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Firebird 4.0 is a milestone release of the open-source relational database that introduces significant improvements in data types, replication, and security. While Firebird 5.0 is now available, the 4.0 series remains a stable and widely used choice for production environments. Direct Download Links

Firebird 4.0 focuses on modernization without radical architectural changes. Short Firebird Migration Guide to Firebird 4.0 - IBSurgeon firebird 4.0 download

The most recent stable sub-release is , released on April 17, 2026 . Windows 64-bit: Official Installer (EXE) | Zip Kit Windows 32-bit: Official Installer (EXE) Linux (AMD64): Compressed Tarball Source Code: v4.0.7 Source Tarball Major New Features in Firebird 4.0 Firebird 4