diff --git a/src/extension/token/metadata/SimpleMetadataERC1155.sol b/src/extension/token/metadata/SimpleMetadataERC1155.sol
index 436a5eff..4106b261 100644
--- a/src/extension/token/metadata/SimpleMetadataERC1155.sol
+++ b/src/extension/token/metadata/SimpleMetadataERC1155.sol
@@ -10,7 +10,7 @@ contract SimpleMetadataERC1155 is SimpleMetadataERC721 {
         config.callbackFunctions = new CallbackFunction[](1);
         config.fallbackFunctions = new FallbackFunction[](1);
 
-        config.callbackFunctions[0] = CallbackFunction(this.onTokenURI.selector, CallType.CALL);
+        config.callbackFunctions[0] = CallbackFunction(this.onTokenURI.selector, CallType.STATICCALL);
         config.fallbackFunctions[0] = FallbackFunction({
             selector: this.setTokenURI.selector,
             callType: CallType.CALL,
diff --git a/src/extension/token/metadata/SimpleMetadataERC721.sol b/src/extension/token/metadata/SimpleMetadataERC721.sol
index 4a9e6c61..d9e15d75 100644
--- a/src/extension/token/metadata/SimpleMetadataERC721.sol
+++ b/src/extension/token/metadata/SimpleMetadataERC721.sol
@@ -42,7 +42,7 @@ contract SimpleMetadataERC721 is ModularExtension {
         config.callbackFunctions = new CallbackFunction[](1);
         config.fallbackFunctions = new FallbackFunction[](1);
 
-        config.callbackFunctions[0] = CallbackFunction(this.onTokenURI.selector, CallType.CALL);
+        config.callbackFunctions[0] = CallbackFunction(this.onTokenURI.selector, CallType.STATICCALL);
         config.fallbackFunctions[0] = FallbackFunction({
             selector: this.setTokenURI.selector,
             callType: CallType.CALL,
diff --git a/test/extension/BatchMetadataERC1155.t.sol b/test/extension/metadata/BatchMetadataERC1155.t.sol
similarity index 100%
rename from test/extension/BatchMetadataERC1155.t.sol
rename to test/extension/metadata/BatchMetadataERC1155.t.sol
diff --git a/test/extension/BatchMetadataERC721.t.sol b/test/extension/metadata/BatchMetadataERC721.t.sol
similarity index 100%
rename from test/extension/BatchMetadataERC721.t.sol
rename to test/extension/metadata/BatchMetadataERC721.t.sol
diff --git a/test/extension/DelayedRevealBatchMetadataERC721.t.sol b/test/extension/metadata/DelayedRevealBatchMetadataERC721.t.sol
similarity index 100%
rename from test/extension/DelayedRevealBatchMetadataERC721.t.sol
rename to test/extension/metadata/DelayedRevealBatchMetadataERC721.t.sol
diff --git a/test/extension/OpenEditionMetadataERC1155.t.sol b/test/extension/metadata/OpenEditionMetadataERC1155.t.sol
similarity index 100%
rename from test/extension/OpenEditionMetadataERC1155.t.sol
rename to test/extension/metadata/OpenEditionMetadataERC1155.t.sol
diff --git a/test/extension/OpenEditionMetadataERC721.t.sol b/test/extension/metadata/OpenEditionMetadataERC721.t.sol
similarity index 100%
rename from test/extension/OpenEditionMetadataERC721.t.sol
rename to test/extension/metadata/OpenEditionMetadataERC721.t.sol
diff --git a/test/extension/metadata/SimpleMetadataERC1155.t.sol b/test/extension/metadata/SimpleMetadataERC1155.t.sol
new file mode 100644
index 00000000..99149845
--- /dev/null
+++ b/test/extension/metadata/SimpleMetadataERC1155.t.sol
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.0;
+
+import "lib/forge-std/src/console.sol";
+
+import {Test} from "forge-std/Test.sol";
+import {ERC1967Factory} from "@solady/utils/ERC1967Factory.sol";
+import {ERC1967FactoryConstants} from "@solady/utils/ERC1967FactoryConstants.sol";
+
+// Target contract
+import {IExtensionConfig} from "src/interface/IExtensionConfig.sol";
+import {IModularCore} from "src/interface/IModularCore.sol";
+import {ModularExtension} from "src/ModularExtension.sol";
+import {ModularCoreUpgradeable} from "src/ModularCoreUpgradeable.sol";
+import {ERC1155Core} from "src/core/token/ERC1155Core.sol";
+import {SimpleMetadataERC1155} from "src/extension/token/metadata/SimpleMetadataERC1155.sol";
+import {SimpleMetadataERC721, SimpleMetadataStorage} from "src/extension/token/metadata/SimpleMetadataERC721.sol";
+
+contract SimpleMetadataExt is SimpleMetadataERC1155 {
+    function uris(address token, uint256 id) external view returns (string memory) {
+        return SimpleMetadataStorage.data().uris[token][id];
+    }
+}
+
+contract SimpleMetadataERC1155Test is Test {
+    ERC1155Core public core;
+
+    SimpleMetadataExt public extensionImplementation;
+    SimpleMetadataExt public installedExtension;
+
+    address public owner = address(0x1);
+    address public permissionedActor = address(0x2);
+    address public unpermissionedActor = address(0x3);
+
+    function setUp() public {
+        // Deterministic, canonical ERC1967Factory contract
+        vm.etch(ERC1967FactoryConstants.ADDRESS, ERC1967FactoryConstants.BYTECODE);
+
+        address[] memory extensions;
+        bytes[] memory extensionData;
+
+        core = new ERC1155Core(ERC1967FactoryConstants.ADDRESS, "test", "TEST", "", owner, extensions, extensionData);
