diff --git a/test/Makefile b/test/Makefile
index 244822b..6ba2e44 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -270,10 +270,8 @@
 	@rm -rf $(VENV_PATH)
 	@rm -rf $(patsubst %,%/__pycache__, $(VPP_TEST_DIRS) $(BUILD_TEST_SRC))
 
-$(TEST_DOC_BR):
+$(TEST_DOC_BR): $(PIP_INSTALL_DONE)
 	@mkdir -p $@
-	@bash -c "source $(VENV_PATH)/bin/activate && \
-		  $(PYTHON_INTERP) -m pip install sphinx sphinx-rtd-theme"
 	@bash -c "source $(VENV_PATH)/bin/activate && make -C doc html"
 
 .PHONY: doc
diff --git a/test/requirements-3.txt b/test/requirements-3.txt
index 77a3d35..a32dc6e 100644
--- a/test/requirements-3.txt
+++ b/test/requirements-3.txt
@@ -8,10 +8,6 @@
     --hash=sha256:446438bdcca0e05bd45ea2de1668c1d9b032e1a9154c2c259092d77031ddd359 \
     --hash=sha256:a661d72d58e6ea8a57f7a86e37d86716863ee5e92788398526d58b26a4e4dc02 \
     # via sphinx
-asn1crypto==0.24.0 \
-    --hash=sha256:2f1adbb7546ed199e3c90ef23ec95c5cf3585bac7d11fb7eb562a3fe89c64e87 \
-    --hash=sha256:9d5c20441baf0cb60a4ac34cc447c6c189024b6b4c6cd7877034f4965c464e49 \
-    # via cryptography
 babel==2.8.0 \
     --hash=sha256:1aac2ae2d0d8ea368fa90906567f5c08463d98ade155c0c4bfedd6a0f7160e38 \
     --hash=sha256:d670ea0b10f8b723672d3a6abeb87b565b244da220d76b4dba1b66269ec152d4 \
@@ -20,63 +16,66 @@
     --hash=sha256:1d987a998c75633c40847cc966fcf5904906c920a7f17ef374f5aa4282abd304 \
     --hash=sha256:51fcb31174be6e6664c5f69e3e1691a2d72a1a12e90f872cbdb1567eb47b6519 \
     # via requests
-cffi==1.12.3 \
-    --hash=sha256:041c81822e9f84b1d9c401182e174996f0bae9991f33725d059b771744290774 \
-    --hash=sha256:046ef9a22f5d3eed06334d01b1e836977eeef500d9b78e9ef693f9380ad0b83d \
-    --hash=sha256:066bc4c7895c91812eff46f4b1c285220947d4aa46fa0a2651ff85f2afae9c90 \
-    --hash=sha256:066c7ff148ae33040c01058662d6752fd73fbc8e64787229ea8498c7d7f4041b \
-    --hash=sha256:2444d0c61f03dcd26dbf7600cf64354376ee579acad77aef459e34efcb438c63 \
-    --hash=sha256:300832850b8f7967e278870c5d51e3819b9aad8f0a2c8dbe39ab11f119237f45 \
-    --hash=sha256:34c77afe85b6b9e967bd8154e3855e847b70ca42043db6ad17f26899a3df1b25 \
-    --hash=sha256:46de5fa00f7ac09f020729148ff632819649b3e05a007d286242c4882f7b1dc3 \
-    --hash=sha256:4aa8ee7ba27c472d429b980c51e714a24f47ca296d53f4d7868075b175866f4b \
-    --hash=sha256:4d0004eb4351e35ed950c14c11e734182591465a33e960a4ab5e8d4f04d72647 \
-    --hash=sha256:4e3d3f31a1e202b0f5a35ba3bc4eb41e2fc2b11c1eff38b362de710bcffb5016 \
-    --hash=sha256:50bec6d35e6b1aaeb17f7c4e2b9374ebf95a8975d57863546fa83e8d31bdb8c4 \
-    --hash=sha256:55cad9a6df1e2a1d62063f79d0881a414a906a6962bc160ac968cc03ed3efcfb \
