diff --git a/poetry.lock b/poetry.lock
index ab9b4993..2e5f3cbe 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -585,19 +585,6 @@ isort = ">=4.2.5,<6"
 mccabe = ">=0.6,<0.7"
 toml = ">=0.7.1"
 
-[[package]]
-name = "pynpm"
-version = "0.1.2"
-description = "Python interface to your NPM and package.json."
-category = "dev"
-optional = false
-python-versions = "*"
-
-[package.extras]
-all = ["Sphinx (>=1.5.1)", "check-manifest (>=0.25)", "coverage (>=4.0)", "isort (>=4.2.2)", "pydocstyle (>=1.0.0)", "pytest-cache (>=1.0)", "pytest-cov (>=1.8.0)", "pytest-pep8 (>=1.0.6)", "pytest (>=2.8.0)"]
-docs = ["Sphinx (>=1.5.1)"]
-tests = ["check-manifest (>=0.25)", "coverage (>=4.0)", "isort (>=4.2.2)", "pydocstyle (>=1.0.0)", "pytest-cache (>=1.0)", "pytest-cov (>=1.8.0)", "pytest-pep8 (>=1.0.6)", "pytest (>=2.8.0)"]
-
 [[package]]
 name = "pyparsing"
 version = "2.4.7"
@@ -757,7 +744,7 @@ python-versions = "*"
 
 [[package]]
 name = "sphinx"
-version = "3.4.2"
+version = "3.4.3"
 description = "Python documentation generator"
 category = "dev"
 optional = false
@@ -1421,10 +1408,6 @@ pylint = [
     {file = "pylint-2.6.0-py3-none-any.whl", hash = "sha256:bfe68f020f8a0fece830a22dd4d5dddb4ecc6137db04face4c3420a46a52239f"},
     {file = "pylint-2.6.0.tar.gz", hash = "sha256:bb4a908c9dadbc3aac18860550e870f58e1a02c9f2c204fdf5693d73be061210"},
 ]
-pynpm = [
-    {file = "pynpm-0.1.2-py2.py3-none-any.whl", hash = "sha256:3f03fbf667549f8b8b7e0419eef88d1b21833ce288f96de66fbb761b9f4c4061"},
-    {file = "pynpm-0.1.2.tar.gz", hash = "sha256:8a6d3f9423760cf3c142db3bf9bda5a075e8a91837e7d2e2b0a3de5be5e26da2"},
-]
 pyparsing = [
     {file = "pyparsing-2.4.7-py2.py3-none-any.whl", hash = "sha256:ef9d7589ef3c200abe66653d3f1ab1033c3c419ae9b9bdb1240a85b024efc88b"},
     {file = "pyparsing-2.4.7.tar.gz", hash = "sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1"},
@@ -1508,8 +1491,8 @@ snowballstemmer = [
     {file = "snowballstemmer-2.0.0.tar.gz", hash = "sha256:df3bac3df4c2c01363f3dd2cfa78cce2840a79b9f1c2d2de9ce8d31683992f52"},
 ]
 sphinx = [
-    {file = "Sphinx-3.4.2-py3-none-any.whl", hash = "sha256:b8aa4eb5502c53d3b5ca13a07abeedacd887f7770c198952fd5b9530d973e767"},
-    {file = "Sphinx-3.4.2.tar.gz", hash = "sha256:77dec5ac77ca46eee54f59cf477780f4fb23327b3339ef39c8471abb829c1285"},
+    {file = "Sphinx-3.4.3-py3-none-any.whl", hash = "sha256:c314c857e7cd47c856d2c5adff514ac2e6495f8b8e0f886a8a37e9305dfea0d8"},
+    {file = "Sphinx-3.4.3.tar.gz", hash = "sha256:41cad293f954f7d37f803d97eb184158cfd90f51195131e94875bc07cd08b93c"},
 ]
 sphinxcontrib-applehelp = [
     {file = "sphinxcontrib-applehelp-1.0.2.tar.gz", hash = "sha256:a072735ec80e7675e3f432fcae8610ecf509c5f1869d17e2eecff44389cdbc58"},
diff --git a/pyproject.toml b/pyproject.toml
index 644f61c6..d7bccc65 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -56,7 +56,6 @@ rpi = ["RPi.GPIO"]
 rescue = 'openflexure_microscope.rescue.auto:main'
 
 [tool.poetry.dev-dependencies]
-pynpm = "^0.1.2"
 sphinxcontrib-httpdomain = "^1.7"
 rope = "^0.14.0"
 pylint = "^2.3"