diff --git a/lib/doc/Math.lyx b/lib/doc/Math.lyx
index 1fe262f2e3..11e0a443b8 100644
--- a/lib/doc/Math.lyx
+++ b/lib/doc/Math.lyx
@@ -1,4 +1,4 @@
-#LyX 2.4 created this file. For more info see http://www.lyx.org/
+#LyX 2.3 created this file. For more info see http://www.lyx.org/
 \lyxformat 544
 \begin_document
 \begin_header
@@ -275,7 +275,7 @@ author: Uwe Stöhr
 
 
 \family sans
-Version 2.2.x
+Version 2.3.x
 \end_layout
 
 \begin_layout Standard
diff --git a/lib/doc/de/Math.lyx b/lib/doc/de/Math.lyx
index 84f635cb65..43606c1006 100644
--- a/lib/doc/de/Math.lyx
+++ b/lib/doc/de/Math.lyx
@@ -1,4 +1,4 @@
-#LyX 2.4 created this file. For more info see http://www.lyx.org/
+#LyX 2.3 created this file. For more info see http://www.lyx.org/
 \lyxformat 544
 \begin_document
 \begin_header
@@ -286,7 +286,7 @@ Verfasser: Uwe Stöhr
 
 
 \family sans
-Version 2.2.x
+Version 2.3.x
 \end_layout
 
 \begin_layout Standard
diff --git a/lib/doc/es/Math.lyx b/lib/doc/es/Math.lyx
index aa9fc591c1..e29b705236 100644
--- a/lib/doc/es/Math.lyx
+++ b/lib/doc/es/Math.lyx
@@ -1,4 +1,4 @@
-#LyX 2.4 created this file. For more info see http://www.lyx.org/
+#LyX 2.3 created this file. For more info see http://www.lyx.org/
 \lyxformat 544
 \begin_document
 \begin_header
@@ -274,7 +274,7 @@ autor: Uwe Stöhr, traducción: Ignacio García
 \begin_inset Newline newline
 \end_inset
 
-Versión 2.2.x
+Versión 2.3.x
 \end_layout
 
 \begin_layout Standard
diff --git a/lib/doc/fr/Math.lyx b/lib/doc/fr/Math.lyx
index 79266f97e8..ca2d124d0f 100644
--- a/lib/doc/fr/Math.lyx
+++ b/lib/doc/fr/Math.lyx
@@ -1,4 +1,4 @@
-#LyX 2.4 created this file. For more info see http://www.lyx.org/
+#LyX 2.3 created this file. For more info see http://www.lyx.org/
 \lyxformat 544
 \begin_document
 \begin_header
@@ -311,7 +311,7 @@ Août 2017 : revue pour 2.3 (JPC)
 
 
 \family sans
-Version 2.2.x
+Version 2.3.x
 \end_layout
 
 \begin_layout Standard