9 files changed, 18 insertions, 9 deletions
diff --git a/Master/texmf-dist/doc/latex/beamer/CHANGELOG.md b/Master/texmf-dist/doc/latex/beamer/CHANGELOG.md
index cc44d05103a..bf3bb51f4cb 100644
--- a/Master/texmf-dist/doc/latex/beamer/CHANGELOG.md
+++ b/Master/texmf-dist/doc/latex/beamer/CHANGELOG.md
@@ -8,6 +8,13 @@ a major and minor version only.
 
 ## [Unreleased]
 
+## [v3.66]
+
+### Fixed
+
+- fixed edge case in numbering of hidden and unnumbered frames (see #756) 
+- fixed regression of class options not being passed to packages like xcolor (see #759)
+
 ## [v3.65]
 
 ### Added
@@ -186,7 +193,8 @@ a major and minor version only.
 - Support for `noxcolor` with `beamerarticle` (see #483)
 - Treatment of mixed overlay/alert specifications
 
-[Unreleased]: https://github.com/josephwright/beamer/compare/v3.65...HEAD
+[Unreleased]: https://github.com/josephwright/beamer/compare/v3.66...HEAD
+[v3.66]: https://github.com/josephwright/beamer/compare/v3.65...v3.66
 [v3.65]: https://github.com/josephwright/beamer/compare/v3.64...v3.65
 [v3.64]: https://github.com/josephwright/beamer/compare/v3.63...v3.64
 [v3.63]: https://github.com/josephwright/beamer/compare/v3.62...v3.63
diff --git a/Master/texmf-dist/doc/latex/beamer/beamerexample-conference-talk.pdf b/Master/texmf-dist/doc/latex/beamer/beamerexample-conference-talk.pdf
index 18854724fbf..0fdd705324f 100644
--- a/Master/texmf-dist/doc/latex/beamer/beamerexample-conference-talk.pdf
+++ b/Master/texmf-dist/doc/latex/beamer/beamerexample-conference-talk.pdf
diff --git a/Master/texmf-dist/doc/latex/beamer/beamerexample-lecture-beamer-version.pdf b/Master/texmf-dist/doc/latex/beamer/beamerexample-lecture-beamer-version.pdf
index 944799cbdd0..9e1b92e0996 100644
--- a/Master/texmf-dist/doc/latex/beamer/beamerexample-lecture-beamer-version.pdf
+++ b/Master/texmf-dist/doc/latex/beamer/beamerexample-lecture-beamer-version.pdf
diff --git a/Master/texmf-dist/doc/latex/beamer/beamerexample-lecture-print-version.pdf b/Master/texmf-dist/doc/latex/beamer/beamerexample-lecture-print-version.pdf
index 49ed6ecdff1..ba2c3f9bae5 100644
--- a/Master/texmf-dist/doc/latex/beamer/beamerexample-lecture-print-version.pdf
+++ b/Master/texmf-dist/doc/latex/beamer/beamerexample-lecture-print-version.pdf
diff --git a/Master/texmf-dist/doc/latex/beamer/beameruserguide.pdf b/Master/texmf-dist/doc/latex/beamer/beameruserguide.pdf
index 6ef87a6ab64..f1462c75d54 100644
--- a/Master/texmf-dist/doc/latex/beamer/beameruserguide.pdf
+++ b/Master/texmf-dist/doc/latex/beamer/beameruserguide.pdf
diff --git a/Master/texmf-dist/doc/latex/beamer/beameruserguide.tex b/Master/texmf-dist/doc/latex/beamer/beameruserguide.tex
index 46002a15dfa..c45081be5b7 100644
--- a/Master/texmf-dist/doc/latex/beamer/beameruserguide.tex
+++ b/Master/texmf-dist/doc/latex/beamer/beameruserguide.tex
@@ -13,7 +13,7 @@
 
 \documentclass{ltxdoc}
 
-\def\beamerugversion{3.65}
+\def\beamerugversion{3.66}
 \def\beamerugpgfversion{3.1.7}
 \def\beamerugxcolorversion{2.00}
 
diff --git a/Master/texmf-dist/tex/latex/beamer/beamer.cls b/Master/texmf-dist/tex/latex/beamer/beamer.cls
index 2a831704f5a..7b07f7b6fe7 100644
--- a/Master/texmf-dist/tex/latex/beamer/beamer.cls
+++ b/Master/texmf-dist/tex/latex/beamer/beamer.cls
@@ -12,14 +12,14 @@
 % See the file doc/licenses/LICENSE for more details.
 
