diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9f893646a..4e47b5732 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,7 +53,7 @@ IF(ASSIMP_HUNTER_ENABLED)
   add_definitions(-DASSIMP_USE_HUNTER)
 ENDIF()
 
-PROJECT( Assimp VERSION 5.0.1 )
+PROJECT(Assimp VERSION 5.1.0)
 
 # All supported options ###############################################
 
diff --git a/Readme.md b/Readme.md
index 09f9af7fa..f4167c9f2 100644
--- a/Readme.md
+++ b/Readme.md
@@ -44,6 +44,7 @@ Take a look into the https://github.com/assimp/assimp/blob/master/Build.md file.
 * [Javascript (Alpha)](https://github.com/makc/assimp2json)
 * [Javascript/Node.js Interface](https://github.com/kovacsv/assimpjs)
 * [Unity 3d Plugin](https://ricardoreis.net/trilib-2/)
+* [Unreal Engine Plugin](https://github.com/irajsb/UE4_Assimp/)
 * [JVM](https://github.com/kotlin-graphics/assimp) Full jvm port (current [status](https://github.com/kotlin-graphics/assimp/wiki/Status))
 * [HAXE-Port](https://github.com/longde123/assimp-haxe) The Assimp-HAXE-port.
 * [Rust](https://github.com/jkvargas/russimp)
diff --git a/code/AssetLib/3MF/D3MFOpcPackage.cpp b/code/AssetLib/3MF/D3MFOpcPackage.cpp
index ac5b91e67..8d51a7417 100644
--- a/code/AssetLib/3MF/D3MFOpcPackage.cpp
+++ b/code/AssetLib/3MF/D3MFOpcPackage.cpp
@@ -149,7 +149,7 @@ D3MFOpcPackage::D3MFOpcPackage(IOSystem *pIOHandler, const std::string &rFile) :
 
             IOStream *fileStream = mZipArchive->Open(file.c_str());
             if (nullptr == fileStream) {
-                ai_assert(fileStream != nullptr);
+                ASSIMP_LOG_ERROR("Filestream is nullptr.");
                 continue;
             }
 
diff --git a/code/AssetLib/STEPParser/STEPFileReader.cpp b/code/AssetLib/STEPParser/STEPFileReader.cpp
index 360277912..09a596aa4 100644
--- a/code/AssetLib/STEPParser/STEPFileReader.cpp
+++ b/code/AssetLib/STEPParser/STEPFileReader.cpp
@@ -325,7 +325,7 @@ std::shared_ptr<const EXPRESS::DataType> EXPRESS::DataType::Parse(const char*& i
                 std::transform(s.begin(),s.end(),s.begin(),&ai_tolower<char> );
                 if (schema->IsKnownToken(s)) {
                     for(cur = t+1;*cur++ != '(';);
-                    const std::shared_ptr<const EXPRESS::DataType> dt = Parse(cur);
+                    std::shared_ptr<const EXPRESS::DataType> dt = Parse(cur);
                     inout = *cur ? cur+1 : cur;
                     return dt;
                 }
diff --git a/include/assimp/anim.h b/include/assimp/anim.h
index dcd054d1e..8a73297a5 100644
--- a/include/assimp/anim.h
+++ b/include/assimp/anim.h
@@ -98,6 +98,7 @@ struct aiVectorKey {
     bool operator<(const aiVectorKey &rhs) const {
         return mTime < rhs.mTime;
     }
+    
     bool operator>(const aiVectorKey &rhs) const {
         return mTime > rhs.mTime;
     }
@@ -131,6 +132,7 @@ struct aiQuatKey {
     bool operator==(const aiQuatKey &rhs) const {
         return rhs.mValue == this->mValue;
     }
+    
     bool operator!=(const aiQuatKey &rhs) const {
         return rhs.mValue != this->mValue;
     }
@@ -139,6 +141,7 @@ struct aiQuatKey {
     bool operator<(const aiQuatKey &rhs) const {
         return mTime < rhs.mTime;
     }
+    
     bool operator>(const aiQuatKey &rhs) const {
         return mTime > rhs.mTime;
     }
diff --git a/include/assimp/mesh.h b/include/assimp/mesh.h
index 8223b3443..225f8556a 100644
--- a/include/assimp/mesh.h
+++ b/include/assimp/mesh.h
@@ -300,6 +300,10 @@ struct aiBone {
     aiBone() AI_NO_EXCEPT
             : mName(),
               mNumWeights(0),
+#ifndef ASSIMP_BUILD_NO_ARMATUREPOPULATE_PROCESS
+              mArmature(nullptr),
+              mNode(nullptr),
+#endif
               mWeights(nullptr),
               mOffsetMatrix() {
         // empty
@@ -309,6 +313,10 @@ struct aiBone {
     aiBone(const aiBone &other) :
             mName(other.mName),
             mNumWeights(other.mNumWeights),
+#ifndef ASSIMP_BUILD_NO_ARMATUREPOPULATE_PROCESS
+              mArmature(nullptr),
+              mNode(nullptr),
+#endif
             mWeights(nullptr),
             mOffsetMatrix(other.mOffsetMatrix) {
         if (other.mWeights && other.mNumWeights) {
diff --git a/test/unit/utVersion.cpp b/test/unit/utVersion.cpp
index 0de6ef39c..6577c7758 100644
--- a/test/unit/utVersion.cpp
+++ b/test/unit/utVersion.cpp
@@ -44,16 +44,16 @@ class utVersion : public ::testing::Test {
 };
 
 TEST_F( utVersion, aiGetLegalStringTest ) {
-    const char *lv( aiGetLegalString() );
+    const char *lv = aiGetLegalString();
     EXPECT_NE( lv, nullptr );
     std::string text( lv );
 
-    size_t pos( text.find( std::string( "2021" ) ) );
+    size_t pos = text.find(std::string("2021"));
     EXPECT_NE( pos, std::string::npos );
 }
 
 TEST_F( utVersion, aiGetVersionMinorTest ) {
-    EXPECT_EQ( aiGetVersionMinor(), 0U );
+    EXPECT_EQ( aiGetVersionMinor(), 1U );
 }
 
 TEST_F( utVersion, aiGetVersionMajorTest ) {