diff --git a/lectures/otagohandout.cls b/lectures/otagohandout.cls
index eb4106b..2a7b737 100644
--- a/lectures/otagohandout.cls
+++ b/lectures/otagohandout.cls
@@ -1,6 +1,6 @@
-\def\classdate{12 December 2024}
-\def\classversion{1.0.3}
-\def\classshortdate{2024/12/12}
+\def\classdate{16 July 2025}
+\def\classversion{1.1}
+\def\classshortdate{2025/07/16}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % Document class for lecture handout document.
@@ -12,6 +12,7 @@
 % v1.0.1  Tweaked header so it always fits.
 % v1.0.2  Corrected page number generation.
 % v1.0.3  Normalised package info messages.
+% v1.1    Switched to built-in LaTeX page hooks.
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
@@ -27,7 +28,7 @@
 
 % Load required packages.
 \RequirePackage{array}
-\RequirePackage{background}
+% \RequirePackage{background}
 \RequirePackage{pgfpages}
 
 
@@ -134,31 +135,27 @@
 \newlength{\headerwidth}
 % Three slides @ 0.3\pgfphysicalwidth plus two 5mm gaps.
 \setlength{\headerwidth}{0.9\pgfphysicalwidth+1cm}
-\SetBgAngle{0}
-% Scale factor looks about right, and seems logical.
-\SetBgScale{1.414}
-\SetBgColor{black}
-\SetBgOpacity{1}
-\SetBgPosition{current page.north}
-% Offsets from current page.north determined empirically.
-\SetBgVshift{-0.35\pgfphysicalheight}
-\SetBgHshift{0.317\pgfphysicalwidth+1.5mm}
-\SetBgContents{}
+
 \makeatletter
-\AddEverypageHook{%
+\AddToHook{shipout/background}{
     % Index off the first logical page, because it's the only one
     % we can guarantee to exist on any given page.
-    \ifnum\pgf@currentshipout=1%
-        \SetBgContents{%
-            \sffamily\bfseries\large%
-            \begin{tabular*}{\headerwidth}{@{}L{\headerwidth/3}@{}C{\headerwidth/3}@{}R{\headerwidth/3}@{}}%
-                \multicolumn{3}{@{}C{\headerwidth}@{}}{\resizebox*{\headerwidth}{!}{\Huge\PaperCode, \PaperTitle, \TeachingPeriod\ \YearOffered}} \\[0.85\pgfphysicalheight]%
-                % A skip of 0.85\pgfphysicalheight looks about right.
-                \ClassType\ \thechapter: \ShortClassTitle & Lecture Slides & \the\numexpr(\thepage-1)/6+1 \\%
-            \end{tabular*}%
-        }%
-    \fi%
-    \bg@material%
+    \begin{tikzpicture}[remember picture, overlay]
+        \ifnum\pgf@currentshipout=1%
+            % Scale factor of 1.414 looks about right, and seems logical.
+            \node[scale=1.414, font=\sffamily\bfseries\Huge]
+                % Offsets from current page.north determined empirically.
+                at ($(current page.north) + (\paperwidth+7.2mm,0.2175\paperheight)$) {
+                \resizebox*{\headerwidth}{!}{\PaperCode, \PaperTitle, \TeachingPeriod\ \YearOffered}
+            };
+            \node[scale=1.414, font=\sffamily\bfseries\large]
+                at ($(current page.north) + (\paperwidth+7.2mm,-2.459\paperheight)$) {
+                \begin{tabular*}{\headerwidth}{@{}L{\headerwidth/3}@{}C{\headerwidth/3}@{}R{\headerwidth/3}@{}}%
+                    \ClassType\ \thechapter: \ShortClassTitle & Lecture Slides & \the\numexpr(\thepage-1)/6+1 \\%
+                \end{tabular*}%
+            };
+        \fi%
+    \end{tikzpicture}
 }
 \makeatother