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3. Changelog

This changelog provides information on changes across the Fastly platform, including to the VCL language, our public API, CLI, Terraform provider, Compute Rust SDK, Compute JavaScript SDK, Compute Go SDK and Next-Gen WAF.

• February 24, 2026
  JavaScript SDKFixes

  JavaScript SDK 3.40.1

• February 17, 2026
  JavaScript SDKFixesAdditions

  JavaScript SDK 3.40.0

• February 13, 2026
  JavaScript SDKFixes

  JavaScript SDK 3.39.4

• February 12, 2026
  JavaScript SDKFixes

  JavaScript SDK 3.39.3

• February 9, 2026
  JavaScript SDKFixes

  JavaScript SDK 3.39.1

• February 9, 2026
  JavaScript SDKFixes

  JavaScript SDK 3.39.2

• January 29, 2026
  Next-Gen WAF announcementsFixes

  Idle session timeout standardization

• January 28, 2026
  JavaScript SDKFixesAdditions

  JavaScript SDK 3.39.0

• January 23, 2026
  JavaScript SDKFixes

  JavaScript SDK 3.38.4

• January 22, 2026
  JavaScript SDKFixes

  JavaScript SDK 3.38.3