diff --git a/programming/library/z3/actions.py b/programming/library/z3/actions.py
index 9598d2adf5..113400c087 100644
--- a/programming/library/z3/actions.py
+++ b/programming/library/z3/actions.py
@@ -31,5 +31,5 @@ def build():
 def install():
 	shelltools.system("DESTDIR=%s ninja -C build install" % get.installDIR())
 
-	pisitools.dodoc("LICENSE.txt", "README*", "RELEASE_NOTES")
+	pisitools.dodoc("RELEASE_NOTES.md")
 
diff --git a/programming/library/z3/files/616fc2cbd5522137b78097c247feb04e266ff780.patch b/programming/library/z3/files/616fc2cbd5522137b78097c247feb04e266ff780.patch
new file mode 100644
index 0000000000..46f25dd78e
--- /dev/null
+++ b/programming/library/z3/files/616fc2cbd5522137b78097c247feb04e266ff780.patch
@@ -0,0 +1,23 @@
+From 616fc2cbd5522137b78097c247feb04e266ff780 Mon Sep 17 00:00:00 2001
+From: Nikolaj Bjorner <nbjorner@microsoft.com>
+Date: Sun, 4 Sep 2022 16:22:11 -0700
+Subject: [PATCH] fix #6314
+
+Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
+---
+ src/solver/assertions/asserted_formulas.cpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/solver/assertions/asserted_formulas.cpp b/src/solver/assertions/asserted_formulas.cpp
+index 5780ef227e..5dec90ba7a 100644
+--- a/src/solver/assertions/asserted_formulas.cpp
++++ b/src/solver/assertions/asserted_formulas.cpp
+@@ -732,7 +732,7 @@ void asserted_formulas::bv_size_reduce_fn::simplify(justified_expr const& j, exp
+     auto check_reduce = [&](expr* a, expr* b) {
+         if (bv.is_extract(a, lo, hi, x) && lo > 0 && hi + 1 == bv.get_bv_size(x) && bv.is_numeral(b, r) && r == 0) {
+             // insert x -> x[0,lo-1] ++ n into sub
+-            new_term = bv.mk_concat(bv.mk_extract(lo - 1, 0, x), b);
++            new_term = bv.mk_concat(b, bv.mk_extract(lo - 1, 0, x));
+             m_sub.insert(x, new_term);
+             n = j.get_fml();
+             return true;
diff --git a/programming/library/z3/pspec.xml b/programming/library/z3/pspec.xml
index 440577f900..2321c9f2d8 100644
--- a/programming/library/z3/pspec.xml
+++ b/programming/library/z3/pspec.xml
@@ -13,8 +13,8 @@
 		<PartOf>programming.library</PartOf>
 		<Summary>The Z3 Theorem Prover.</Summary>
 		<Description>Z3 is a theorem prover from Microsoft Research.</Description>
-		<Archive sha1sum="376d377d1e1c4e0d7be112987a1b65ff6b21563c" type="targz">
-			https://github.com/Z3Prover/z3/archive/refs/tags/z3-4.8.17.tar.gz
+		<Archive sha1sum="e70730f338cd392d26136b03e92385b37f3447ec" type="targz">
+			https://github.com/Z3Prover/z3/archive/refs/tags/z3-4.11.2.tar.gz
 		</Archive>
 		<BuildDependencies>
 			<Dependency>cmake</Dependency>
@@ -23,6 +23,9 @@
 			<Dependency>python3-devel</Dependency>
 			<Dependency>python3-setuptools</Dependency>
 		</BuildDependencies>
+		<Patches>
+			<Patch level="1">616fc2cbd5522137b78097c247feb04e266ff780.patch</Patch>
+		</Patches>
 	</Source>
 
 	<Package>
@@ -64,6 +67,13 @@
 	</Package>
 
 	<History>
+		<Update release="6">
+			<Date>2022-09-05</Date>
+			<Version>4.11.2</Version>
+			<Comment>Version bump.</Comment>
+			<Name>fury</Name>
+			<Email>uglyside@yandex.ru</Email>
+		</Update>
 		<Update release="5">
 			<Date>2022-05-28</Date>
 			<Version>4.8.17</Version>