modules/user-ops/userop.service.ts
+++ b/src/modules/user-ops/userop.service.ts
@@ -458,14 +458,14 @@ export class UserOpService {
     let meeUserOpHash: Hex;
 
     if (isEIP712SupportedMeeVersion && isSimpleMode) {
-      // If the meeVersion >= 2.2.0, V2 meeUserOp hash will be generated for simple mode
+      // If the meeVersion >= 2.2.1, V2 meeUserOp hash will be generated for simple mode
       meeUserOpHash = getMeeUserOpHashEip712(
         userOpHash,
         lowerBoundTimestamp,
         upperBoundTimestamp,
       );
     } else {
-      // If the meeVersion is less than 2.2.0, legacy meeUserOp hash will be generated
+      // If the meeVersion is less than 2.2.1, legacy meeUserOp hash will be generated
       meeUserOpHash = getMeeUserOpHash(
         userOpHash,
         lowerBoundTimestamp,