diff --git a/contrib/devtools/headerssync-params.py b/contrib/devtools/headerssync-params.py
index 886ea583d71..884e00cd7d3 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(2028, 10, 10)
+TIME = datetime(2029, 4, 10)
 
 # Expected block interval. [timedelta]
 BLOCK_INTERVAL = timedelta(seconds=600)
 
 # The number of headers corresponding to the minchainwork parameter. [headers]
-MINCHAINWORK_HEADERS = 938343
+MINCHAINWORK_HEADERS = 966143
 
 # 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/kernel/chainparams.cpp b/src/kernel/chainparams.cpp
index 1e4b6786a76..c40958a0b7d 100644
--- a/src/kernel/chainparams.cpp
+++ b/src/kernel/chainparams.cpp
@@ -220,10 +220,10 @@ public:
             .dTxRate  = 7.851784479579372,
         };
 
-        // Generated by headerssync-params.py on 2026-02-25.
+        // Generated by headerssync-params.py on 2026-09-08.
         m_headers_sync_params = HeadersSyncParams{
-            .commitment_period = 641,
-            .redownload_buffer_size = 15218, // 15218/641 = ~23.7 commitments
+            .commitment_period = 649,
+            .redownload_buffer_size = 15400, // 15400/649 = ~23.7 commitments
         };
     }
 };
@@ -322,10 +322,10 @@ public:
             .dTxRate  = 0.02306697351149596,
         };
 
-        // Generated by headerssync-params.py on 2026-02-25.
+        // Generated by headerssync-params.py on 2026-09-08.
         m_headers_sync_params = HeadersSyncParams{
-            .commitment_period = 673,
-            .redownload_buffer_size = 14460, // 14460/673 = ~21.5 commitments
+            .commitment_period = 682,
+            .redownload_buffer_size = 14613, // 14613/682 = ~21.4 commitments
         };
     }
 };
@@ -429,10 +429,10 @@ public:
             .dTxRate  = 0.1148250171344748,
         };
 
-        // Generated by headerssync-params.py on 2026-02-25.
+        // Generated by headerssync-params.py on 2026-09-08.
         m_headers_sync_params = HeadersSyncParams{
-            .commitment_period = 606,
-            .redownload_buffer_size = 16092, // 16092/606 = ~26.6 commitments
+            .commitment_period = 616,
+            .redownload_buffer_size = 16199, // 16199/616 = ~26.3 commitments
         };
     }
 };
@@ -548,10 +548,10 @@ public:
         fDefaultConsistencyChecks = false;
         m_is_mockable_chain = false;
 
-        // Generated by headerssync-params.py on 2026-02-25.
+        // Generated by headerssync-params.py on 2026-09-08.
         m_headers_sync_params = HeadersSyncParams{
-            .commitment_period = 620,
-            .redownload_buffer_size = 15724, // 15724/620 = ~25.4 commitments
+            .commitment_period = 629,
+            .redownload_buffer_size = 15885, // 15885/629 = ~25.3 commitments
         };
     }
 };