diff --git a/build/pkgs/giac/checksums.ini b/build/pkgs/giac/checksums.ini
index f01435d5423..2fb1d3fdf31 100644
--- a/build/pkgs/giac/checksums.ini
+++ b/build/pkgs/giac/checksums.ini
@@ -1,5 +1,5 @@
 tarball=giac-VERSION.tar.bz2
-sha1=b0e81969eb2527964efc802bf35c31d140031571
-md5=f8253082e5dcde5724b4d6f2300d8669
-cksum=3973759340
-upstream_url=https://trac.sagemath.org/raw-attachment/ticket/31562/giac-VERSION.tar.bz2
+sha1=78c15badd19b49b7d111ac204b611a4378ce3d15
+md5=8fbd43a5c60848b6813b7fc8698a0199
+cksum=1923149665
+upstream_url=https://trac.sagemath.org/raw-attachment/ticket/31563/giac-VERSION.tar.bz2
diff --git a/build/pkgs/giac/dependencies b/build/pkgs/giac/dependencies
index 9a60603c750..a051202507e 100644
--- a/build/pkgs/giac/dependencies
+++ b/build/pkgs/giac/dependencies
@@ -1,4 +1,4 @@
-readline libpng $(MP_LIBRARY) mpfr mpfi ntl gsl pari glpk curl cliquer $(findstring libnauty,$(OPTIONAL_INSTALLED_PACKAGES))
+readline libpng $(MP_LIBRARY) mpfr mpfi ntl gsl pari glpk curl cliquer ecm $(findstring libnauty,$(OPTIONAL_INSTALLED_PACKAGES))
 
 ----------
 All lines of this file are ignored except the first.
diff --git a/build/pkgs/giac/package-version.txt b/build/pkgs/giac/package-version.txt
index f490da152c5..ff6a74aad02 100644
--- a/build/pkgs/giac/package-version.txt
+++ b/build/pkgs/giac/package-version.txt
@@ -1 +1 @@
-1.6.0.47p3.p0
+1.9.0.15p0
diff --git a/build/pkgs/giac/patches/0001-src-global.cc-Do-not-send-SIGINT-to-process-1.patch b/build/pkgs/giac/patches/0001-src-global.cc-Do-not-send-SIGINT-to-process-1.patch
index 5ab40921c98..ca33e850d2e 100644
--- a/build/pkgs/giac/patches/0001-src-global.cc-Do-not-send-SIGINT-to-process-1.patch
+++ b/build/pkgs/giac/patches/0001-src-global.cc-Do-not-send-SIGINT-to-process-1.patch
@@ -11,10 +11,10 @@ diff --git a/src/global.cc b/src/global.cc
 index c343aea..87e4575 100755
 --- a/src/global.cc
 +++ b/src/global.cc
-@@ -1978,7 +1978,7 @@ extern "C" void Sleep(unsigned int miliSecond);
+@@ -3762,7 +3762,7 @@ extern "C" void Sleep(unsigned int miliSecond);
    void ctrl_c_signal_handler(int signum){
      ctrl_c=true;
- #if !defined KHICAS && !defined NSPIRE_NEWLIB && !defined WIN32 && !defined BESTA_OS && !defined NSPIRE && !defined FXCG && !defined POCKETCAS
+ #if !defined KHICAS && !defined NSPIRE_NEWLIB && !defined WIN32 && !defined BESTA_OS && !defined NSPIRE && !defined FXCG && !defined POCKETCAS && !defined __MINGW_H
 -    if (child_id)
 +    if (child_id && child_id != 1)
        kill(child_id,SIGINT);
diff --git a/build/pkgs/giac/patches/autotools/0001-configure.ac-Do-not-link-to-libintl-if-USE_NLS-is-no.patch b/build/pkgs/giac/patches/autotools/0001-configure.ac-Do-not-link-to-libintl-if-USE_NLS-is-no.patch
deleted file mode 100644
index 8d838f8bd32..00000000000
--- a/build/pkgs/giac/patches/autotools/0001-configure.ac-Do-not-link-to-libintl-if-USE_NLS-is-no.patch
+++ /dev/null
@@ -1,30 +0,0 @@
-From 2285c11b3cfebc31aa2c032015c76820e3a62030 Mon Sep 17 00:00:00 2001
-From: Matthias Koeppe <mkoeppe@math.ucdavis.edu>
-Date: Thu, 25 Mar 2021 18:00:38 -0700
-Subject: [PATCH] configure.ac: Do not link to libintl if USE_NLS is no
-
----
- configure.ac | 7 ++++++-
- 1 file changed, 6 insertions(+), 1 deletion(-)
-
-diff --git a/configure.ac b/configure.ac
-index bfa767d..43c6ff9 100644
---- a/configure.ac
-+++ b/configure.ac
-@@ -464,7 +464,12 @@ AC_CHECK_FUNCS(system, , AC_DEFINE(HAVE_NO_SYSTEM, 1, [Set if system() function
- ALL_LINGUAS="es fr el pt it en zh de"
- AM_GNU_GETTEXT
- AM_GNU_GETTEXT_VERSION([0.14.5])
--AC_CHECK_LIB(intl, main)
-+AS_VAR_IF([USE_NLS], [yes],
-+  dnl Whether this is needed at all, after all the AM_GNU_GETTEXT macros
-+  dnl were run, is unknown.  But at least we should disable it if NLS
-+  dnl is disabled.
-+  AC_CHECK_LIB(intl, main)
-+])dnl
- dnl auto-check will work if the function checked is alone in a file
- dnl and independant from the whole micropython library
- dnl otherwise it will fail because it depends on giac
--- 
-2.28.0
-
diff --git a/build/pkgs/giac/patches/autotools/giac-1.5.0.87-gsl_lapack.patch b/build/pkgs/giac/patches/autotools/giac-1.5.0.87-gsl_lapack.patch
index 5b7a9d3a2ad..8a023d3b6ba 100644
--- a/build/pkgs/giac/patches/autotools/giac-1.5.0.87-gsl_lapack.patch
+++ b/build/pkgs/giac/patches/autotools/giac-1.5.0.87-gsl_lapack.patch
@@ -73,10 +73,10 @@ index b5dd325..d45b553 100644
 --- a/src/Makefile.am
 +++ b/src/Makefile.am
 @@ -14,6 +14,8 @@ libgiac_la_SOURCES = input_lexer.ll sym2poly.cc gausspol.cc threaded.cc \
-   help.cc  lpsolve.cc optimization.cc signalprocessing.cc \
-   graphe.cc graphtheory.cc nautywrapper.c markup.cc kdisplay.cc kadd.cc # Ugh..
+   caseval.c cutils.c graphic.c libbf.c libregexp.c libunicode.c \
+   qjsgiac.c quickjs.c quickjs-libc.c js.c
  
