Transpile fa89564c

contracts/package-lock.json

+{
+  "name": "@openzeppelin/contracts-upgradeable",
+  "version": "3.4.1",
+  "lockfileVersion": 1
+}

contracts/package.json

 {
   "name": "@openzeppelin/contracts-upgradeable",
   "description": "Secure Smart Contract library for Solidity",
-  "version": "3.4.1-solc-0.7",
+  "version": "3.4.1-solc-0.7-2",
   "files": [
     "**/*.sol",
     "/build/contracts/*.json",

contracts/token/ERC721/ERC721Upgradeable.sol

@@ -456,7 +456,12 @@ contract ERC721Upgradeable is Initializable, ContextUpgradeable, ERC165Upgradeab
         return (retval == _ERC721_RECEIVED);
     }
 
-    function _approve(address to, uint256 tokenId) private {
+    /**
+     * @dev Approve `to` to operate on `tokenId`
+     *
+     * Emits an {Approval} event.
+     */
+    function _approve(address to, uint256 tokenId) internal virtual {
         _tokenApprovals[tokenId] = to;
         emit Approval(ERC721Upgradeable.ownerOf(tokenId), to, tokenId); // internal owner
     }

package-lock.json

 {
   "name": "openzeppelin-solidity",
-  "version": "3.4.1-solc-0.7",
+  "version": "3.4.1-solc-0.7-2",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

package.json

@@ -2,7 +2,7 @@
   "private": true,
   "name": "openzeppelin-solidity",
   "description": "Secure Smart Contract library for Solidity",
-  "version": "3.4.1-solc-0.7",
+  "version": "3.4.1-solc-0.7-2",
   "files": [
     "/contracts/**/*.sol",
     "/build/contracts/*.json",

scripts/upgradeable/transpile.sh

@@ -8,7 +8,7 @@ npm run compile
 # -i: use included Initializable
 # -x: exclude all proxy contracts except Clones library
 # -p: emit public initializer
-npx @openzeppelin/upgrade-safe-transpiler -D \
+npx @openzeppelin/upgrade-safe-transpiler@^0.1.0 -D \
   -i contracts/proxy/Initializable.sol \
   -x 'contracts/proxy/**/*' \
   -x '!contracts/proxy/Clones.sol' \