diff --git a/releases/signatures.txt b/releases/signatures.txt
index 035c1287..7ad1857a 100644
--- a/releases/signatures.txt
+++ b/releases/signatures.txt
@@ -5,6 +5,8 @@ Hash: SHA256
 8f71336a78573ccbd19b782e4f6e5930a8f944517884fe02d26eb0f38bf5c3ac  Mk3ChangeLog.md
 a0c4d0ac3881a36704f0b620a13c72704531f656ee29368d5aac87dc5f21c7a1  History.md
 9f91f9dba7dfd7663586e132181ffc6e2752da1c2ba146f15ba45c1eaa2420c0  ChangeLog.md
+06d1048bea43c5d7c72c5e5f395a676620ce884aed0cd152627a86d922e2f3ab  2023-12-19T1444-v5.2.1-mk4-coldcard.dfu
+3eb9c4b1add88a6fe412d783b8f4b895241a67e423bbacc6a13816a5216a30fe  2023-12-19T1444-v5.2.1-mk4-coldcard-factory.dfu
 8b82811a7729eeaa0d9dd45fab4b74b37706a9fd6d045e6b06070a935d774613  2023-12-18T1636-v5.2.1-mk4-coldcard.dfu
 d9bbb2ceeeec8c4279491f614a403001c3be1a5804bdd8ecd88d9fb2c2c9f50a  2023-12-18T1636-v5.2.1-mk4-coldcard-factory.dfu
 f4457dc44d08cbed9517e6260aa7163ecc254457276d3cdb0c2611af0f49ba9b  2023-10-26T1343-v6.2.1X-mk4-coldcard.dfu
@@ -49,12 +51,12 @@ f05bc8dfed047c0c0abe5ed60621d2d14899b10717221c4af0942d96a1754f33  2021-03-29T192
 bea27f263b524a66b3ed0a58c16805e98be0d7c3db20c2f7aab3238f2c6a6995  2019-12-19T1623-v3.0.6-coldcard.dfu
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