diff --git a/debian.changelog b/debian.changelog
index 445a79f..d83e355 100644
--- a/debian.changelog
+++ b/debian.changelog
@@ -1,4 +1,4 @@
-mapi-header-php (1.0.13.f8f3255) unstable; urgency=low
+mapi-header-php (1.1.0.70e984f) unstable; urgency=low
 
   * Initial package.
 
diff --git a/mapi-header-php-1.0.13.f8f3255.tar.xz b/mapi-header-php-1.0.13.f8f3255.tar.xz
deleted file mode 100644
index 8009ba1..0000000
--- a/mapi-header-php-1.0.13.f8f3255.tar.xz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:71f6f1b75f1494abe45e6fb2450f79ac9a58c3416fc468a6bf1c4f421f6714bb
-size 87064
diff --git a/mapi-header-php-1.1.0.70e984f.tar.xz b/mapi-header-php-1.1.0.70e984f.tar.xz
new file mode 100644
index 0000000..06ca23d
--- /dev/null
+++ b/mapi-header-php-1.1.0.70e984f.tar.xz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:204e06bbfbe64222cf4292c5a27beb53370bdb66e9f8227a38b880d665335f6d
+size 84572
diff --git a/mapi-header-php.changes b/mapi-header-php.changes
index 72fcfa4..8aad7aa 100644
--- a/mapi-header-php.changes
+++ b/mapi-header-php.changes
@@ -1,3 +1,11 @@
+-------------------------------------------------------------------
+Mon Feb 27 12:17:12 UTC 2023 - Jan Engelhardt <jengelh@inai.de>
+
+- Update to tag 1.1 (70e984f)
+  * Add a prefix to the CAL_DEFAULT and CAL_GREGORIAN constants to
+    avoid runtime conflict with php-calendar
+  * Remove mapi_strerror since it was moved to Gromox/PHP-MAPI
+
 -------------------------------------------------------------------
 Fri Jan 13 23:39:56 UTC 2023 - Jan Engelhardt <jengelh@inai.de>
 
diff --git a/mapi-header-php.dsc b/mapi-header-php.dsc
index e8daa0f..62ad7e2 100644
--- a/mapi-header-php.dsc
+++ b/mapi-header-php.dsc
@@ -1,7 +1,7 @@
 Format: 1.0
 Source: mapi-header-php
 Architecture: any
-Version: 1.0.13.f8f3255
+Version: 1.1.0.70e984f
 DEBTRANSFORM-RELEASE: 1
 Maintainer: Grommunio <null@grommunio.com>
 Homepage: https://grommunio.com
diff --git a/mapi-header-php.spec b/mapi-header-php.spec
index 987b17e..a869823 100644
--- a/mapi-header-php.spec
+++ b/mapi-header-php.spec
@@ -19,7 +19,7 @@
 %define _empty_manifest_terminate_build 0
 
 Name:           mapi-header-php
-Version:        1.0.13.f8f3255
+Version:        1.1.0.70e984f
 Release:        0
 Summary:        Common PHP MAPI header files for grommunio
 License:        AGPL-3.0-or-later