diff --git a/doc/Hammer-Basics/Hammer-Setup.md b/doc/Hammer-Basics/Hammer-Setup.md
index 916dcd540..33ae2b464 100644
--- a/doc/Hammer-Basics/Hammer-Setup.md
+++ b/doc/Hammer-Basics/Hammer-Setup.md
@@ -12,12 +12,18 @@ You can install Hammer from PyPI:
 pip install hammer-vlsi
 ```
 
-If you are using ASAP7, you need to install hammer-vlsi with the asap7 extra dependency (gdstk).
+If you are using ASAP7, you need to install hammer-vlsi with the asap7 extra dependency (gdspy or gdstk). By default, gdspy is installed:
 
 ```shell
 pip install hammer-vlsi[asap7]
 ```
 
+If instead, you want to install gdstk:
+
+```shell
+pip install hammer-vlsi[asap7-gdstk]
+```
+
 After installation, verify that you can run the `hammer-vlsi` script from the command line.
 
 ```shell
diff --git a/poetry.lock b/poetry.lock
index 50cd7beb9..7ca376e95 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -14,19 +14,19 @@ files = [
 
 [[package]]
 name = "astroid"
-version = "2.13.2"
+version = "2.13.3"
 description = "An abstract syntax tree for Python with inference support."
 category = "dev"
 optional = false
 python-versions = ">=3.7.2"
 files = [
-    {file = "astroid-2.13.2-py3-none-any.whl", hash = "sha256:8f6a8d40c4ad161d6fc419545ae4b2f275ed86d1c989c97825772120842ee0d2"},
-    {file = "astroid-2.13.2.tar.gz", hash = "sha256:3bc7834720e1a24ca797fd785d77efb14f7a28ee8e635ef040b6e2d80ccb3303"},
+    {file = "astroid-2.13.3-py3-none-any.whl", hash = "sha256:14c1603c41cc61aae731cad1884a073c4645e26f126d13ac8346113c95577f3b"},
+    {file = "astroid-2.13.3.tar.gz", hash = "sha256:6afc22718a48a689ca24a97981ad377ba7fb78c133f40335dfd16772f29bcfb1"},
 ]
 
