diff --git a/src/account/ReferenceModularAccount.sol b/src/account/ReferenceModularAccount.sol
index 84459949..cefc1d46 100644
--- a/src/account/ReferenceModularAccount.sol
+++ b/src/account/ReferenceModularAccount.sol
@@ -281,7 +281,7 @@ contract ReferenceModularAccount is
 
     /// @inheritdoc IModularAccount
     function accountId() external pure virtual returns (string memory) {
-        return "erc6900/reference-modular-account/0.8.0";
+        return "erc6900.reference-modular-account.0.8.0";
     }
 
     /// @inheritdoc UUPSUpgradeable
diff --git a/src/account/SemiModularAccount.sol b/src/account/SemiModularAccount.sol
index 8bde2316..906349fa 100644
--- a/src/account/SemiModularAccount.sol
+++ b/src/account/SemiModularAccount.sol
@@ -93,7 +93,7 @@ contract SemiModularAccount is ReferenceModularAccount {
 
     /// @inheritdoc IModularAccount
     function accountId() external pure override returns (string memory) {
-        return "erc6900/reference-semi-modular-account/0.8.0";
+        return "erc6900.reference-semi-modular-account.0.8.0";
     }
 
     function replaySafeHash(bytes32 hash) public view virtual returns (bytes32) {
diff --git a/src/interfaces/IModularAccount.sol b/src/interfaces/IModularAccount.sol
index dcad3ee8..8ddebb75 100644
--- a/src/interfaces/IModularAccount.sol
+++ b/src/interfaces/IModularAccount.sol
@@ -99,7 +99,8 @@ interface IModularAccount {
     ) external;
 
     /// @notice Return a unique identifier for the account implementation.
-    /// @dev This function MUST return a string in the format "vendor/account/semver".
+    /// @dev This function MUST return a string in the format "vendor.account.semver". The vendor and account
+    /// names MUST NOT contain a period character.
     /// @return The account ID.
     function accountId() external view returns (string memory);
 }
diff --git a/src/interfaces/IModule.sol b/src/interfaces/IModule.sol
index df070f6f..523e7265 100644
--- a/src/interfaces/IModule.sol
+++ b/src/interfaces/IModule.sol
@@ -17,7 +17,8 @@ interface IModule is IERC165 {
     function onUninstall(bytes calldata data) external;
 
     /// @notice Return a unique identifier for the module.
-    /// @dev This function MUST return a string in the format "vendor/module/semver".
+    /// @dev This function MUST return a string in the format "vendor.module.semver". The vendor and module
+    /// names MUST NOT contain a period character.
     /// @return The module ID.
     function moduleId() external view returns (string memory);
 }
diff --git a/src/modules/ERC20TokenLimitModule.sol b/src/modules/ERC20TokenLimitModule.sol
index c72bace3..eda85d15 100644
--- a/src/modules/ERC20TokenLimitModule.sol
+++ b/src/modules/ERC20TokenLimitModule.sol
@@ -115,7 +115,7 @@ contract ERC20TokenLimitModule is BaseModule, IExecutionHookModule {
 
     /// @inheritdoc IModule
     function moduleId() external pure returns (string memory) {
-        return "erc6900/erc20-token-limit-module/1.0.0";
+        return "erc6900.erc20-token-limit-module.1.0.0";
     }
 
     /// @inheritdoc BaseModule
diff --git a/src/modules/NativeTokenLimitModule.sol b/src/modules/NativeTokenLimitModule.sol
index 4d0a076b..b9244145 100644
--- a/src/modules/NativeTokenLimitModule.sol
+++ b/src/modules/NativeTokenLimitModule.sol
@@ -116,7 +116,7 @@ contract NativeTokenLimitModule is BaseModule, IExecutionHookModule, IValidation
 
     /// @inheritdoc IModule
     function moduleId() external pure returns (string memory) {
-        return "erc6900/native-token-limit-module/1.0.0";
+        return "erc6900.native-token-limit-module.1.0.0";
     }
 