+        extensionImplementation = new SimpleMetadataExt();
+
+        // install extension
+        vm.prank(owner);
+        core.installExtension(address(extensionImplementation), "");
+
+        IModularCore.InstalledExtension[] memory installedExtensions = core.getInstalledExtensions();
+        installedExtension = SimpleMetadataExt(installedExtensions[0].implementation);
+    }
+
+    /*///////////////////////////////////////////////////////////////
+                        Unit tests: `setTokenURI`
+    //////////////////////////////////////////////////////////////*/
+
+    function test_state_setTokenURI() public {
+        vm.prank(owner);
+        SimpleMetadataExt(address(core)).setTokenURI(1, "ipfs://base/1");
+
+        vm.prank(owner);
+        SimpleMetadataExt(address(core)).setTokenURI(2, "ipfs://base/2");
+
+        // read state from core
+        assertEq(core.uri(1), "ipfs://base/1");
+        assertEq(core.uri(2), "ipfs://base/2");
+        assertEq(core.uri(3), "");
+
+        // read state from the installed extension
+        assertEq(installedExtension.uris(address(core), 1), "ipfs://base/1");
+        assertEq(installedExtension.uris(address(core), 2), "ipfs://base/2");
+        assertEq(installedExtension.uris(address(core), 3), "");
+    }
+
+    function test_revert_setTokenURI() public {
+        vm.expectRevert(0x82b42900); // `Unauthorized()`
+        SimpleMetadataExt(address(core)).setTokenURI(1, "ipfs://base/");
+    }
+}
diff --git a/test/extension/metadata/SimpleMetadataERC721.t.sol b/test/extension/metadata/SimpleMetadataERC721.t.sol
new file mode 100644
index 00000000..1f647ffb
--- /dev/null
+++ b/test/extension/metadata/SimpleMetadataERC721.t.sol
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.0;
+
+import "lib/forge-std/src/console.sol";
+
+import {Test} from "forge-std/Test.sol";
+import {ERC1967Factory} from "@solady/utils/ERC1967Factory.sol";
+import {ERC1967FactoryConstants} from "@solady/utils/ERC1967FactoryConstants.sol";
+
+// Target contract
+import {IExtensionConfig} from "src/interface/IExtensionConfig.sol";
+import {IModularCore} from "src/interface/IModularCore.sol";
+import {ModularExtension} from "src/ModularExtension.sol";
+import {ModularCoreUpgradeable} from "src/ModularCoreUpgradeable.sol";
+import {ERC721Core} from "src/core/token/ERC721Core.sol";
+import {SimpleMetadataERC721, SimpleMetadataStorage} from "src/extension/token/metadata/SimpleMetadataERC721.sol";
+
+contract SimpleMetadataExt is SimpleMetadataERC721 {
+    function uris(address token, uint256 id) external view returns (string memory) {
+        return SimpleMetadataStorage.data().uris[token][id];
+    }
+}
+
+contract SimpleMetadataERC721Test is Test {
+    ERC721Core public core;
+
+    SimpleMetadataExt public extensionImplementation;
+    SimpleMetadataExt public installedExtension;
+
+    address public owner = address(0x1);
+    address public permissionedActor = address(0x2);
+    address public unpermissionedActor = address(0x3);
+
+    function setUp() public {
+        // Deterministic, canonical ERC1967Factory contract
+        vm.etch(ERC1967FactoryConstants.ADDRESS, ERC1967FactoryConstants.BYTECODE);
+
+        address[] memory extensions;
+        bytes[] memory extensionData;
+
+        core = new ERC721Core(ERC1967FactoryConstants.ADDRESS, "test", "TEST", "", owner, extensions, extensionData);
+        extensionImplementation = new SimpleMetadataExt();
+
+        // install extension
+        vm.prank(owner);
+        core.installExtension(address(extensionImplementation), "");
+
+        IModularCore.InstalledExtension[] memory installedExtensions = core.getInstalledExtensions();
+        installedExtension = SimpleMetadataExt(installedExtensions[0].implementation);
+    }
+
+    /*///////////////////////////////////////////////////////////////
+                        Unit tests: `setTokenURI`
+    //////////////////////////////////////////////////////////////*/
+
+    function test_state_setTokenURI() public {
+        vm.prank(owner);
+        SimpleMetadataExt(address(core)).setTokenURI(1, "ipfs://base/1");
+
+        vm.prank(owner);
+        SimpleMetadataExt(address(core)).setTokenURI(2, "ipfs://base/2");
+
+        // read state from core
+        assertEq(core.tokenURI(1), "ipfs://base/1");
+        assertEq(core.tokenURI(2), "ipfs://base/2");
+        assertEq(core.tokenURI(3), "");
+
+        // read state from the installed extension
+        assertEq(installedExtension.uris(address(core), 1), "ipfs://base/1");
+        assertEq(installedExtension.uris(address(core), 2), "ipfs://base/2");
+        assertEq(installedExtension.uris(address(core), 3), "");
+    }
+
+    function test_revert_setTokenURI() public {
+        vm.expectRevert(0x82b42900); // `Unauthorized()`
+        SimpleMetadataExt(address(core)).setTokenURI(1, "ipfs://base/");
+    }
+}