diff --git a/texmf/tex/latex/l3kernel/expl3-code.tex b/texmf/tex/latex/l3kernel/expl3-code.tex
index ad794af1d..a6117989a 100644
--- a/texmf/tex/latex/l3kernel/expl3-code.tex
+++ b/texmf/tex/latex/l3kernel/expl3-code.tex
@@ -70,7 +70,7 @@
 %% and all files in that bundle must be distributed together.
 %% 
 %% File: expl3.dtx
-\def\ExplFileDate{2022-07-14}%
+\def\ExplFileDate{2022-07-15}%
 \begingroup
   \def\next{\endgroup}%
   \expandafter\ifx\csname PackageError\endcsname\relax
@@ -32587,12 +32587,12 @@
   }
 \cs_new:Npn \__text_change_case_switch_lower:nnNnnnn #1#2#3#4#5#6#7
   {
-    \__text_change_case_store:n {#5}
+    \__text_change_case_store:n {#6}
     \__text_change_case_loop:nnw {#1} {#2}
   }
 \cs_new:Npn \__text_change_case_switch_upper:nnNnnnn #1#2#3#4#5#6#7
   {
-    \__text_change_case_store:n {#6}
+    \__text_change_case_store:n {#5}
     \__text_change_case_loop:nnw {#1} {#2}
   }
 \cs_new:Npn \__text_change_case_switch_title:nnNnnnn #1#2#3#4#5#6#7
diff --git a/texmf/tex/latex/l3kernel/expl3-generic.tex b/texmf/tex/latex/l3kernel/expl3-generic.tex
index 687d7c58a..b18186473 100644
--- a/texmf/tex/latex/l3kernel/expl3-generic.tex
+++ b/texmf/tex/latex/l3kernel/expl3-generic.tex
@@ -19,7 +19,7 @@
 %% and all files in that bundle must be distributed together.
 %% 
 %% File: expl3.dtx
-\def\ExplFileDate{2022-07-14}%
+\def\ExplFileDate{2022-07-15}%
 \let\ExplLoaderFileDate\ExplFileDate
 \begingroup
   \catcode`\_=11
diff --git a/texmf/tex/latex/l3kernel/expl3.ltx b/texmf/tex/latex/l3kernel/expl3.ltx
index b313818a3..a443e4cef 100644
--- a/texmf/tex/latex/l3kernel/expl3.ltx
+++ b/texmf/tex/latex/l3kernel/expl3.ltx
@@ -19,7 +19,7 @@
 %% and all files in that bundle must be distributed together.
 %% 
 %% File: expl3.dtx
-\def\ExplFileDate{2022-07-14}%
+\def\ExplFileDate{2022-07-15}%
 \let\ExplLoaderFileDate\ExplFileDate
 \begingroup
   \catcode`\_=11
diff --git a/texmf/tex/latex/l3kernel/expl3.sty b/texmf/tex/latex/l3kernel/expl3.sty
index c238bd824..d75eba2b1 100644
--- a/texmf/tex/latex/l3kernel/expl3.sty
+++ b/texmf/tex/latex/l3kernel/expl3.sty
@@ -19,7 +19,7 @@
 %% and all files in that bundle must be distributed together.
 %% 
 %% File: expl3.dtx
-\def\ExplFileDate{2022-07-14}%
+\def\ExplFileDate{2022-07-15}%
 \let\ExplLoaderFileDate\ExplFileDate
 \ProvidesPackage{expl3}
   [%