     // ┏━━━━━━━━━━━━━━━┓
diff --git a/src/modules/TokenReceiverModule.sol b/src/modules/TokenReceiverModule.sol
index 51f06fcb..df02cd1f 100644
--- a/src/modules/TokenReceiverModule.sol
+++ b/src/modules/TokenReceiverModule.sol
@@ -82,6 +82,6 @@ contract TokenReceiverModule is BaseModule, IExecutionModule, IERC721Receiver, I
 
     /// @inheritdoc IModule
     function moduleId() external pure returns (string memory) {
-        return "erc6900/token-receiver-module/1.0.0";
+        return "erc6900.token-receiver-module.1.0.0";
     }
 }
diff --git a/src/modules/permissionhooks/AllowlistModule.sol b/src/modules/permissionhooks/AllowlistModule.sol
index 4d82bcf6..6b693244 100644
--- a/src/modules/permissionhooks/AllowlistModule.sol
+++ b/src/modules/permissionhooks/AllowlistModule.sol
@@ -91,7 +91,7 @@ contract AllowlistModule is IValidationHookModule, BaseModule {
 
     /// @inheritdoc IModule
     function moduleId() external pure returns (string memory) {
-        return "erc6900/allowlist-module/0.0.1";
+        return "erc6900.allowlist-module.0.0.1";
     }
 
     function setAllowlistTarget(uint32 entityId, address target, bool allowed, bool hasSelectorAllowlist) public {
diff --git a/src/modules/validation/SingleSignerValidationModule.sol b/src/modules/validation/SingleSignerValidationModule.sol
index 2dd0b28d..a750f4d6 100644
--- a/src/modules/validation/SingleSignerValidationModule.sol
+++ b/src/modules/validation/SingleSignerValidationModule.sol
@@ -114,7 +114,7 @@ contract SingleSignerValidationModule is ISingleSignerValidationModule, ReplaySa
 
     /// @inheritdoc IModule
     function moduleId() external pure returns (string memory) {
-        return "erc6900/single-signer-validation-module/1.0.0";
+        return "erc6900.single-signer-validation-module.1.0.0";
     }
 
     function supportsInterface(bytes4 interfaceId)
diff --git a/test/account/ReferenceModularAccount.t.sol b/test/account/ReferenceModularAccount.t.sol
index 5ffa8fa7..85b06c93 100644
--- a/test/account/ReferenceModularAccount.t.sol
+++ b/test/account/ReferenceModularAccount.t.sol
@@ -189,8 +189,8 @@ contract ReferenceModularAccountTest is AccountTestBase {
         assertEq(
             accountId,
             vm.envOr("SMA_TEST", false)
-                ? "erc6900/reference-semi-modular-account/0.8.0"
-                : "erc6900/reference-modular-account/0.8.0"
+                ? "erc6900.reference-semi-modular-account.0.8.0"
+                : "erc6900.reference-modular-account.0.8.0"
         );
     }
 
diff --git a/test/mocks/MockModule.sol b/test/mocks/MockModule.sol
index 354373e1..260c515c 100644
--- a/test/mocks/MockModule.sol
+++ b/test/mocks/MockModule.sol
@@ -48,7 +48,7 @@ contract MockModule is ERC165 {
     }
 
     function moduleId() external pure returns (string memory) {
-        return "erc6900/mock-module/1.0.0";
+        return "erc6900.mock-module.1.0.0";
     }
 