 [package.dependencies]
 lazy-object-proxy = ">=1.4.0"
-typing-extensions = ">=4.0.0"
+typing-extensions = {version = ">=4.0.0", markers = "python_version < \"3.11\""}
 wrapt = [
     {version = ">=1.11,<2", markers = "python_version < \"3.11\""},
     {version = ">=1.14,<2", markers = "python_version >= \"3.11\""},
@@ -909,6 +909,13 @@ files = [
     {file = "PyYAML-6.0-cp310-cp310-manylinux_2_5_x86_64.manylinux1_x86_64.manylinux_2_12_x86_64.manylinux2010_x86_64.whl", hash = "sha256:f84fbc98b019fef2ee9a1cb3ce93e3187a6df0b2538a651bfb890254ba9f90b5"},
     {file = "PyYAML-6.0-cp310-cp310-win32.whl", hash = "sha256:2cd5df3de48857ed0544b34e2d40e9fac445930039f3cfe4bcc592a1f836d513"},
     {file = "PyYAML-6.0-cp310-cp310-win_amd64.whl", hash = "sha256:daf496c58a8c52083df09b80c860005194014c3698698d1a57cbcfa182142a3a"},
+    {file = "PyYAML-6.0-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:d4b0ba9512519522b118090257be113b9468d804b19d63c71dbcf4a48fa32358"},
+    {file = "PyYAML-6.0-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:81957921f441d50af23654aa6c5e5eaf9b06aba7f0a19c18a538dc7ef291c5a1"},
+    {file = "PyYAML-6.0-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:afa17f5bc4d1b10afd4466fd3a44dc0e245382deca5b3c353d8b757f9e3ecb8d"},
+    {file = "PyYAML-6.0-cp311-cp311-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:dbad0e9d368bb989f4515da330b88a057617d16b6a8245084f1b05400f24609f"},
+    {file = "PyYAML-6.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:432557aa2c09802be39460360ddffd48156e30721f5e8d917f01d31694216782"},
+    {file = "PyYAML-6.0-cp311-cp311-win32.whl", hash = "sha256:bfaef573a63ba8923503d27530362590ff4f576c626d86a9fed95822a8255fd7"},
+    {file = "PyYAML-6.0-cp311-cp311-win_amd64.whl", hash = "sha256:01b45c0191e6d66c470b6cf1b9531a771a83c1c4208272ead47a3ae4f2f603bf"},
     {file = "PyYAML-6.0-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:897b80890765f037df3403d22bab41627ca8811ae55e9a722fd0392850ec4d86"},
     {file = "PyYAML-6.0-cp36-cp36m-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:50602afada6d6cbfad699b0c7bb50d5ccffa7e46a3d738092afddc1f9758427f"},
     {file = "PyYAML-6.0-cp36-cp36m-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:48c346915c114f5fdb3ead70312bd042a953a8ce5c7106d5bfb1a5254e47da92"},
@@ -994,6 +1001,7 @@ files = [
     {file = "ruamel.yaml.clib-0.2.7-cp310-cp310-win_amd64.whl", hash = "sha256:d000f258cf42fec2b1bbf2863c61d7b8918d31ffee905da62dede869254d3b8a"},
     {file = "ruamel.yaml.clib-0.2.7-cp311-cp311-macosx_10_9_universal2.whl", hash = "sha256:045e0626baf1c52e5527bd5db361bc83180faaba2ff586e763d3d5982a876a9e"},
     {file = "ruamel.yaml.clib-0.2.7-cp311-cp311-macosx_12_6_arm64.whl", hash = "sha256:721bc4ba4525f53f6a611ec0967bdcee61b31df5a56801281027a3a6d1c2daf5"},
+    {file = "ruamel.yaml.clib-0.2.7-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_24_x86_64.whl", hash = "sha256:41d0f1fa4c6830176eef5b276af04c89320ea616655d01327d5ce65e50575c94"},
     {file = "ruamel.yaml.clib-0.2.7-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:4b3a93bb9bc662fc1f99c5c3ea8e623d8b23ad22f861eb6fce9377ac07ad6072"},
     {file = "ruamel.yaml.clib-0.2.7-cp36-cp36m-macosx_12_0_arm64.whl", hash = "sha256:a234a20ae07e8469da311e182e70ef6b199d0fbeb6c6cc2901204dd87fb867e8"},
     {file = "ruamel.yaml.clib-0.2.7-cp36-cp36m-manylinux2014_aarch64.whl", hash = "sha256:15910ef4f3e537eea7fe45f8a5d19997479940d9196f357152a09031c5be59f3"},
@@ -1102,14 +1110,14 @@ dev = ["bump2version", "sphinxcontrib-httpdomain", "transifex-client", "wheel"]
 
 [[package]]
 name = "sphinxcontrib-applehelp"
-version = "1.0.3"
+version = "1.0.4"
 description = "sphinxcontrib-applehelp is a Sphinx extension which outputs Apple help books"
 category = "dev"
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "sphinxcontrib.applehelp-1.0.3-py3-none-any.whl", hash = "sha256:ba0f2a22e6eeada8da6428d0d520215ee8864253f32facf958cca81e426f661d"},
-    {file = "sphinxcontrib.applehelp-1.0.3.tar.gz", hash = "sha256:83749f09f6ac843b8cb685277dbc818a8bf2d76cc19602699094fe9a74db529e"},
+    {file = "sphinxcontrib-applehelp-1.0.4.tar.gz", hash = "sha256:828f867945bbe39817c210a1abfd1bc4895c8b73fcaade56d45357a348a07d7e"},
+    {file = "sphinxcontrib_applehelp-1.0.4-py3-none-any.whl", hash = "sha256:29d341f67fb0f6f586b23ad80e072c8e6ad0b48417db2bde114a4c9746feb228"},
 ]
 
 [package.extras]
@@ -1399,8 +1407,9 @@ testing = ["flake8 (<5)", "func-timeout", "jaraco.functools", "jaraco.itertools"
 
 [extras]
 asap7 = ["gdspy"]
+asap7-gdstk = ["gdstk"]
 
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9"
-content-hash = "0d6a06f27022f3e7dc713fb5bcd42f861cab0853a95af9cc1f700ccdc3aed879"
+content-hash = "010b3a88ee8645e703e98c359f877f1b24bb2accc6082e9ade79bcc57a808056"
diff --git a/pyproject.toml b/pyproject.toml
index efcdd7407..df9aac953 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,7 @@ gdstk = { version = "^0.9.0", optional = true }
 gdspy = { version = "1.4", optional = true }
 
 [tool.poetry.extras]
-# asap7 = ["gdstk"]
+asap7-gdstk = ["gdstk"]
 asap7 = ["gdspy"]
 
 [tool.poetry.dev-dependencies]