diff --git a/ports/antlr4/CONTROL b/ports/antlr4/CONTROL
index e483545287..64287d02b9 100644
--- a/ports/antlr4/CONTROL
+++ b/ports/antlr4/CONTROL
@@ -1,6 +1,5 @@
 Source: antlr4
-Version: 4.8
-Port-Version: 1
+Version: 4.9.1
 Homepage: https://www.antlr.org
 Description: ANother Tool for Language Recognition
 Build-Depends: libuuid (!uwp&!windows&!osx)
diff --git a/ports/antlr4/fix_utfcpp_dependency.patch b/ports/antlr4/fix_utfcpp_dependency.patch
new file mode 100644
index 0000000000..629e12f38e
--- /dev/null
+++ b/ports/antlr4/fix_utfcpp_dependency.patch
@@ -0,0 +1,45 @@
+diff --git a/runtime/Cpp/runtime/CMakeLists.txt b/runtime/Cpp/runtime/CMakeLists.txt
+index a8503bb61..e7b01b7cb 100644
+--- a/runtime/CMakeLists.txt
++++ b/runtime/CMakeLists.txt
+@@ -1,17 +1,3 @@
+-
+-include(${CMAKE_ROOT}/Modules/ExternalProject.cmake)
+-
+-set(THIRDPARTY_DIR ${CMAKE_BINARY_DIR}/runtime/thirdparty)
+-set(UTFCPP_DIR ${THIRDPARTY_DIR}/utfcpp)
+-ExternalProject_Add(
+-  utfcpp
+-  GIT_REPOSITORY        "git://github.com/nemtrif/utfcpp"
+-  GIT_TAG               "v3.1.1"
+-  SOURCE_DIR            ${UTFCPP_DIR}
+-  UPDATE_DISCONNECTED   1
+-  CMAKE_ARGS            -DCMAKE_INSTALL_PREFIX=${UTFCPP_DIR}/install -Dgtest_force_shared_crt=ON
+-  TEST_AFTER_INSTALL    1
+-  STEP_TARGETS          build)
+ 
+ 
+ include_directories(
+@@ -23,8 +13,6 @@ include_directories(
+   ${PROJECT_SOURCE_DIR}/runtime/src/tree
+   ${PROJECT_SOURCE_DIR}/runtime/src/tree/pattern
+   ${PROJECT_SOURCE_DIR}/runtime/src/tree/xpath
+-  ${UTFCPP_DIR}/install/include/utf8cpp
+-  ${UTFCPP_DIR}/install/include/utf8cpp/utf8
+ )
+ 
+ 
+@@ -131,13 +119,6 @@ install(DIRECTORY "${PROJECT_SOURCE_DIR}/runtime/src/"
+         FILES_MATCHING PATTERN "*.h"
+         )
+ 
+-install(FILES "${UTFCPP_DIR}/source/utf8.h"
+-        DESTINATION "include/antlr4-runtime")
+-install(DIRECTORY "${UTFCPP_DIR}/source/utf8"
+-        DESTINATION "include/antlr4-runtime"
+-        COMPONENT dev
+-        FILES_MATCHING PATTERN "*.h"
+-        )
+ 
+ 
+ 
diff --git a/ports/antlr4/portfile.cmake b/ports/antlr4/portfile.cmake
index 6ceaa3af9b..1770cabfc1 100644
--- a/ports/antlr4/portfile.cmake
+++ b/ports/antlr4/portfile.cmake
@@ -1,11 +1,11 @@
 vcpkg_fail_port_install(ON_TARGET "uwp")
 
-set(VERSION 4.8)
+set(VERSION 4.9.1)
 
 vcpkg_download_distfile(ARCHIVE
     URLS "http://www.antlr.org/download/antlr4-cpp-runtime-${VERSION}-source.zip"
     FILENAME "antlr4-cpp-runtime-${VERSION}-source.zip"
-    SHA512 df76a724e8acf29018ad122d909e1d43e7c8842e1c0df8022a3e8c840cb2b99de49cc148f75fef519b65ece9bd27b92cf0067c9099b664c127e80559c6492322
+    SHA512 fe33005f73f8d408fcea8ebab62c0def119bbe0c075f04a66404d0df258126eb6caf0a8bbac34d5c4c9e79d4aa8896f32698a560d4be7d71a32dcc3457245cee
 )
 
 # license not exist in antlr folder.
@@ -20,9 +20,11 @@ vcpkg_extract_source_archive_ex(
     ARCHIVE ${ARCHIVE}
     NO_REMOVE_ONE_LEVEL
     REF ${VERSION}
-    PATCHES fixed_build.patch
-            uuid_discovery_fix.patch
-            export_guid.patch
+    PATCHES 
+        fixed_build.patch
+        uuid_discovery_fix.patch
+        export_guid.patch
+        fix_utfcpp_dependency.patch
 )
 
 vcpkg_configure_cmake(
diff --git a/versions/a-/antlr4.json b/versions/a-/antlr4.json
index d6c0f87550..fbf64088f7 100644
--- a/versions/a-/antlr4.json
+++ b/versions/a-/antlr4.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "846cffb150c26539ce36129c5a45d7ce54e6a1c8",
+      "version-string": "4.9.1",
+      "port-version": 0
+    },
     {
       "git-tree": "ed270bdb7075f6ed46cbe345c367ecb00ef64eff",
       "version-string": "4.8",
diff --git a/versions/baseline.json b/versions/baseline.json
index 4adebc09d3..02e8935dbd 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -81,8 +81,8 @@
       "port-version": 2
     },
     "antlr4": {
-      "baseline": "4.8",
-      "port-version": 1
+      "baseline": "4.9.1",
+      "port-version": 0
     },
     "any-lite": {
       "baseline": "0.2.0",