Sparrow Wallet has released version 2.5.5, patching several defects identified during a recent security review. The update also introduces a new theme option that automatically adjusts to the operating system's light and dark mode settings. Developer Craig Raw signed and published the release on September 17. While the specific nature and severity of the fixed vulnerabilities remain undisclosed, hardware wallet manufacturer COLDCARD has endorsed the announcement, signaling the update's importance for user security.