diff --git a/CHANGELOG.md b/CHANGELOG.md
index f213f0765..7b8bf73e6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 2.1.2 (2020-07-06)
+
+- Fixed tree builder to skip virtual environments.
+
 # 2.1.1 (2020-02-16)
 
 - Fixed missing `six` dependency.
diff --git a/doorstop/core/builder.py b/doorstop/core/builder.py
index 4c6c66a44..2458877ff 100644
--- a/doorstop/core/builder.py
+++ b/doorstop/core/builder.py
@@ -39,7 +39,7 @@ def build(cwd=None, root=None, request_next_number=None) -> Tree:
     skip_file_name = '.doorstop.skip-all'
     if not os.path.isfile(os.path.join(root, skip_file_name)):
         _document_from_path(root, root, documents)
-    exclude_dirnames = {'.git'}
+    exclude_dirnames = {'.git', '.venv', 'venv'}
     if not os.path.isfile(os.path.join(root, skip_file_name)):
         for dirpath, dirnames, _ in os.walk(root, topdown=True):
             whilelist_dirnames = []
diff --git a/doorstop/core/tests/files/.venv/doorstop/reqs/.doorstop.yml b/doorstop/core/tests/files/.venv/doorstop/reqs/.doorstop.yml
new file mode 100644
index 000000000..880601726
--- /dev/null
+++ b/doorstop/core/tests/files/.venv/doorstop/reqs/.doorstop.yml
@@ -0,0 +1,4 @@
+settings:
+  digits: 2
+  prefix: REQ
+  sep: ''
diff --git a/poetry.lock b/poetry.lock
index 1a7cbd025..f991335d4 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -12,20 +12,20 @@ description = "A small Python module for determining appropriate platform-specif
 name = "appdirs"
 optional = false
 python-versions = "*"
-version = "1.4.3"
+version = "1.4.4"
 
 [[package]]
 category = "dev"
 description = "An abstract syntax tree for Python with inference support."
 name = "astroid"
 optional = false
-python-versions = ">=3.5.*"
-version = "2.3.3"
+python-versions = ">=3.5"
+version = "2.4.2"
 
 [package.dependencies]
 lazy-object-proxy = ">=1.4.0,<1.5.0"
 six = ">=1.12,<2.0"
-wrapt = ">=1.11.0,<1.12.0"
+wrapt = ">=1.11,<2.0"
 
 [package.dependencies.typed-ast]
 python = "<3.8"
@@ -79,7 +79,7 @@ description = "Python package for providing Mozilla's CA Bundle."
 name = "certifi"
 optional = false
 python-versions = "*"
-version = "2019.11.28"
+version = "2020.6.20"
 
 [[package]]
 category = "main"
@@ -94,8 +94,8 @@ category = "dev"
 description = "Composable command line interface toolkit"
 name = "click"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "7.0"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+version = "7.1.2"
 
 [[package]]
 category = "dev"
@@ -122,7 +122,7 @@ description = "Code coverage measurement for Python"
 name = "coverage"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
-version = "5.0.3"
+version = "5.2"
 
 [package.extras]
 toml = ["toml"]
@@ -180,7 +180,7 @@ description = "A comprehensive HTTP client library."
 name = "httplib2"
 optional = false
 python-versions = "*"
-version = "0.17.0"
+version = "0.18.1"
 
 [[package]]
 category = "main"
@@ -188,7 +188,7 @@ description = "Internationalized Domain Names in Applications (IDNA)"
 name = "idna"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
-version = "2.8"
+version = "2.10"
 
 [[package]]
 category = "dev"
@@ -218,7 +218,7 @@ description = "A very fast and expressive template engine."
 name = "jinja2"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "2.11.1"
+version = "2.11.2"
 
 [package.dependencies]
 MarkupSafe = ">=0.23"
@@ -240,11 +240,14 @@ description = "Python LiveReload is an awesome tool for web developers"
 name = "livereload"
 optional = false
 python-versions = "*"
-version = "2.6.1"
+version = "2.6.2"
 
 [package.dependencies]
 six = "*"
-tornado = "*"
+
+[package.dependencies.tornado]
+python = ">=2.8"
+version = "*"
 
 [[package]]
 category = "dev"
@@ -296,7 +299,7 @@ description = "Minimalistic wrapper for Python logging."
 name = "minilog"
 optional = false
 python-versions = ">=3.6,<4.0"
-version = "1.4"
+version = "1.6"
 
