diff --git a/lib/latexfonts b/lib/latexfonts
index 33ae9da299..9b75744b68 100644
--- a/lib/latexfonts
+++ b/lib/latexfonts
@@ -202,14 +202,6 @@ Font IBMPlexSerifLight
 	MoreOptions      1
 EndFont
 
-Font IBMPlexSerifSemibold
-	GuiName          "IBM Plex Serif (Semibold)"
-	Family           rm
-	Package          plex-serif
-	PackageOptions   semibold
-	MoreOptions      1
-EndFont
-
 Font ADOBESourceSerifPro
 	GuiName		 "Adobe Source Serif Pro"
 	Family		 rm
@@ -839,15 +831,6 @@ Font IBMPlexSansLight
 	MoreOptions      1
 EndFont
 
-Font IBMPlexSansSemibold
-	GuiName          "IBM Plex Sans (Semibold)"
-	Family           sf
-	Package          plex-sans
-	PackageOptions   semibold
-	ScaleOption      scale=$$val
-	MoreOptions      1
-EndFont
-
 Font ADOBESourceSansPro
 	GuiName		 "Adobe Source Sans Pro"
 	Family		 sf
@@ -1103,15 +1086,6 @@ Font IBMPlexMonoLight
 	MoreOptions      1
 EndFont
 
-Font IBMPlexMonoSemibold
-	GuiName          "IBM Plex Mono (Semibold)"
-	Family           tt
-	Package          plex-mono
-	ScaleOption      scale=$$val
-	PackageOptions   semibold
-	MoreOptions      1
-EndFont
-
 Font ADOBESourceCodePro
 	GuiName		 "Adobe Source Code Pro"
 	Family		 tt
diff --git a/lib/lyx2lyx/lyx_2_4.py b/lib/lyx2lyx/lyx_2_4.py
index d7831dc5b6..61066ab8cc 100644
--- a/lib/lyx2lyx/lyx_2_4.py
+++ b/lib/lyx2lyx/lyx_2_4.py
@@ -2956,6 +2956,97 @@ def revert_FiraFont(document):
             add_preamble_fonts(document, fontmap)
 
