diff --git a/Makefile b/Makefile
index b1ac585..e1f1b87 100644
--- a/Makefile
+++ b/Makefile
@@ -27,5 +27,7 @@ test: lint
 tox:
 	tox
 
+# This requires sphinx-autobuild. It is not listed in the Pipfile because
+# PyPy3 does not like it and causes CI to fail. :(
 watch:
 	pipenv run sphinx-autobuild docs/source docs/build/html
diff --git a/Pipfile b/Pipfile
index 8cdaf62..5b15106 100644
--- a/Pipfile
+++ b/Pipfile
@@ -9,7 +9,6 @@ pytest-pythonpath = "*"
 flake8 = "*"
 Sphinx = "*"
 sphinx_rtd_theme = "*"
-sphinx-autobuild = "*"
 
 [packages]
 six = "*"
diff --git a/Pipfile.lock b/Pipfile.lock
index ce5693e..1bf1a27 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,20 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "024c1ef70510227796ecb1ff0dab741edcc5a37656351e1f1be4271bc03f211d"
+            "sha256": "83f04e30541e4a01fd33895a0a4549739eb8d1270764752ea89262bd66ce04c5"
+        },
+        "host-environment-markers": {
+            "implementation_name": "pypy",
+            "implementation_version": "3.5.3",
+            "os_name": "posix",
+            "platform_machine": "x86_64",
+            "platform_python_implementation": "PyPy",
+            "platform_release": "16.7.0",
+            "platform_system": "Darwin",
+            "platform_version": "Darwin Kernel Version 16.7.0: Thu Jun 15 17:36:27 PDT 2017; root:xnu-3789.70.16~2/RELEASE_X86_64",
+            "python_full_version": "3.5.3",
+            "python_version": "3.5",
+            "sys_platform": "darwin"
         },
         "pipfile-spec": 1,
         "requires": {},
@@ -21,9 +34,6 @@
         "alabaster": {
             "version": "==0.7.10"
         },
-        "argh": {
-            "version": "==0.26.2"
-        },
         "babel": {
             "version": "==2.5.0"
         },
@@ -51,21 +61,12 @@
         "jinja2": {
             "version": "==2.9.6"
         },
-        "livereload": {
-            "version": "==2.5.1"
-        },
         "markupsafe": {
             "version": "==1.0"
         },
         "mccabe": {
             "version": "==0.6.1"
         },
-        "pathtools": {
-            "version": "==0.1.2"
-        },
-        "port-for": {
-            "version": "==0.3.1"
-        },
         "py": {
             "version": "==1.4.34"
         },
@@ -90,9 +91,6 @@
         "pytz": {
             "version": "==2017.2"
         },
-        "pyyaml": {
-            "version": "==3.12"
-        },
         "requests": {
             "version": "==2.18.4"
         },
@@ -105,23 +103,14 @@
         "sphinx": {
             "version": "==1.6.3"
         },
-        "sphinx-autobuild": {
-            "version": "==0.7.1"
-        },
         "sphinx-rtd-theme": {
             "version": "==0.2.4"
         },
         "sphinxcontrib-websupport": {
             "version": "==1.0.1"
         },
-        "tornado": {
-            "version": "==4.5.2"
-        },
         "urllib3": {
             "version": "==1.22"
-        },
-        "watchdog": {
-            "version": "==0.8.3"
         }
     }
 }