 [[package]]
 category = "dev"
@@ -398,7 +401,7 @@ description = "Utility library for gitignore style pattern matching of file path
 name = "pathspec"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "0.7.0"
+version = "0.8.0"
 
 [[package]]
 category = "main"
@@ -417,7 +420,7 @@ description = "A PlantUML plugin for Markdown"
 name = "plantuml-markdown"
 optional = false
 python-versions = "*"
-version = "3.2.1"
+version = "3.3.0"
 
 [package.dependencies]
 Markdown = "*"
@@ -451,8 +454,8 @@ category = "main"
 description = "Pygments is a syntax highlighting package written in Python."
 name = "pygments"
 optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "2.5.2"
+python-versions = ">=3.5"
+version = "2.6.1"
 
 [[package]]
 category = "dev"
@@ -530,7 +533,7 @@ description = "YAML parser and emitter for Python"
 name = "pyyaml"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "5.3"
+version = "5.3.1"
 
 [[package]]
 category = "dev"
@@ -538,7 +541,7 @@ description = "Alternative regular expression module, to replace re."
 name = "regex"
 optional = false
 python-versions = "*"
-version = "2020.1.8"
+version = "2020.6.8"
 
 [[package]]
 category = "main"
@@ -546,16 +549,16 @@ description = "Python HTTP for Humans."
 name = "requests"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-version = "2.22.0"
+version = "2.24.0"
 
 [package.dependencies]
 certifi = ">=2017.4.17"
-chardet = ">=3.0.2,<3.1.0"
-idna = ">=2.5,<2.9"
+chardet = ">=3.0.2,<4"
+idna = ">=2.5,<3"
 urllib3 = ">=1.21.1,<1.25.0 || >1.25.0,<1.25.1 || >1.25.1,<1.26"
 
 [package.extras]
-security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)"]
+security = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)"]
 socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7)", "win-inet-pton"]
 
 [[package]]
@@ -572,7 +575,7 @@ description = "Python 2 and 3 compatibility utilities"
 name = "six"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
-version = "1.14.0"
+version = "1.15.0"
 
 [[package]]
 category = "dev"
@@ -607,7 +610,7 @@ description = "Python Library for Tom's Obvious, Minimal Language"
 name = "toml"
 optional = false
 python-versions = "*"
-version = "0.10.0"
+version = "0.10.1"
 
 [[package]]
 category = "dev"
@@ -615,7 +618,7 @@ description = "Tornado is a Python web framework and asynchronous networking lib
 name = "tornado"
 optional = false
 python-versions = ">= 3.5"
-version = "6.0.3"
+version = "6.0.4"
 
 [[package]]
 category = "dev"
@@ -631,7 +634,7 @@ description = "Backported and Experimental Type Hints for Python 3.5+"
 name = "typing-extensions"
 optional = false
 python-versions = "*"
-version = "3.7.4.1"
+version = "3.7.4.2"
 
 [[package]]
 category = "main"
@@ -639,11 +642,11 @@ description = "HTTP library with thread-safe connection pooling, file post, and
 name = "urllib3"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, <4"
-version = "1.25.8"
+version = "1.25.9"
 
 [package.extras]
 brotli = ["brotlipy (>=0.6.0)"]
-secure = ["pyOpenSSL (>=0.14)", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "certifi", "ipaddress"]
+secure = ["certifi", "cryptography (>=1.3.4)", "idna (>=2.0.0)", "pyOpenSSL (>=0.14)", "ipaddress"]
 socks = ["PySocks (>=1.5.6,<1.5.7 || >1.5.7,<2.0)"]
 
 [[package]]
@@ -652,7 +655,7 @@ description = "Module for decorators, wrappers and monkey patching."
 name = "wrapt"
 optional = false
 python-versions = "*"
-version = "1.11.2"
+version = "1.12.1"
 
