diff --git a/V4.4.tar.gz b/V4.4.tar.gz
deleted file mode 100644
index 2693ebe..0000000
--- a/V4.4.tar.gz
+++ /dev/null
@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:6560445a3f6d359c0d1c3a01eb3ec3f3174b3554bf33865c913082030e72c176
-size 45745607
diff --git a/V4.5.tar.gz b/V4.5.tar.gz
new file mode 100644
index 0000000..018ac7d
--- /dev/null
+++ b/V4.5.tar.gz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:77e98f1d41ed7d0eee8e983814bcb3f1a1b2b6100420ccd432bd2e796f0bc48a
+size 45802758
diff --git a/bliss077.patch b/bliss077.patch
deleted file mode 100644
index c98f6c0..0000000
--- a/bliss077.patch
+++ /dev/null
@@ -1,37 +0,0 @@
-References: https://polymake.org/downloads/bliss077.patch
-
-polymake 4.4 is a bit older than bliss 0.77 and so needs a patch to
-get the compilation between the two going.
----
- bundled/bliss/apps/graph/src/GraphIso.cc |   10 ++++++++++
- 1 file changed, 10 insertions(+)
-
-Index: polymake-4.4/bundled/bliss/apps/graph/src/GraphIso.cc
-===================================================================
---- polymake-4.4.orig/bundled/bliss/apps/graph/src/GraphIso.cc
-+++ polymake-4.4/bundled/bliss/apps/graph/src/GraphIso.cc
-@@ -18,6 +18,9 @@
- #include <cstring>
- #include <cstddef> // needed for gcc 4.9, see http://gcc.gnu.org/gcc-4.9/porting_to.html
- #include <bliss/graph.hh>
-+#if BLISS_VERSION_MAJOR > 0 || BLISS_VERSION_MINOR >= 76
-+#include <bliss/digraph.hh>
-+#endif
- #include "polymake/graph/GraphIso.h"
- #include "polymake/permutations.h"
- 
-@@ -129,7 +132,14 @@ void GraphIso::finalize(bool gather_auto
-    const unsigned int *perm;
-    if (gather_automorphisms) {
-       n_autom = 0;
-+#if BLISS_VERSION_MAJOR > 0 || BLISS_VERSION_MINOR >= 76
-+      auto aut_fun = [this](unsigned int nn, const unsigned int* aut) {
-+         impl::store_autom(this, nn, aut);
-+      };
-+      perm = p_impl->src_graph->canonical_form(stats, aut_fun);
-+#else
-       perm = p_impl->src_graph->canonical_form(stats, &impl::store_autom, this);
-+#endif
-    } else {
-       perm = p_impl->src_graph->canonical_form(stats, nullptr, nullptr);
-    }
diff --git a/polymake.changes b/polymake.changes
index 56ee8fc..6d7ba87 100644
--- a/polymake.changes
+++ b/polymake.changes
@@ -1,3 +1,13 @@
+-------------------------------------------------------------------
+Tue Nov  2 20:48:45 UTC 2021 - Jan Engelhardt <jengelh@inai.de>
+
+- Update to release 4.5
+  * Extend flint interface for computations over ZZ/nZZ.
+  * Fixed bug giving wrong signs of determinant occasionally
+  * New property type DoublyConnectedEdgeList used for Conway
+    notation and hyperbolic surfaces.
+- Drop bliss077.patch (merged)
+
 -------------------------------------------------------------------
 Tue Jun 22 15:59:55 UTC 2021 - Jan Engelhardt <jengelh@inai.de>
 
diff --git a/polymake.spec b/polymake.spec
index a103e19..d8538f0 100644
--- a/polymake.spec
+++ b/polymake.spec
@@ -16,9 +16,9 @@
 #
 
 
-%define lname   libpolymake4_4
+%define lname   libpolymake4_5
 Name:           polymake
-Version:        4.4
+Version:        4.5
 Release:        0
 Summary:        Application for studying combinatorics and geometry of convex polytopes
 License:        GPL-2.0-or-later
@@ -26,7 +26,6 @@ Group:          Productivity/Scientific/Math
 URL:            https://polymake.org/
 
 Source:         https://github.com/polymake/polymake/archive/V%version.tar.gz
-Patch1:         bliss077.patch
 Patch2:         sympol-system.patch
 BuildRequires:  bliss-devel
 BuildRequires:  cddlib-devel
@@ -72,6 +71,7 @@ objects, and other objects.
 %package devel
 Summary:        Development files for the polymake library
 Group:          Development/Libraries/C and C++
+Requires:       %lname = %version-%release
 
 %description devel
 polymake is a tool to study the combinatorics and the geometry of