diff --git a/gateware/poetry.lock b/gateware/poetry.lock
index 7685b83..d9d8f53 100644
--- a/gateware/poetry.lock
+++ b/gateware/poetry.lock
@@ -91,7 +91,7 @@ pyvcd = ">=0.2.4,<0.3.0"
 name = "atomicwrites"
 version = "1.4.0"
 description = "Atomic file writes."
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
@@ -99,7 +99,7 @@ python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 name = "attrs"
 version = "21.4.0"
 description = "Classes Without Boilerplate"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
@@ -128,6 +128,36 @@ python-versions = ">=3.5.0"
 [package.extras]
 unicode_backport = ["unicodedata2"]
 
+[[package]]
+name = "cocotb"
+version = "1.7.1"
+description = "cocotb is a coroutine based cosimulation library for writing VHDL and Verilog testbenches in Python."
+category = "main"
+optional = false
+python-versions = ">=3.6"
+
+[package.extras]
+bus = ["cocotb-bus"]
+
+[[package]]
+name = "cocotb-test"
+version = "0.2.2"
+description = ""
+category = "main"
+optional = false
+python-versions = ">=3.7"
+develop = false
+
+[package.dependencies]
+cocotb = ">=1.5"
+pytest = "*"
+
+[package.source]
+type = "git"
+url = "https://github.com/nelgau/cocotb-test.git"
+reference = "master"
+resolved_reference = "1acba0644139fc776ec113b84042359b058f6640"
+
 [[package]]
 name = "colorama"
 version = "0.4.4"
@@ -314,7 +344,7 @@ resolved_reference = "08251daae42ec8cfc54fb82865a5942727186192"
 name = "more-itertools"
 version = "8.12.0"
 description = "More routines for operating on iterables, beyond itertools"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.5"
 
@@ -322,7 +352,7 @@ python-versions = ">=3.5"
 name = "packaging"
 version = "21.3"
 description = "Core utilities for Python packages"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.6"
 
@@ -333,7 +363,7 @@ pyparsing = ">=2.0.2,<3.0.5 || >3.0.5"
 name = "pluggy"
 version = "0.13.1"
 description = "plugin and hook calling mechanisms for python"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
@@ -344,7 +374,7 @@ dev = ["pre-commit", "tox"]
 name = "py"
 version = "1.11.0"
 description = "library with cross-python path, ini-parsing, io, code, log facilities"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
@@ -364,7 +394,7 @@ pyusb = ">=1.0.0,<1.2.0 || >1.2.0"
 name = "pyparsing"
 version = "3.0.7"
 description = "Python parsing module"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.6"
 
@@ -386,7 +416,7 @@ cp2110 = ["hidapi"]
 name = "pytest"
 version = "5.4.3"
 description = "pytest: simple powerful testing with Python"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.5"
 
@@ -481,7 +511,7 @@ resolved_reference = "a9830731a8de6946bfee014e6b0188ee83a716f2"
 name = "wcwidth"
 version = "0.2.5"
 description = "Measures the displayed width of unicode strings in a terminal"
-category = "dev"
+category = "main"
 optional = false
 python-versions = "*"
 
@@ -496,7 +526,7 @@ python-versions = "~=3.5"
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.10"
-content-hash = "2b9dada18d92722ad644077582a6e83a938940c0089005b62ece3a4ca3e8a258"
+content-hash = "7eb0430e0d33c39ef7544e6291b14ec5b38beecf78fcc83ac1d5cda10605738c"
 
