diff --git a/.github/workflows/netwiz_ci.yml b/.github/workflows/netwiz_ci.yml
index 406b47a..f030b6d 100644
--- a/.github/workflows/netwiz_ci.yml
+++ b/.github/workflows/netwiz_ci.yml
@@ -8,7 +8,7 @@ on:
   pull_request:
 
 jobs:
-  simulate:
+  ghdl_sim:
     runs-on: ubuntu-latest
     steps:
     - uses: ghdl/setup-ghdl-ci@nightly
@@ -19,8 +19,32 @@ jobs:
     - name: sim
       working-directory: ./script
       run: bash ghdl_run_all.sh
+  # while we wait for the official nvc githib action, we simply install nvc in the GHDL container.
+  nvc_sim:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: ghdl/setup-ghdl-ci@nightly
+      with:
+        backend: llvm
+    - name: checkout
+      uses: actions/checkout@v3
+    # nvc install from source
+    - name: clone
+      run: git clone https://github.com/nickg/nvc.git
+    - name: prepare
+      working-directory: ./nvc
+      run: ./autogen.sh && mkdir build
+    - name: update 
+      run: sudo apt-get install build-essential automake autoconf flex check llvm-dev pkg-config zlib1g-dev libdw-dev libffi-dev libzstd-dev
+    - name: compile
+      working-directory: ./nvc/build
+      run: ../configure && make && sudo make install
+    # simulate
+    - name: sim
+      working-directory: ./script
+      run: bash nvc_run_all.sh
   document:
-    needs: simulate
+    needs: [ghdl_sim, nvc_sim]
     runs-on: ubuntu-latest
     steps:
       - uses: DenverCoder1/doxygen-github-pages-action@v1.3.0
diff --git a/.gitignore b/.gitignore
index 354e3c7..09c5304 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,5 +3,5 @@ html
 _NVC_LIB
 *~
 script/*
-!script/ghdl_run_all.sh
-!script/modelsim_run_all.do
\ No newline at end of file
+!script/*.sh
+!script/*.do
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8381a2c..f2b0ed5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.3.1] - 2023-10-16
+
+### Changed
+  - Added additional simulation job using nvc.
+
 ## [1.3.0] - 2023-10-13
 
 ### Added
diff --git a/script/nvc_run_all.sh b/script/nvc_run_all.sh
new file mode 100644
index 0000000..a659835
--- /dev/null
+++ b/script/nvc_run_all.sh
@@ -0,0 +1,84 @@
+#!/bin/bash
+# MIT License
+#
+# Copyright (c) 2023 Geir Drange
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+echo -e "\n"
+echo "███    ██ ███████ ████████ ██     ██ ██ ███████ "
+echo "████   ██ ██         ██    ██     ██ ██    ███  "
+echo "██ ██  ██ █████      ██    ██  █  ██ ██   ███   "
+echo "██  ██ ██ ██         ██    ██ ███ ██ ██  ███    "
+echo "██   ████ ███████    ██     ███ ███  ██ ███████ "
+# nw_adapt
+nvc --std=2008 --work=nw_adapt -a ../nw_adapt/src/nw_adaptations_pkg.vhd
+# nw_util
+echo -e "\nTesting nw_util:"
+nvc --std=2008 --work=nw_util -a ../nw_util/src/nw_types_pkg.vhd
+nvc --std=2008 --work=nw_util -L . -a ../nw_util/src/nw_util_pkg.vhd
+nvc --std=2008 --work=nw_util -L . -a ../nw_util/src/nw_crc_pkg.vhd
+nvc --std=2008 --work=nw_util -L . -a ../nw_util/src/nw_nrs_pkg.vhd
