diff --git a/isl-0.23.tar.xz b/isl-0.23.tar.xz
deleted file mode 100644
index 4b8ca8f..0000000
--- a/isl-0.23.tar.xz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:5efc53efaef151301f4e7dde3856b66812d8153dede24fab17673f801c8698f2
-size 1729656
diff --git a/isl-0.24.tar.xz b/isl-0.24.tar.xz
new file mode 100644
index 0000000..a6e3da1
--- /dev/null
+++ b/isl-0.24.tar.xz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:043105cc544f416b48736fff8caf077fb0663a717d06b1113f16e391ac99ebad
+size 1930956
diff --git a/isl.changes b/isl.changes
index e564fea..2175115 100644
--- a/isl.changes
+++ b/isl.changes
@@ -1,3 +1,11 @@
+-------------------------------------------------------------------
+Sun May  9 14:05:41 UTC 2021 - Dirk Müller <dmueller@suse.com>
+
+- update to 0.24:
+  - improved (C++) bindings (inherit methods, renamed exports)
+  - initial templated C++ bindings
+  - detect bounds on constant polynomials as tight 
+
 -------------------------------------------------------------------
 Mon Jan 25 13:53:25 UTC 2021 - Andreas Schwab <schwab@suse.de>
 
diff --git a/isl.spec b/isl.spec
index e2b6a8e..0979a19 100644
--- a/isl.spec
+++ b/isl.spec
@@ -18,7 +18,7 @@
 
 %define islsover 23
 Name:           isl
-Version:        0.23
+Version:        0.24
 Release:        0
 Summary:        Integer Set Library
 License:        MIT
@@ -56,7 +56,7 @@ bounded by linear constraints.
 %setup -q
 
 %build
-export CFLAGS_FOR_BUILD="%optflags"
+export CFLAGS_FOR_BUILD="%{optflags}"
 %configure --disable-static
 %make_build