 [metadata]
 content-hash = "2ecebca6ce7db48f13ed02faf5313b6819171b463346be69aba2d55ad4b27f3c"
@@ -664,12 +667,12 @@ altgraph = [
     {file = "altgraph-0.17.tar.gz", hash = "sha256:1f05a47122542f97028caf78775a095fbe6a2699b5089de8477eb583167d69aa"},
 ]
 appdirs = [
-    {file = "appdirs-1.4.3-py2.py3-none-any.whl", hash = "sha256:d8b24664561d0d34ddfaec54636d502d7cea6e29c3eaf68f3df6180863e2166e"},
-    {file = "appdirs-1.4.3.tar.gz", hash = "sha256:9e5896d1372858f8dd3344faf4e5014d21849c756c8d5701f78f8a103b372d92"},
+    {file = "appdirs-1.4.4-py2.py3-none-any.whl", hash = "sha256:a841dacd6b99318a741b166adb07e19ee71a274450e68237b4650ca1055ab128"},
+    {file = "appdirs-1.4.4.tar.gz", hash = "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41"},
 ]
 astroid = [
-    {file = "astroid-2.3.3-py3-none-any.whl", hash = "sha256:840947ebfa8b58f318d42301cf8c0a20fd794a33b61cc4638e28e9e61ba32f42"},
-    {file = "astroid-2.3.3.tar.gz", hash = "sha256:71ea07f44df9568a75d0f354c49143a4575d90645e9fead6dfb52c26a85ed13a"},
+    {file = "astroid-2.4.2-py3-none-any.whl", hash = "sha256:bc58d83eb610252fd8de6363e39d4f1d0619c894b0ed24603b881c02e64c7386"},
+    {file = "astroid-2.4.2.tar.gz", hash = "sha256:2f4078c2a41bf377eea06d71c9d2ba4eb8f6b1af2135bec27bbbb7d8f12bb703"},
 ]
 attrs = [
     {file = "attrs-19.3.0-py2.py3-none-any.whl", hash = "sha256:08a96c641c3a74e44eb59afb61a24f2cb9f4d7188748e76ba4bb5edfa3cb7d1c"},
@@ -684,16 +687,16 @@ bottle = [
     {file = "bottle-0.12.18.tar.gz", hash = "sha256:0819b74b145a7def225c0e83b16a4d5711fde751cd92bae467a69efce720f69e"},
 ]
 certifi = [
-    {file = "certifi-2019.11.28-py2.py3-none-any.whl", hash = "sha256:017c25db2a153ce562900032d5bc68e9f191e44e9a0f762f373977de9df1fbb3"},
-    {file = "certifi-2019.11.28.tar.gz", hash = "sha256:25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f"},
+    {file = "certifi-2020.6.20-py2.py3-none-any.whl", hash = "sha256:8fc0819f1f30ba15bdb34cceffb9ef04d99f420f68eb75d901e9560b8749fc41"},
+    {file = "certifi-2020.6.20.tar.gz", hash = "sha256:5930595817496dd21bb8dc35dad090f1c2cd0adfaf21204bf6732ca5d8ee34d3"},
 ]
 chardet = [
     {file = "chardet-3.0.4-py2.py3-none-any.whl", hash = "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"},
     {file = "chardet-3.0.4.tar.gz", hash = "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae"},
 ]
 click = [
-    {file = "Click-7.0-py2.py3-none-any.whl", hash = "sha256:2335065e6395b9e67ca716de5f7526736bfa6ceead690adf616d925bdc622b13"},
-    {file = "Click-7.0.tar.gz", hash = "sha256:5b94b49521f6456670fdb30cd82a4eca9412788a93fa6dd6df72c94d5a8ff2d7"},
+    {file = "click-7.1.2-py2.py3-none-any.whl", hash = "sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc"},
+    {file = "click-7.1.2.tar.gz", hash = "sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a"},
 ]
 colorama = [
     {file = "colorama-0.3.9-py2.py3-none-any.whl", hash = "sha256:463f8483208e921368c9f306094eb6f725c6ca42b0f97e313cb5d5512459feda"},
@@ -703,37 +706,40 @@ cov-core = [
     {file = "cov-core-1.15.0.tar.gz", hash = "sha256:4a14c67d520fda9d42b0da6134638578caae1d374b9bb462d8de00587dba764c"},
 ]
 coverage = [
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-    {file = "coverage-5.0.3-cp27-cp27m-macosx_10_13_intel.whl", hash = "sha256:be18f4ae5a9e46edae3f329de2191747966a34a3d93046dbdf897319923923bc"},
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-    {file = "coverage-5.0.3-cp27-cp27m-manylinux1_x86_64.whl", hash = "sha256:e69215621707119c6baf99bda014a45b999d37602cb7043d943c76a59b05bf52"},
-    {file = "coverage-5.0.3-cp27-cp27m-win32.whl", hash = "sha256:1daa3eceed220f9fdb80d5ff950dd95112cd27f70d004c7918ca6dfc6c47054c"},
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@@ -1040,14 +1046,14 @@ typed-ast = [
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diff --git a/pyproject.toml b/pyproject.toml
index 204d75e01..fce27593f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [tool.poetry]
 
 name = "doorstop"
-version = "2.1.1"
+version = "2.1.2"
 description = "Requirements management using version control."
 
 license = "LGPLv3"