 \ProvidesClass{beamer}
-  [2022/01/21 v3.65 A class for typesetting presentations]
+  [2022/02/08 v3.66 A class for typesetting presentations]
 
 % Setup modes and check for article option
 % Also loads packages required by both beamer and beamerarticle
 \RequirePackage{beamerbasemodes}
 
 % For testing PDF versus DVI mode
-\RequirePackage{ifpdf}
+\RequirePackage{iftex}
 
 %
 %
@@ -351,7 +351,7 @@
 %
 
 % before processing beamer options for \pgfmathparse
-\RequirePackage{pgfcore}
+\RequirePackage{pgfmath}
 
 \ExecuteOptionsBeamer{c}
 \ProcessOptionsBeamer
@@ -363,6 +363,7 @@
 \beamer@filterclassoptions
 
 % Low-level graphic drawing and advanced color support.
+\RequirePackage{pgfcore}
 \RequirePackage{xxcolor}
 
 % Normally loaded by hyperref but to be on the safe side ...
diff --git a/Master/texmf-dist/tex/latex/beamer/beamerarticle.sty b/Master/texmf-dist/tex/latex/beamer/beamerarticle.sty
index 2d21347c2c0..9e398a50e0f 100644
--- a/Master/texmf-dist/tex/latex/beamer/beamerarticle.sty
+++ b/Master/texmf-dist/tex/latex/beamer/beamerarticle.sty
@@ -12,7 +12,7 @@
 % See the file doc/licenses/LICENSE for more details.
 
 \ProvidesPackage{beamerarticle}
-  [2022/01/21 v3.65 beamer input in article mode]
+  [2022/02/08 v3.66 beamer input in article mode]
 
 % Setup modes and check for article option
 % Also loads packages required by both beamer and beamerarticle
diff --git a/Master/texmf-dist/tex/latex/beamer/beamerbaseframe.sty b/Master/texmf-dist/tex/latex/beamer/beamerbaseframe.sty
index 1bbc1b9e5b8..00c8bab265a 100644
--- a/Master/texmf-dist/tex/latex/beamer/beamerbaseframe.sty
+++ b/Master/texmf-dist/tex/latex/beamer/beamerbaseframe.sty
@@ -411,7 +411,7 @@
   \def\beamer@defaultospec{#2}%
   \@ifnextchar[{\beamer@@@@frame<#1>}{\beamer@@@@frame<#1>[]}}
 
-\def\beamer@testzero{0}
+\def\beamer@testhidden{0}
 
 \newdimen\framewidth
 \def\beamer@frame<#1>{
@@ -442,10 +442,11 @@
   \setkeys{beamerframe}{environment=frame}%
   \setkeys{beamerframe}{#2}%
   \beamer@frametemplate%
+  \gdef\beamer@whichframes{#1}%
   \ifbeamer@isfragile%Fragile frames will be processed twice
     \stepcounter{framenumber}%do not set \label here - it interferes with AtBegin*
   \else%  
-    \ifx\beamer@whichframes\beamer@testzero\else
+    \ifx\beamer@whichframes\beamer@testhidden\else
       \ifbeamer@noframenumbering\else%
         \stepcounter{framenumber}%do not set \label here - it interferes with AtBegin*
       \fi%
@@ -453,7 +454,6 @@
   \fi%
   {\let\@elt\beamer@savecounter\beamer@overlaycounterresets}
   \gdef\beamer@framestartpage{}%
-  \gdef\beamer@whichframes{#1}%
   \ifx\beamer@framerestriction\@undefined\else% restriction stuff
     \expandafter\beamer@checkifinlist\beamer@framerestriction\relax%
   \fi%