diff --git a/contrib/devtools/headerssync-params.py b/contrib/devtools/headerssync-params.py
index f8e415532a0..4640718cb7e 100755
--- a/contrib/devtools/headerssync-params.py
+++ b/contrib/devtools/headerssync-params.py
@@ -12,13 +12,13 @@ import random
 # Parameters:
 
 # Aim for still working fine at some point in the future. [datetime]
-TIME = datetime(2027, 4, 1)
+TIME = datetime(2027, 10, 6)
 
 # Expected block interval. [timedelta]
 BLOCK_INTERVAL = timedelta(seconds=600)
 
 # The number of headers corresponding to the minchainwork parameter. [headers]
-MINCHAINWORK_HEADERS = 856760
+MINCHAINWORK_HEADERS = 886157
 
 # Combined processing bandwidth from all attackers to one victim. [bit/s]
 # 6 Gbit/s is approximately the speed at which a single thread of a Ryzen 5950X CPU thread can hash
diff --git a/src/headerssync.cpp b/src/headerssync.cpp
index b134ef6452d..9e8b1905168 100644
--- a/src/headerssync.cpp
+++ b/src/headerssync.cpp
@@ -13,11 +13,11 @@
 // contrib/devtools/headerssync-params.py.
 
 //! Store one header commitment per HEADER_COMMITMENT_PERIOD blocks.
-constexpr size_t HEADER_COMMITMENT_PERIOD{615};
+constexpr size_t HEADER_COMMITMENT_PERIOD{624};
 
 //! Only feed headers to validation once this many headers on top have been
 //! received and validated against commitments.
-constexpr size_t REDOWNLOAD_BUFFER_SIZE{14621}; // 14621/615 = ~23.8 commitments
+constexpr size_t REDOWNLOAD_BUFFER_SIZE{14827}; // 14827/624 = ~23.8 commitments
 
 // Our memory analysis assumes 48 bytes for a CompressedHeader (so we should
 // re-calculate parameters if we compress further)