diff --git a/evtgen-2.0.0.patch b/evtgen-2.0.0.patch
index b5670c4a30c..88902f4e290 100644
--- a/evtgen-2.0.0.patch
+++ b/evtgen-2.0.0.patch
@@ -37,3 +37,42 @@
  
  template <class T>
  class EvtMatrix {
+
+--- a/EvtGenExternal/EvtPythiaEngine.hh
++++ b/EvtGenExternal/EvtPythiaEngine.hh
+@@ -82,7 +82,7 @@
+ 
+     bool _convertPhysCodes, _initialised, _useEvtGenRandom;
+ 
+-    std::unique_ptr<EvtPythiaRandom> _evtgenRandom;
++    std::shared_ptr<EvtPythiaRandom> _evtgenRandom;
+ 
+     std::map<int, int> _addedPDGCodes;
+ };
+
+--- a/src/EvtGenExternal/EvtPythiaEngine.cpp
++++ b/src/EvtGenExternal/EvtPythiaEngine.cpp
+@@ -75,7 +75,7 @@
+     // from EvtGen for Pythia 8.
+     _useEvtGenRandom = useEvtGenRandom;
+ 
+-    _evtgenRandom = std::make_unique<EvtPythiaRandom>();
++    _evtgenRandom = std::make_shared<EvtPythiaRandom>();
+ 
+     _initialised = false;
+ }
+@@ -128,8 +128,13 @@
+ 
+     // Set the random number generator
+     if ( _useEvtGenRandom == true ) {
++#if PYTHIA_VERSION_INTEGER < 8310
+         _genericPythiaGen->setRndmEnginePtr( _evtgenRandom.get() );
+         _aliasPythiaGen->setRndmEnginePtr( _evtgenRandom.get() );
++#else
++        _genericPythiaGen->setRndmEnginePtr( _evtgenRandom );
++        _aliasPythiaGen->setRndmEnginePtr( _evtgenRandom );
++#endif
+     }
+ 
+     _genericPythiaGen->init();
+
diff --git a/pythia8.spec b/pythia8.spec
index c6500fc95f4..9d5c0cc076a 100644
--- a/pythia8.spec
+++ b/pythia8.spec
@@ -1,14 +1,11 @@
-### RPM external pythia8 309
+### RPM external pythia8 311
 
 Source: https://pythia.org/download/pythia83/%{n}%{realversion}.tgz
-# https://gitlab.com/Pythia8/releases/-/issues/289: fix compilation of C++20 code with pythia8
-Patch0: pythia8_309-289
 
 Requires: hepmc hepmc3 lhapdf
 
 %prep
 %setup -q -n %{n}%{realversion}
-%patch0 -p1
 
 ./configure --prefix=%i --enable-shared --with-hepmc2=${HEPMC_ROOT} --with-hepmc3=${HEPMC3_ROOT} --with-lhapdf6=${LHAPDF_ROOT} --enable-mg5mes
 
diff --git a/pythia8_309-289.patch b/pythia8_309-289.patch
deleted file mode 100644
index ec5ba6655bc..00000000000
--- a/pythia8_309-289.patch
+++ /dev/null
@@ -1,31 +0,0 @@
-diff --git a/include/Pythia8/SusyLesHouches.h b/include/Pythia8/SusyLesHouches.h
-index 43d6d621..5a57a968 100644
---- a/include/Pythia8/SusyLesHouches.h
-+++ b/include/Pythia8/SusyLesHouches.h
-@@ -28,7 +28,7 @@ namespace Pythia8 {
-   public:
- 
-     //Constructor.
--    LHblock<T>() : idnow(0), qDRbar(), i(), val() {} ;
-+    LHblock() : idnow(0), qDRbar(), i(), val() {} ;
- 
-     //Does block exist?
-     bool exists() { return int(entry.size()) == 0 ? false : true ; };
-@@ -129,7 +129,7 @@ namespace Pythia8 {
-   template <int size> class LHmatrixBlock {
-   public:
-     //Constructor. Set uninitialized and explicitly zero.
--    LHmatrixBlock<size>() : entry(), qDRbar(), val() {
-+    LHmatrixBlock() : entry(), qDRbar(), val() {
-       initialized=false;
-       for (i=1;i<=size;i++) {
-         for (j=1;j<=size;j++) {
-@@ -208,7 +208,7 @@ namespace Pythia8 {
-   template <int size> class LHtensor3Block {
-   public:
-     //Constructor. Set uninitialized and explicitly zero.
--    LHtensor3Block<size>() : entry(), qDRbar(), val() {
-+    LHtensor3Block() : entry(), qDRbar(), val() {
-       initialized=false;
-       for (i=1;i<=size;i++) {
-         for (j=1;j<=size;j++) {