+nvc --std=2008 --work=nw_util -L . -a ../nw_util/src/nw_prbs_pkg.vhd
+nvc --std=2008 --work=nw_util -L . -a ../nw_util/src/nw_util_context.vhd
+nvc --std=2008 -L . -a  ../nw_util/tb/nw_util_tb.vhd -e nw_util_tb -r
+# nw_pcap
+echo -e "\nTesting nw_pcap:"
+nvc --std=2008 --work=nw_pcap -L . -a ../nw_pcap/src/nw_pcap_pkg.vhd
+nvc --std=2008 -L . -a ../nw_pcap/tb/nw_pcap_tb.vhd -e nw_pcap_tb -r
+# nw_ethernet
+echo -e "\nTesting nw_ethernet:"                                                                 
+nvc --std=2008 --work=nw_ethernet -L . -a ../nw_ethernet/src/nw_ethernet_pkg.vhd
+nvc --std=2008 --work=nw_ethernet -L . -a ../nw_ethernet/src/nw_arp_pkg.vhd
+nvc --std=2008 --work=nw_ethernet -L . -a ../nw_ethernet/src/nw_ethernet_context.vhd
+nvc --std=2008 --work=work -L . -a ../nw_ethernet/tb/nw_ethernet_tb.vhd -e nw_ethernet_tb -r
+# nw_ipv4
+echo -e "\nTesting nw_ipv4"
+nvc --std=2008 --work=nw_ipv4 -L . -a ../nw_ipv4/src/ip_protocols_pkg.vhd
+nvc --std=2008 --work=nw_ipv4 -L . -a ../nw_ipv4/src/nw_ipv4_pkg.vhd
+nvc --std=2008 --work=nw_ipv4 -L . -a ../nw_ipv4/src/nw_udpv4_pkg.vhd
+nvc --std=2008 --work=nw_ipv4 -L . -a ../nw_ipv4/src/nw_icmpv4_pkg.vhd
+nvc --std=2008 --work=nw_ipv4 -L . -a ../nw_ipv4/src/nw_tcpv4_pkg.vhd
+nvc --std=2008 --work=nw_ipv4 -L . -a ../nw_ipv4/src/nw_ipv4_context.vhd
+nvc --std=2008 --work=work -L . -a ../nw_ipv4/tb/nw_ipv4_tb.vhd -e nw_ipv4_tb -r
+# nw_ipv6
+echo -e "\nTesting nw_ipv6"
+nvc --std=2008 --work=nw_ipv6 -L . -a ../nw_ipv6/src/nw_ipv6_pkg.vhd
+nvc --std=2008 --work=nw_ipv6 -L . -a ../nw_ipv6/src/nw_udpv6_pkg.vhd
+nvc --std=2008 --work=nw_ipv6 -L . -a ../nw_ipv6/src/nw_icmpv6_pkg.vhd
+nvc --std=2008 --work=nw_ipv6 -L . -a ../nw_ipv6/src/nw_tcpv6_pkg.vhd
+nvc --std=2008 --work=nw_ipv6 -L . -a ../nw_ipv6/src/nw_ipv6_context.vhd
+nvc --std=2008 --work=work -L . -a ../nw_ipv6/tb/nw_ipv6_tb.vhd -e nw_ipv6_tb -r
+# nw_codec
+echo -e "\nTesting nw_codec"
+nvc --std=2008 --work=nw_codec -L . -a ../nw_codec/src/nw_sl_codec_pkg.vhd
+nvc --std=2008 --work=nw_codec -L . -a ../nw_codec/src/nw_cobs_pkg.vhd
+nvc --std=2008 --work=nw_codec -L . -a ../nw_codec/src/nw_base_pkg.vhd
+nvc --std=2008 --work=nw_codec -L . -a ../nw_codec/src/nw_bitstuff_pkg.vhd
+nvc --std=2008 --work=nw_codec -L . -a ../nw_codec/src/nw_hamming_pkg.vhd
+nvc --std=2008 --work=nw_codec -L . -a ../nw_codec/src/nw_codec_context.vhd
+nvc --std=2008 --work=work -L . -a ../nw_codec/tb/nw_codec_tb.vhd -e nw_codec_tb -r
+# nw_ptp
+echo -e "\nTesting nw_ptp"
+nvc --std=2008 --work=nw_ptp -L . -a ../nw_ptp/src/nw_ptpv2_pkg.vhd
+nvc --std=2008 --work=work -L . -a ../nw_ptp/tb/nw_ptp_tb.vhd -e nw_ptp_tb -r
+# nw_usb
+echo -e "\nTesting nw_usb"
+nvc --std=2008 --work=nw_usb -L . -a ../nw_usb/src/nw_usb_pkg.vhd
+nvc --std=2008 --work=nw_usb -L . -a ../nw_usb/src/nw_usb_context.vhd
+nvc --std=2008 --work=work -L . -a ../nw_usb/tb/nw_usb_tb.vhd -e nw_usb_tb -r