diff --git a/doc/Doxyfile b/doc/Doxyfile
index c106140a..2c44d006 100644
--- a/doc/Doxyfile
+++ b/doc/Doxyfile
@@ -1,4 +1,4 @@
-# Doxyfile 1.8.16
+# Doxyfile 1.8.19
 
 #---------------------------------------------------------------------------
 # Project related configuration options
@@ -23,6 +23,7 @@ STRIP_FROM_PATH        =
 STRIP_FROM_INC_PATH    =
 SHORT_NAMES            = NO
 JAVADOC_AUTOBRIEF      = NO
+JAVADOC_BANNER         = NO
 QT_AUTOBRIEF           = NO
 MULTILINE_CPP_IS_BRIEF = NO
 INHERIT_DOCS           = YES
@@ -33,7 +34,6 @@ ALIASES                = "complexity=@par Complexity^^" \
                          "requirement=@par Requirements^^" \
                          "exceptionsafety=@par Exception safety^^" \
                          "iterators=@par Iterator validity^^"
-TCL_SUBST              =
 OPTIMIZE_OUTPUT_FOR_C  = NO
 OPTIMIZE_OUTPUT_JAVA   = NO
 OPTIMIZE_FOR_FORTRAN   = NO
@@ -59,6 +59,7 @@ LOOKUP_CACHE_SIZE      = 0
 #---------------------------------------------------------------------------
 EXTRACT_ALL            = YES
 EXTRACT_PRIVATE        = NO
+EXTRACT_PRIV_VIRTUAL   = NO
 EXTRACT_PACKAGE        = YES
 EXTRACT_STATIC         = YES
 EXTRACT_LOCAL_CLASSES  = YES
@@ -140,9 +141,6 @@ REFERENCES_LINK_SOURCE = NO
 SOURCE_TOOLTIPS        = YES
 USE_HTAGS              = NO
 VERBATIM_HEADERS       = NO
-CLANG_ASSISTED_PARSING = YES
-CLANG_OPTIONS          = -std=c++11
-CLANG_DATABASE_PATH    =
 #---------------------------------------------------------------------------
 # Configuration options related to the alphabetical class index
 #---------------------------------------------------------------------------
@@ -194,8 +192,10 @@ GENERATE_TREEVIEW      = NO
 ENUM_VALUES_PER_LINE   = 4
 TREEVIEW_WIDTH         = 250
 EXT_LINKS_IN_WINDOW    = NO
+HTML_FORMULA_FORMAT    = png
 FORMULA_FONTSIZE       = 10
 FORMULA_TRANSPARENT    = YES
+FORMULA_MACROFILE      =
 USE_MATHJAX            = NO
 MATHJAX_FORMAT         = HTML-CSS
 MATHJAX_RELPATH        = http://cdn.mathjax.org/mathjax/latest
@@ -293,12 +293,10 @@ GENERATE_TAGFILE       = html/nlohmann_json.tag
 ALLEXTERNALS           = NO
 EXTERNAL_GROUPS        = YES
 EXTERNAL_PAGES         = YES
-PERL_PATH              = /usr/bin/perl
 #---------------------------------------------------------------------------
 # Configuration options related to the dot tool
 #---------------------------------------------------------------------------
 CLASS_DIAGRAMS         = NO
-MSCGEN_PATH            =
 DIA_PATH               =
 HIDE_UNDOC_RELATIONS   = YES
 HAVE_DOT               = YES