6 files changed, 21 insertions, 8 deletions
diff --git a/Master/texmf-dist/doc/latex/siunitx/CHANGELOG.md b/Master/texmf-dist/doc/latex/siunitx/CHANGELOG.md
index 4db74bbc007..3aebf9976fa 100644
--- a/Master/texmf-dist/doc/latex/siunitx/CHANGELOG.md
+++ b/Master/texmf-dist/doc/latex/siunitx/CHANGELOG.md
@@ -7,6 +7,15 @@ Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to
 
 ## [Unreleased]
 
+## [v3.0.35]
+
+### Changed
+- Delay loading of `color` package to `begindocument` hook
+
+### Fixed
+- Text mode replacement of `\mathrm` in super/subscripts (see issue
+  [#556](https://github.com/josephwright/siunitx/issues/556))
+
 ## [v3.0.34]
 
 ### Fixed
@@ -1613,7 +1622,8 @@ Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to
 ### Added
 - First public testing release (as `si`)
 
-[Unreleased]: https://github.com/josephwright/siunitx/compare/v3.0.34...HEAD
+[Unreleased]: https://github.com/josephwright/siunitx/compare/v3.0.35...HEAD
+[v3.0.35]: https://github.com/josephwright/siunitx/compare/v3.0.34...v3.0.35
 [v3.0.34]: https://github.com/josephwright/siunitx/compare/v3.0.33...v3.0.34
 [v3.0.33]: https://github.com/josephwright/siunitx/compare/v3.0.32...v3.0.33
 [v3.0.32]: https://github.com/josephwright/siunitx/compare/v3.0.31...v3.0.32
diff --git a/Master/texmf-dist/doc/latex/siunitx/siunitx-code.pdf b/Master/texmf-dist/doc/latex/siunitx/siunitx-code.pdf
index 5ea13cc569d..64dae8774b0 100644
--- a/Master/texmf-dist/doc/latex/siunitx/siunitx-code.pdf
+++ b/Master/texmf-dist/doc/latex/siunitx/siunitx-code.pdf
diff --git a/Master/texmf-dist/doc/latex/siunitx/siunitx.pdf b/Master/texmf-dist/doc/latex/siunitx/siunitx.pdf
index d1dadd2e95d..bb59f341272 100644
--- a/Master/texmf-dist/doc/latex/siunitx/siunitx.pdf
+++ b/Master/texmf-dist/doc/latex/siunitx/siunitx.pdf
diff --git a/Master/texmf-dist/source/latex/siunitx/siunitx-print.dtx b/Master/texmf-dist/source/latex/siunitx/siunitx-print.dtx
index 4f107b5cbb5..5bcc08f65b0 100644
--- a/Master/texmf-dist/source/latex/siunitx/siunitx-print.dtx
+++ b/Master/texmf-dist/source/latex/siunitx/siunitx-print.dtx
@@ -313,9 +313,10 @@
 %    \end{macrocode}
 % \end{macro}
 %
-% Color support is always required.
+% Color support is always required; to avoid a potential clash we delay to
+% the start of the document.
 %    \begin{macrocode}
-\RequirePackage { color }
+\AtBeginDocument { \RequirePackage { color } }
 %    \end{macrocode}
 %
 % \begin{macro}{\tl_replace_all:NVn}
@@ -816,7 +817,8 @@
         { \@@_text_replace:Nnnnn #1 }
         {
           \tl_set:Nn \l_@@_tmp_tl {#1}
-          \@@_replace_font:N \l_@@_tmp_tl
+          \tl_if_empty:NF \l_siunitx_unit_font_tl
+            { \exp_after:wN \cs_set_eq:NN \l_siunitx_unit_font_tl \use:n }
           \cs_set:Npn \mathord ##1 {##1}
           \cs_set:Npn \pm { \exp_not:N \textpm }
           \tl_map_inline:nn
diff --git a/Master/texmf-dist/source/latex/siunitx/siunitx.dtx b/Master/texmf-dist/source/latex/siunitx/siunitx.dtx
index cdf49b261c8..6fd0040427c 100644
--- a/Master/texmf-dist/source/latex/siunitx/siunitx.dtx
+++ b/Master/texmf-dist/source/latex/siunitx/siunitx.dtx
@@ -121,7 +121,7 @@
 %
 % Identify the package and give the over all version information.
 %    \begin{macrocode}
-\ProvidesExplPackage {siunitx} {2021-10-26} {3.0.34}
+\ProvidesExplPackage {siunitx} {2021-11-03} {3.0.35}
   {A comprehensive (SI) units package}
 %    \end{macrocode}
 %
diff --git a/Master/texmf-dist/tex/latex/siunitx/siunitx.sty b/Master/texmf-dist/tex/latex/siunitx/siunitx.sty
index d01d2352ae6..5ec91a8d1c8 100644
--- a/Master/texmf-dist/tex/latex/siunitx/siunitx.sty
+++ b/Master/texmf-dist/tex/latex/siunitx/siunitx.sty
@@ -42,7 +42,7 @@
       }%
     \endinput
   }%
-\ProvidesExplPackage {siunitx} {2021-10-26} {3.0.34}
+\ProvidesExplPackage {siunitx} {2021-11-03} {3.0.35}
   {A comprehensive (SI) units package}
 \msg_new:nnnn { siunitx } { incompatible-package }
   { Package~'#1'~incompatible. }
@@ -3625,7 +3625,7 @@
   }
 \RequirePackage { amstext }
 \cs_new_eq:NN \__siunitx_print_ams_text:n \text
-\RequirePackage { color }
+\AtBeginDocument { \RequirePackage { color } }
 \cs_generate_variant:Nn \tl_replace_all:Nnn { NV }
 \tl_new:N \l__siunitx_print_tmp_tl
 \tl_new:N \l__siunitx_print_number_mode_tl
@@ -3915,7 +3915,8 @@
         { \__siunitx_print_text_replace:Nnnnn #1 }
         {
           \tl_set:Nn \l__siunitx_print_tmp_tl {#1}
-          \__siunitx_print_replace_font:N \l__siunitx_print_tmp_tl
+          \tl_if_empty:NF \l_siunitx_unit_font_tl
+            { \exp_after:wN \cs_set_eq:NN \l_siunitx_unit_font_tl \use:n }
           \cs_set:Npn \mathord ##1 {##1}
           \cs_set:Npn \pm { \exp_not:N \textpm }
           \tl_map_inline:nn