     /// @dev Returns true if this contract implements the interface defined by
diff --git a/test/mocks/modules/ComprehensiveModule.sol b/test/mocks/modules/ComprehensiveModule.sol
index 623c4cf9..cfaead0e 100644
--- a/test/mocks/modules/ComprehensiveModule.sol
+++ b/test/mocks/modules/ComprehensiveModule.sol
@@ -175,6 +175,6 @@ contract ComprehensiveModule is
     }
 
     function moduleId() external pure returns (string memory) {
-        return "erc6900/comprehensive-module/1.0.0";
+        return "erc6900.comprehensive-module.1.0.0";
     }
 }
diff --git a/test/mocks/modules/DirectCallModule.sol b/test/mocks/modules/DirectCallModule.sol
index 35adde84..c81c9a18 100644
--- a/test/mocks/modules/DirectCallModule.sol
+++ b/test/mocks/modules/DirectCallModule.sol
@@ -24,7 +24,7 @@ contract DirectCallModule is BaseModule, IExecutionHookModule {
     }
 
     function moduleId() external pure returns (string memory) {
-        return "erc6900/direct-call-module/1.0.0";
+        return "erc6900.direct-call-module.1.0.0";
     }
 
     function preExecutionHook(uint32, address sender, uint256, bytes calldata)
diff --git a/test/mocks/modules/MockAccessControlHookModule.sol b/test/mocks/modules/MockAccessControlHookModule.sol
index 74a92b10..bad9fcb4 100644
--- a/test/mocks/modules/MockAccessControlHookModule.sol
+++ b/test/mocks/modules/MockAccessControlHookModule.sol
@@ -79,7 +79,7 @@ contract MockAccessControlHookModule is IValidationHookModule, BaseModule {
     }
 
     function moduleId() external pure returns (string memory) {
-        return "erc6900/mock-access-control-hook-module/1.0.0";
+        return "erc6900.mock-access-control-hook-module.1.0.0";
     }
 
     function supportsInterface(bytes4 interfaceId)
diff --git a/test/mocks/modules/PermittedCallMocks.sol b/test/mocks/modules/PermittedCallMocks.sol
index 0981160f..41931d4f 100644
--- a/test/mocks/modules/PermittedCallMocks.sol
+++ b/test/mocks/modules/PermittedCallMocks.sol
@@ -30,7 +30,7 @@ contract PermittedCallerModule is IExecutionModule, BaseModule {
     }
 
     function moduleId() external pure returns (string memory) {
-        return "erc6900/permitted-caller-module/1.0.0";
+        return "erc6900.permitted-caller-module.1.0.0";
     }
 
     // The manifest requested access to use the module-defined method "foo"
diff --git a/test/mocks/modules/ReturnDataModuleMocks.sol b/test/mocks/modules/ReturnDataModuleMocks.sol
index 3eb81fa7..1c7ff6a2 100644
--- a/test/mocks/modules/ReturnDataModuleMocks.sol
+++ b/test/mocks/modules/ReturnDataModuleMocks.sol
@@ -58,7 +58,7 @@ contract ResultCreatorModule is IExecutionModule, BaseModule {
     }
 
     function moduleId() external pure returns (string memory) {
-        return "erc6900/result-creator-module/1.0.0";
+        return "erc6900.result-creator-module.1.0.0";
     }
 }
 
@@ -139,6 +139,6 @@ contract ResultConsumerModule is IExecutionModule, BaseModule, IValidationModule
     }
 
     function moduleId() external pure returns (string memory) {
-        return "erc6900/result-consumer-module/1.0.0";
+        return "erc6900.result-consumer-module.1.0.0";
     }
 }
diff --git a/test/mocks/modules/ValidationModuleMocks.sol b/test/mocks/modules/ValidationModuleMocks.sol
index 3521e3fc..40e6ad26 100644
--- a/test/mocks/modules/ValidationModuleMocks.sol
+++ b/test/mocks/modules/ValidationModuleMocks.sol
@@ -75,7 +75,7 @@ abstract contract MockBaseUserOpValidationModule is
     }
 
     function moduleId() external pure returns (string memory) {
-        return "erc6900/mock-user-op-validation-module/1.0.0";
+        return "erc6900.mock-user-op-validation-module.1.0.0";
     }
 
     // Empty stubs