diff --git a/SPECS/tzdata/tzdata.signatures.json b/SPECS/tzdata/tzdata.signatures.json
index a73479c619f..f085b2f2c8d 100644
--- a/SPECS/tzdata/tzdata.signatures.json
+++ b/SPECS/tzdata/tzdata.signatures.json
@@ -1,6 +1,6 @@
 {
   "Signatures": {
-    "tzdata2025c.tar.gz": "4aa79e4effee53fc4029ffe5f6ebe97937282ebcdf386d5d2da91ce84142f957",
-    "tzcode2025c.tar.gz": "697ebe6625444aef5080f58e49d03424bbb52e08bf483d3ddb5acf10cbd15740"
+    "tzcode2025c.tar.gz": "697ebe6625444aef5080f58e49d03424bbb52e08bf483d3ddb5acf10cbd15740",
+    "tzdata2026b.tar.gz": "114543d9f19a6bfeb5bca43686aea173d38755a3db1f2eec112647ae92c6f544"
   }
 }
diff --git a/SPECS/tzdata/tzdata.spec b/SPECS/tzdata/tzdata.spec
index 18b95ad65b9..3992606a82f 100644
--- a/SPECS/tzdata/tzdata.spec
+++ b/SPECS/tzdata/tzdata.spec
@@ -1,7 +1,7 @@
 Summary:        Time zone data
 Name:           tzdata
-Version:        2025c
-Release:        2%{?dist}
+Version:        2026b
+Release:        1%{?dist}
 License:        Public Domain
 Vendor:         Microsoft Corporation
 Distribution:   Azure Linux
@@ -49,6 +49,9 @@ install -vpDm 644 tzdata.zi %{buildroot}%{_datadir}/zoneinfo/tzdata.zi
 %{_datadir}/*
 
 %changelog
+* Fri Apr 24 2026 CBL-Mariner Servicing Account <cblmargh@microsoft.com> - 2026b-1
+- Auto-upgrade to 2026b - upgrade to version 2026b
+
 * Tue Jan 06 2026 Madhur Aggarwal <madaggarwal@microsoft.com> - 2025c-2
 - Added Source1 tzcode, which is required to build tzdata.zi 
 - Packaged tzdata.zi file in /usr/share/zoneinfo
diff --git a/cgmanifest.json b/cgmanifest.json
index e0572d462b7..33306fb962e 100644
--- a/cgmanifest.json
+++ b/cgmanifest.json
@@ -29496,8 +29496,8 @@
         "type": "other",
         "other": {
           "name": "tzdata",
-          "version": "2025c",
-          "downloadUrl": "https://data.iana.org/time-zones/releases/tzdata2025c.tar.gz"
+          "version": "2026b",
+          "downloadUrl": "https://data.iana.org/time-zones/releases/tzdata2026b.tar.gz"
         }
       }
     },