 
+def convert_Semibolds(document):
+    " Move semibold options to extraopts "
+
+    NonTeXFonts = False
+    i = find_token(document.header, '\\use_non_tex_fonts', 0)
+    if i == -1:
+        document.warning("Malformed LyX document: Missing \\use_non_tex_fonts.")
+    else:
+        NonTeXFonts = str2bool(get_value(document.header, "\\use_non_tex_fonts", i))
+
+    sbfonts = ["IBMPlexSerifSemibold", "IBMPlexSansSemibold", "IBMPlexMonoSemibold" ]
+
+    i = find_token(document.header, "\\font_roman", 0)
+    if i == -1:
+        document.warning("Malformed LyX document: Missing \\font_roman.")
+    else:
+        # We need to use this regex since split() does not handle quote protection
+        romanfont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
+        roman = romanfont[1].strip('"')
+        if roman == "IBMPlexSerifSemibold":
+            romanfont[1] = '"IBMPlexSerif"'
+            document.header[i] = " ".join(romanfont)
+
+            if NonTeXFonts == False:
+                regexp = re.compile(r'(\\font_roman_opts)')
+                x = find_re(document.header, regexp, 0)
+                if x == -1:
+                    # Sensible place to insert tag
+                    fo = find_token(document.header, "\\font_sf_scale")
+                    if fo == -1:
+                        document.warning("Malformed LyX document! Missing \\font_sf_scale")
+                    else:
+                        document.header.insert(fo, "\\font_roman_opts \"semibold\"")
+                else:
+                    # We need to use this regex since split() does not handle quote protection
+                    romanopts = re.findall(r'[^"\s]\S*|".+?"', document.header[x])
+                    document.header[x] = "\\font_roman_opts \"semibold, " + romanopts[1].strip('"') + "\""
+
+    i = find_token(document.header, "\\font_sans", 0)
+    if i == -1:
+        document.warning("Malformed LyX document: Missing \\font_sans.")
+    else:
+        # We need to use this regex since split() does not handle quote protection
+        sffont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
+        sf = sffont[1].strip('"')
+        if sf == "IBMPlexSansSemibold":
+            sffont[1] = '"IBMPlexSans"'
+            document.header[i] = " ".join(sffont)
+
+            if NonTeXFonts == False:
+                regexp = re.compile(r'(\\font_sans_opts)')
+                x = find_re(document.header, regexp, 0)
+                if x == -1:
+                    # Sensible place to insert tag
+                    fo = find_token(document.header, "\\font_sf_scale")
+                    if fo == -1:
+                        document.warning("Malformed LyX document! Missing \\font_sf_scale")
+                    else:
+                        document.header.insert(fo, "\\font_sans_opts \"semibold\"")
+                else:
+                    # We need to use this regex since split() does not handle quote protection
+                    sfopts = re.findall(r'[^"\s]\S*|".+?"', document.header[x])
+                    document.header[x] = "\\font_sans_opts \"semibold, " + sfopts[1].strip('"') + "\""
+
+    i = find_token(document.header, "\\font_typewriter", 0)
+    if i == -1:
+        document.warning("Malformed LyX document: Missing \\font_typewriter.")
+    else:
+        # We need to use this regex since split() does not handle quote protection
+        ttfont = re.findall(r'[^"\s]\S*|".+?"', document.header[i])
+        tt = ttfont[1].strip('"')
+        if tt == "IBMPlexMonoSemibold":
+            ttfont[1] = '"IBMPlexMono"'
+            document.header[i] = " ".join(ttfont)
+
+            if NonTeXFonts == False:
+                regexp = re.compile(r'(\\font_typewriter_opts)')
+                x = find_re(document.header, regexp, 0)
+                if x == -1:
+                    # Sensible place to insert tag
+                    fo = find_token(document.header, "\\font_tt_scale")
+                    if fo == -1:
+                        document.warning("Malformed LyX document! Missing \\font_tt_scale")
+                    else:
+                        document.header.insert(fo, "\\font_typewriter_opts \"semibold\"")
+                else:
+                    # We need to use this regex since split() does not handle quote protection
+                    ttopts = re.findall(r'[^"\s]\S*|".+?"', document.header[x])
+                    document.header[x] = "\\font_typewriter_opts \"semibold, " + sfopts[1].strip('"') + "\""
+
+
 ##
 # Conversion hub
 #
@@ -3000,7 +3091,7 @@ convert = [
            [580, []],
            [581, [convert_osf]],
            [582, [convert_AdobeFonts,convert_latexFonts,convert_notoFonts,convert_CantarellFont,convert_FiraFont]],# old font re-converterted due to extra options
-           [583, [convert_ChivoFont]],
+           [583, [convert_ChivoFont,convert_Semibolds]],
           ]
 
 revert =  [[582, [revert_ChivoFont]],
diff --git a/src/tex2lyx/Preamble.cpp b/src/tex2lyx/Preamble.cpp
index ea76e5f8c5..2ab24e11c1 100644
--- a/src/tex2lyx/Preamble.cpp
+++ b/src/tex2lyx/Preamble.cpp
@@ -1019,10 +1019,6 @@ void Preamble::handle_package(Parser &p, string const & name,
 				h_font_roman[0] = "IBMPlexSerifLight";
 				continue;
 			}
-			if (opt == "semibold") {
-				h_font_roman[0] = "IBMPlexSerifSemibold";
-				continue;
-			}
 			if (!xopts.empty())
 				xopts += ", ";
 			xopts += opt;
@@ -1228,10 +1224,6 @@ void Preamble::handle_package(Parser &p, string const & name,
 				h_font_sans[0] = "IBMPlexSansLight";
 				continue;
 			}
-			if (opt == "semibold") {
-				h_font_sans[0] = "IBMPlexSansSemibold";
-				continue;
-			}
 			if (!xopts.empty())
 				xopts += ", ";
 			xopts += opt;
@@ -1353,10 +1345,6 @@ void Preamble::handle_package(Parser &p, string const & name,
 				h_font_typewriter[0] = "IBMPlexMonoLight";
 				continue;
 			}
-			if (opt == "semibold"){
-				h_font_typewriter[0] = "IBMPlexMonoSemibold";
-				continue;
-			}
 			if (!xopts.empty())
 				xopts += ", ";
 			xopts += opt;