diff --git a/.github/SECURITY.md b/.github/SECURITY.md
new file mode 100644
index 000000000..2f2871cea
--- /dev/null
+++ b/.github/SECURITY.md
@@ -0,0 +1,74 @@
+# Security Policy
+
+We truly appreciate efforts to discover and disclose security issues responsibly!
+
+## Vulnerabilities
+
+If you'd like to report a security issue in the repositories of matter-labs organization, please proceed to our
+[Bug Bounty Program on Immunefi](https://era.zksync.io/docs/reference/troubleshooting/audit-bug-bounty.html#bug-bounty-program).
+
+## Other Security Issues
+
+We take an impact-first approach instead of a rules-first approach. Therefore, if you believe you found the impactful
+issue but can't report it via the Bug Bounty, please email us at
+[security@matterlabs.dev](mailto:security@matterlabs.dev).
+
+### PGP Key
+
+The following PGP key may be used to communicate sensitive information to developers:
+
+Fingerprint: `5FED B2D0 EA2C 4906 DD66 71D7 A2C5 0B40 CE3C F297`
+
+```
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
+mQINBGEBmQkBEAD6tlkBEZFMvR8kOgxXX857nC2+oTik6TopJz4uCskuqDaeldMy
+l+26BBzLkIeO1loS+bzVgnNFJRrGt9gv98MzNEHJVv6D7GsSLlUX/pz7Lxn0J4ry
+o5XIk3MQTCUBdaXGs6GBLl5Xe8o+zNj4MKd4zjgDLinITNlE/YZCDsXyvYS3YFTQ
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+dKHENvg7d7kCDQRhAZleARAA6uD6WfdqGeKV5i170+kLsxR3QGav0qGNAbxpSJyn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+Ur/LGyz2Mj3ykbaP8p5mFVcUN51yQy6OcpvR/W1DfRT9SHFT/bCf9ixsjB2HlZGo
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+8WRxlaM0AGWXiJFIDD4bQPIdnF3X8w0cGWE5Otkb8mMHOT+rFTVlDODwm1zF6oIG
+PTwfVrpiZBwiUtfJol1exr/MzSPyGoJnYs3cRf2E3O+D1LbcR8w0LbjGuUy38Piz
+ZO/vCeyJ3JZC5kE8nD+XBA4idwzh0BKEfH9t+WchQ3Up9rxyzLyQamoqt5Xby4pY
+=xkM3
+-----END PGP PUBLIC KEY BLOCK-----
+```
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index f129e606f..dd3d45842 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,9 +1,44 @@
 # Contribution Guidelines
 
-Thank you for considering helping out with the source code! We are extremely grateful for any consideration of
-contributions to this repository. However, at this time, we generally do not accept external contributions. This policy
-will change in the future, so please check back regularly for updates.
+Hello! Thanks for your interest in joining the mission to accelerate the mass adoption of crypto for personal
+sovereignty! We welcome contributions from anyone on the internet, and are grateful for even the smallest of fixes!
 
-For security issues, please contact us at [security@matterlabs.dev](mailto:security@matterlabs.dev).
+## Ways to contribute
 
-Thank you for your support in accelerating the mass adoption of crypto for personal sovereignty!
+There are many ways to contribute to the ZK Stack:
+
+1. Open issues: if you find a bug, have something you believe needs to be fixed, or have an idea for a feature, please
+   open an issue.
+2. Add color to existing issues: provide screenshots, code snippets, and whatever you think would be helpful to resolve
+   issues.
+3. Resolve issues: either by showing an issue isn't a problem and the current state is ok as is or by fixing the problem
+   and opening a PR.
+4. Report security issues, see [our security policy](./github/SECURITY.md).
+5. [Join the team!](https://matterlabs.notion.site/Shape-the-future-of-Ethereum-at-Matter-Labs-dfb3b5a037044bb3a8006af2eb0575e0)
+
+## Fixing issues
+
+To contribute code fixing issues, please fork the repo, fix an issue, commit, add documentation as per the PR template,
+and the repo's maintainers will review the PR.
+[here](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request-from-a-fork)
+for guidance how to work with PRs created from a fork.
+
+## Licenses
+
+If you contribute to this project, your contributions will be made to the project under both Apache 2.0 and the MIT
+license.
+
+## Resources
+
+We aim to make it as easy as possible to contribute to the mission. This is still WIP, and we're happy for contributions
+and suggestions here too. Some resources to help:
+
+1. [In-repo docs aimed at developers](docs)
+2. [zkSync Era docs!](https://era.zksync.io/docs/)
+3. Company links can be found in the [repo's readme](README.md)
+
+## Code of Conduct
+
+Be polite and respectful.
+
+### Thank you
diff --git a/contracts/interfaces/ISystemContextDeprecated.sol b/contracts/interfaces/ISystemContextDeprecated.sol
new file mode 100644
index 000000000..40ead86db
--- /dev/null
+++ b/contracts/interfaces/ISystemContextDeprecated.sol
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity ^0.8.0;
+
+/**
+ * @author Matter Labs
+ * @notice The interface with deprecated functions of the SystemContext contract. It is aimed for backward compatibility.
+ */
+interface ISystemContextDeprecated {
+    function currentBlockInfo() external view returns(uint256);
+
+    function getBlockNumberAndTimestamp() external view returns (uint256 blockNumber, uint256 blockTimestamp);
+
+    function blockHash(uint256 _blockNumber) external view returns (bytes32 hash);
+}
diff --git a/package.json b/package.json
index a2116edb9..b4df9b82d 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "repository": "git@github.com:matter-labs/system-contracts.git",
   "license": "MIT",
   "dependencies": {
-    "@matterlabs/hardhat-zksync-deploy": "^0.6.3",
+    "@matterlabs/hardhat-zksync-deploy": "^0.6.5",
     "@nomiclabs/hardhat-solpp": "^2.0.1",
     "commander": "^9.4.1",
     "ethers": "^5.7.0",
@@ -13,7 +13,7 @@
     "zksync-web3": "^0.13.0"
   },
   "devDependencies": {
-    "@matterlabs/hardhat-zksync-solc": "^0.3.15",
+    "@matterlabs/hardhat-zksync-solc": "^0.4.2",
     "@nomiclabs/hardhat-ethers": "^2.0.6",
     "@typechain/ethers-v5": "^10.0.0",
     "@types/chai": "^4.3.1",