diff --git a/build/pkgs/giac/package-version.txt b/build/pkgs/giac/package-version.txt
index 0940a51b338..ed6339886c2 100644
--- a/build/pkgs/giac/package-version.txt
+++ b/build/pkgs/giac/package-version.txt
@@ -1 +1 @@
-1.4.9.45.p3
+1.4.9.45.p4
diff --git a/build/pkgs/giac/patches/pari_2_11.patch b/build/pkgs/giac/patches/pari_2_11.patch
new file mode 100644
index 00000000000..24142257a34
--- /dev/null
+++ b/build/pkgs/giac/patches/pari_2_11.patch
@@ -0,0 +1,17 @@
+Change test output for PARI 2.11
+
+See https://trac.sagemath.org/ticket/25567
+and https://xcas.univ-grenoble-alpes.fr/forum/viewtopic.php?f=4&t=2102
+
+diff -ru a/check/TP11-sol.cas.out1 b/check/TP11-sol.cas.out1
+--- a/check/TP11-sol.cas.out1	2014-10-21 10:51:48.000000000 +0200
++++ b/check/TP11-sol.cas.out1	2018-08-07 17:04:12.528052773 +0200
+@@ -10,7 +10,7 @@
+ 1073741824000000000000000000061203284109000000000000000000000000008409,
+ 2^3*3*389*733*156904374622257604823879982847602392900751802349981470895277241,
+ "Done",
+-matrix[[2,7,1],[3,2,1],[389,2,1],[733,2,1],[156904374622257604823879982847602392900751802349981470895277241,2,matrix[[2,13,1],[3,3,1],[5,2,1],[7,2,1],[56467,2,1],[6553084925887974620811527,2,matrix[[2,5,1],[19,2,1],[71,2,1],[126823,2,1]]]]]],
++1,
+ 0,
+ [],
+ 1,