diff --git a/CHANGELOG.md b/CHANGELOG.md
index e7b1150..8d0a05e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,10 @@
 # Release notes
 
-## Version 2026.1.1,  - 2026-01-xx
+## Version 2026.1,  - 2026-02-05
 
 ### Changed
 - changed boost version to 1.88, switch to c++-14
+- update objcryst to include PowderPattern::SetPowderPatternObsSigma
 
 ## Version 2024.2.1,  - 2024-09-09
 
diff --git a/site_scons/fallback_version.py b/site_scons/fallback_version.py
index ac917bb..d8dbb6b 100644
--- a/site_scons/fallback_version.py
+++ b/site_scons/fallback_version.py
@@ -7,4 +7,4 @@
 Update FALLBACK_VERSION when tagging a new release.
 '''
 
-FALLBACK_VERSION = '2024.2.1.post0'
+FALLBACK_VERSION = '2026.1.post0'
diff --git a/src/objcryst b/src/objcryst
index d40d537..057a585 160000
--- a/src/objcryst
+++ b/src/objcryst
@@ -1 +1 @@
-Subproject commit d40d537b642abc0211ccd071e459c7ccb3495c3d
+Subproject commit 057a5853de325aa2bb5b87e4358b9b5a3d6b5ae3