--libgiac_la_LIBADD = $(NTL_LIBS) $(COCOA_LIBS) $(PARI_LIBS) $(GSL_LIBS)
+-libgiac_la_LIBADD = $(NTL_LIBS) $(COCOA_LIBS) $(PARI_LIBS) $(GSL_LIBS) 
 +libgiac_la_LIBADD = $(NTL_LIBS) $(COCOA_LIBS) $(PARI_LIBS) $(GSL_LIBS) $(LAPACK_LIBS) $(BLAS_LIBS)
 +
 +AM_LDFLAGS = -no-undefined
diff --git a/build/pkgs/giac/patches/macos-ifactor.patch b/build/pkgs/giac/patches/macos-ifactor.patch
index 34e84dda7ef..e8c4deb53b3 100644
--- a/build/pkgs/giac/patches/macos-ifactor.patch
+++ b/build/pkgs/giac/patches/macos-ifactor.patch
@@ -1,12 +1,11 @@
 --- a/src/ifactor.cc	2014-10-11 16:29:01.000000000 +0200
 +++ b/src/ifactor.cc	2014-10-11 16:29:28.000000000 +0200
-@@ -4007,7 +4007,7 @@
+@@ -4034,7 +4034,4 @@
  #endif
  #ifdef HAVE_LIBPARI
- #ifdef __APPLE__
--    return vecteur(1,gensizeerr(gettext("(Mac OS) Large number, you can try pari(); pari_factor(")+n0.print(contextptr)+")"));
-+    //    return vecteur(1,gensizeerr(gettext("(Mac OS) Large number, you can try pari(); pari_factor(")+n0.print(contextptr)+")"));
- #endif
-     gen g(pari_ifactor(n0),contextptr); 
-     if (g.type==_VECT){
-
+     if (ifactor_pari){
+-#ifdef __APPLE__
+-      return vecteur(1,gensizeerr(gettext("(Mac OS) Large number, you can try pari(); pari_factor(")+n0.print(contextptr)+")"));
+-#endif
+       gen g(pari_ifactor(n0),contextptr); 
+       if (g.type==_VECT){
diff --git a/build/pkgs/giac/spkg-install.in b/build/pkgs/giac/spkg-install.in
index ca30dc6ea62..c20671a7b88 100644
--- a/build/pkgs/giac/spkg-install.in
+++ b/build/pkgs/giac/spkg-install.in
@@ -16,6 +16,9 @@ if [ `uname -m` = "ppc64" ]; then
     CPPFLAGS="-Dx86_64 $CPPFLAGS"
 fi
 
+# #31563: Kick the can down the road
+CPPFLAGS="-DUSE_OBJET_BIDON=1 $CPPFLAGS"
+
 # Using pari in a C++17 file with "using namespace std doesn't
 # work due to a conflict between std::rank and pari's rank
 # -std=c++17 is in the default flags on conda;
@@ -53,7 +56,7 @@ if [ "$UNAME" = "CYGWIN" ]; then
     export ac_cv_header_nauty_naututil_h=no
 fi
 
-sdh_configure --disable-gui --disable-ao "$DISABLENLS" --enable-png=no --disable-samplerate --disable-static --disable-micropy
+sdh_configure --disable-gui --disable-ao "$DISABLENLS" --enable-png=no --disable-samplerate --disable-static --disable-micropy --disable-quickjs
 
 #############################################################
 #   Build
diff --git a/build/pkgs/giac/spkg-src b/build/pkgs/giac/spkg-src
index 064c7a092e0..830c4a47c65 100755
--- a/build/pkgs/giac/spkg-src
+++ b/build/pkgs/giac/spkg-src
@@ -13,9 +13,9 @@ fi
 # Exit on failure
 set -e
 
-VERSION="1.6.0"
-VERSIONREV="47"
-PATCHSUFFIX="p3"
+VERSION="1.9.0"
+VERSIONREV="15"
+PATCHSUFFIX="p0"
 
 # The upstream tarball name is: giac"$SOURCEORIG".tar.gz
 SOURCEORIG=_"$VERSION"-"$VERSIONREV"
@@ -49,6 +49,9 @@ mv giac-"$VERSION" src
 # remove unnecessary files
 rm -rf src/doc/pari/*.html
 
+rm -f src/doc/*.wasm src/doc/*.js
+sed -E -i.bak '/XCASHTML/s/[^ ]*[.](wasm|js)//g' src/doc/Makefile.am
+
 # removing french html doc, but keep keywords, and working makefiles.
 # NB: the french html doc is huge and not GPL.
 # it is freely redistributable only for non commercial purposes.