diff --git a/runtime/CSharp/runtime/CSharp/Antlr4.Runtime/Properties/AssemblyInfo.cs b/runtime/CSharp/runtime/CSharp/Antlr4.Runtime/Properties/AssemblyInfo.cs
index 3bb88e173..580d104e3 100644
--- a/runtime/CSharp/runtime/CSharp/Antlr4.Runtime/Properties/AssemblyInfo.cs
+++ b/runtime/CSharp/runtime/CSharp/Antlr4.Runtime/Properties/AssemblyInfo.cs
@@ -42,8 +42,8 @@ using System.Runtime.InteropServices;
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("4.5.3.0")]
+[assembly: AssemblyVersion("4.6.0")]
 #if !COMPACT
-[assembly: AssemblyFileVersion("4.5.3.0")]
-[assembly: AssemblyInformationalVersion("4.5.3.0")]
+[assembly: AssemblyFileVersion("4.6.0")]
+[assembly: AssemblyInformationalVersion("4.6.0")]
 #endif
diff --git a/runtime/Cpp/VERSION b/runtime/Cpp/VERSION
index 0ed2bfe96..b3d791d75 100644
--- a/runtime/Cpp/VERSION
+++ b/runtime/Cpp/VERSION
@@ -1 +1 @@
-4.5.4
+4.6
diff --git a/runtime/Cpp/cmake/ExternalAntlr4Cpp.cmake b/runtime/Cpp/cmake/ExternalAntlr4Cpp.cmake
index 1cb579a4d..02191444a 100644
--- a/runtime/Cpp/cmake/ExternalAntlr4Cpp.cmake
+++ b/runtime/Cpp/cmake/ExternalAntlr4Cpp.cmake
@@ -65,8 +65,8 @@ set(ANTLR4CPP_EXTERNAL_ROOT ${CMAKE_BINARY_DIR}/externals/antlr4cpp)
 
 # external repository
 # GIT_REPOSITORY     https://github.com/antlr/antlr4.git
-set(ANTLR4CPP_EXTERNAL_REPO "https://github.com/DanMcLaughlin/antlr4.git")
-set(ANTLR4CPP_EXTERNAL_TAG  "v4.5.4")
+set(ANTLR4CPP_EXTERNAL_REPO "https://github.com/antlr/antlr4.git")
+set(ANTLR4CPP_EXTERNAL_TAG  "4.6")
 
 if(NOT EXISTS "${ANTLR4CPP_JAR_LOCATION}")
   message(FATAL_ERROR "Unable to find antlr tool. ANTLR4CPP_JAR_LOCATION:${ANTLR4CPP_JAR_LOCATION}")
diff --git a/runtime/Cpp/runtime/src/RuntimeMetaData.cpp b/runtime/Cpp/runtime/src/RuntimeMetaData.cpp
index 15f940e90..f5bdacac5 100755
--- a/runtime/Cpp/runtime/src/RuntimeMetaData.cpp
+++ b/runtime/Cpp/runtime/src/RuntimeMetaData.cpp
@@ -7,7 +7,7 @@
 
 using namespace antlr4;
 
-const std::string RuntimeMetaData::VERSION = "4.5.4";
+const std::string RuntimeMetaData::VERSION = "4.6";
 
 std::string RuntimeMetaData::getRuntimeVersion() {
   return VERSION;