 [metadata.files]
 amaranth = []
@@ -523,6 +553,35 @@ charset-normalizer = [
     {file = "charset-normalizer-2.0.10.tar.gz", hash = "sha256:876d180e9d7432c5d1dfd4c5d26b72f099d503e8fcc0feb7532c9289be60fcbd"},
     {file = "charset_normalizer-2.0.10-py3-none-any.whl", hash = "sha256:cb957888737fc0bbcd78e3df769addb41fd1ff8cf950dc9e7ad7793f1bf44455"},
 ]
+cocotb = [
+    {file = "cocotb-1.7.1-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:917e56ebac90829f32bda8a2f080bb3ad4339c962e1c24a4356bc4c0218d50fe"},
+    {file = "cocotb-1.7.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:69564799e548640fc77ef31d0bc0249f16ffcaf67ee05a817b63e6a13bb2e4ae"},
+    {file = "cocotb-1.7.1-cp310-cp310-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:d805aa8fe5350ceb9aeed5c6195c629293390e1e4286085ed3df000cf944cd16"},
+    {file = "cocotb-1.7.1-cp310-cp310-win32.whl", hash = "sha256:31ad6be3781979a6061952c65f3679495d3bc4a72de3b91f75c36fd201f19020"},
+    {file = "cocotb-1.7.1-cp310-cp310-win_amd64.whl", hash = "sha256:f1a6b024590d2b5568f736c8d8f2112a56a32fc3f9b3c279bbe1c4eacbdeebd9"},
+    {file = "cocotb-1.7.1-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:8ca82b64b922a43c161d010e18564e0fbaaf5146fd9d53eabee99e24c45c02dd"},
+    {file = "cocotb-1.7.1-cp36-cp36m-manylinux_2_5_i686.manylinux1_i686.whl", hash = "sha256:681139b2adf27d173cb3ca723e42382be3065fd458d44a808a695c969a3af31f"},
+    {file = "cocotb-1.7.1-cp36-cp36m-manylinux_2_5_x86_64.manylinux1_x86_64.whl", hash = "sha256:300c6416f076f04cca43502bd1a2f249327edf076b8b07dde13d85c180016be0"},
+    {file = "cocotb-1.7.1-cp36-cp36m-win32.whl", hash = "sha256:2e44754e21ef9b51313b656c4b2b65c82c88f6846fa9f5e5e1f2fe170320b385"},
+    {file = "cocotb-1.7.1-cp36-cp36m-win_amd64.whl", hash = "sha256:f6b24a5209cddd7b62e740077b980fb0c81385fc5e2983e4531fb08f6297ed93"},
+    {file = "cocotb-1.7.1-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:5078e824b8c9f96a937ac4ee0229bbff0cda03317e2f2febd05e2826d4bac9ea"},
+    {file = "cocotb-1.7.1-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:145000852c7fad6e4a6e92740f36e5c809809efaac73ae736d01ab86583468d2"},
+    {file = "cocotb-1.7.1-cp37-cp37m-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:c68c703a9d4230f406c855962c281ee2828e97167f795f2bab7adf839c4ec4df"},
+    {file = "cocotb-1.7.1-cp37-cp37m-win32.whl", hash = "sha256:4f8425c5cdee26caeeaa0f262e07e7760883bbfb9536c666619c87e265ea11ec"},
+    {file = "cocotb-1.7.1-cp37-cp37m-win_amd64.whl", hash = "sha256:77e5422e5bc7ce88b6aeacfb84ca41a8d6a9f5ff0ac2357e686c786f6c4a8e73"},
+    {file = "cocotb-1.7.1-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:c1046c0b8436cb7f7fd79fdb217cd54e2371bb51bb2d16de2e2c0acdd2d71fff"},
+    {file = "cocotb-1.7.1-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:ff9e0626fc24a6e1fa66ef39212aa623cbb3177a9df603d7a97a6b871cbcd740"},
+    {file = "cocotb-1.7.1-cp38-cp38-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:4e5c353009e25f34a14d8231e5114cf966c62a1d8838c15b2fc3fb19474502e9"},
+    {file = "cocotb-1.7.1-cp38-cp38-win32.whl", hash = "sha256:140301388228e285b0a2a8ed743cd8a82ac0341052c81387768f0e06b48eca84"},
+    {file = "cocotb-1.7.1-cp38-cp38-win_amd64.whl", hash = "sha256:dbec3c9a1b7ba322418162e8710f4432a1825f64f50aecba3f13fcfb6d7c6c3b"},
+    {file = "cocotb-1.7.1-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:83f6df0d2b3f3ba429a9f2934a102a0c130f0d78f73162537e2bc0ef31d903e5"},
+    {file = "cocotb-1.7.1-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:2d3e91dd0e7e689eb6194418ea9a833b6b8d24d512794a98b8005320502ab869"},
+    {file = "cocotb-1.7.1-cp39-cp39-manylinux_2_5_i686.manylinux1_i686.manylinux_2_17_i686.manylinux2014_i686.whl", hash = "sha256:3e8148cdd68188baa9243d87c37badb19e7a1ddb6b582397e42526b033f92050"},
+    {file = "cocotb-1.7.1-cp39-cp39-win32.whl", hash = "sha256:4873315122f7f673d762471dacb357b5d2c1e6658548ef4ee1b40f314d7a18d5"},
+    {file = "cocotb-1.7.1-cp39-cp39-win_amd64.whl", hash = "sha256:ab84c58e56fd83710c5f443e5d97de9ba39a4375d40d00f422716ccbf2aaafc9"},
+    {file = "cocotb-1.7.1.tar.gz", hash = "sha256:1f390bb6468d70e04acebeb9ff05b54be42cbbbbbb3bd6c75d1ec0a36cb97e23"},
+]
+cocotb-test = []
 colorama = [
     {file = "colorama-0.4.4-py2.py3-none-any.whl", hash = "sha256:9f47eda37229f68eee03b24b9748937c7dc3868f906e8ba69fbcbdd3bc5dc3e2"},
     {file = "colorama-0.4.4.tar.gz", hash = "sha256:5941b2b48a20143d2267e95b1c2a7603ce057ee39fd88e7329b0c292aa16869b"},
diff --git a/gateware/pyproject.toml b/gateware/pyproject.toml
index 2822d27..9ec139f 100644
--- a/gateware/pyproject.toml
+++ b/gateware/pyproject.toml
@@ -18,6 +18,9 @@ luna = {git = "https://github.com/greatscottgadgets/luna.git", branch="main"}
 lambdasoc = {git = "https://github.com/nelgau/lambdasoc.git", branch="fix-compiler-rt"}
 litex = {git = "https://github.com/enjoy-digital/litex"}
 litedram = {git = "https://github.com/enjoy-digital/litedram.git"}
+# Cosimulation testing dependencies
+cocotb = "^1.7.1"
+cocotb-test = {git = "https://github.com/nelgau/cocotb-test.git", branch="master"}
 
 [tool.poetry.dev-dependencies]
 pytest = "^5.2"