# Quantlab release 4143

**URL:** <https://quantlab.discourse.group/t/quantlab-release-4143/107>\
**Category:** Announcements\
**Created:** [March 27, 2025, 3:54pm UTC](https://quantlab.discourse.group/t/quantlab-release-4143/107 "2025-03-27T15:54:50Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![QuantlabAdmin](https://yyz1.discourse-cdn.com/flex003/user_avatar/quantlab.discourse.group/quantlabadmin/32/10_2.png) [@QuantlabAdmin](https://quantlab.discourse.group/u/QuantlabAdmin)\
**Post date:** [March 27, 2025, 3:54pm UTC](https://quantlab.discourse.group/t/quantlab-release-4143/107/1 "2025-03-27T15:54:50Z")

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A summary of the changes in versions 4134–4143:

### **Quantlab**

- Fixed parser crashes and JSON handling bugs.
- Improved support for SSL in HTTP server and client.
- Optimized `operator+` for strings and `strcat()`.
- Fixed issues with dataset node handling and debugging.
- License enforcement updated.

### **Dev UI**

- Fixed UI glitches related to tabs, dialogs, and source configuration.
- Improved anti-aliasing and general UI aesthetics.
- Session files now save only on exit or explicit user action.

### **Financial libraries**

- Enhancements to Stochastic Models: Added and modified various files related to Greek calculations, finite difference methods (1D & 2D), and stochastic simulations (Heston, SABR, Hull-White, etc.).
- New Features in Instrument Testing Lab: Introduced multiple new files for bond, bond option, callable bond testing, and related market/model state handling.
- Improvements in Grid Valuation Methods: Updates to grid creation, dividend utilities, and class structures.
- Monte Carlo and Risk Factor Enhancements: Modifications to MC simulation and series data handling.
- Bloomberg & Variance Gamma Models: Calibration updates and utility adjustments.
- General Refinements: Various optimizations, bug fixes, and structural updates across mathematical and stochastic modeling components.