-    --hash=sha256:5662ad4e4e84f1eaa8efce5da695c5d2e229c563f9d5ce5b0113f71321bcf753 \
-    --hash=sha256:59b4dc008f98fc6ee2bb4fd7fc786a8d70000d058c2bbe2698275bc53a8d3fa7 \
-    --hash=sha256:73e1ffefe05e4ccd7bcea61af76f36077b914f92b76f95ccf00b0c1b9186f3f9 \
-    --hash=sha256:a1f0fd46eba2d71ce1589f7e50a9e2ffaeb739fb2c11e8192aa2b45d5f6cc41f \
-    --hash=sha256:a2e85dc204556657661051ff4bab75a84e968669765c8a2cd425918699c3d0e8 \
-    --hash=sha256:a5457d47dfff24882a21492e5815f891c0ca35fefae8aa742c6c263dac16ef1f \
-    --hash=sha256:a8dccd61d52a8dae4a825cdbb7735da530179fea472903eb871a5513b5abbfdc \
-    --hash=sha256:ae61af521ed676cf16ae94f30fe202781a38d7178b6b4ab622e4eec8cefaff42 \
-    --hash=sha256:b012a5edb48288f77a63dba0840c92d0504aa215612da4541b7b42d849bc83a3 \
-    --hash=sha256:d2c5cfa536227f57f97c92ac30c8109688ace8fa4ac086d19d0af47d134e2909 \
-    --hash=sha256:d42b5796e20aacc9d15e66befb7a345454eef794fdb0737d1af593447c6c8f45 \
-    --hash=sha256:dee54f5d30d775f525894d67b1495625dd9322945e7fee00731952e0368ff42d \
-    --hash=sha256:e070535507bd6aa07124258171be2ee8dfc19119c28ca94c9dfb7efd23564512 \
-    --hash=sha256:e1ff2748c84d97b065cc95429814cdba39bcbd77c9c85c89344b317dc0d9cbff \
-    --hash=sha256:ed851c75d1e0e043cbf5ca9a8e1b13c4c90f3fbd863dacb01c0808e2b5204201
+cffi==1.14.0 \
+    --hash=sha256:001bf3242a1bb04d985d63e138230802c6c8d4db3668fb545fb5005ddf5bb5ff \
+    --hash=sha256:00789914be39dffba161cfc5be31b55775de5ba2235fe49aa28c148236c4e06b \
+    --hash=sha256:028a579fc9aed3af38f4892bdcc7390508adabc30c6af4a6e4f611b0c680e6ac \
+    --hash=sha256:14491a910663bf9f13ddf2bc8f60562d6bc5315c1f09c704937ef17293fb85b0 \
+    --hash=sha256:1cae98a7054b5c9391eb3249b86e0e99ab1e02bb0cc0575da191aedadbdf4384 \
+    --hash=sha256:2089ed025da3919d2e75a4d963d008330c96751127dd6f73c8dc0c65041b4c26 \
+    --hash=sha256:2d384f4a127a15ba701207f7639d94106693b6cd64173d6c8988e2c25f3ac2b6 \
+    --hash=sha256:337d448e5a725bba2d8293c48d9353fc68d0e9e4088d62a9571def317797522b \
+    --hash=sha256:399aed636c7d3749bbed55bc907c3288cb43c65c4389964ad5ff849b6370603e \
+    --hash=sha256:3b911c2dbd4f423b4c4fcca138cadde747abdb20d196c4a48708b8a2d32b16dd \
+    --hash=sha256:3d311bcc4a41408cf5854f06ef2c5cab88f9fded37a3b95936c9879c1640d4c2 \
+    --hash=sha256:62ae9af2d069ea2698bf536dcfe1e4eed9090211dbaafeeedf5cb6c41b352f66 \
+    --hash=sha256:66e41db66b47d0d8672d8ed2708ba91b2f2524ece3dee48b5dfb36be8c2f21dc \
+    --hash=sha256:675686925a9fb403edba0114db74e741d8181683dcf216be697d208857e04ca8 \
+    --hash=sha256:7e63cbcf2429a8dbfe48dcc2322d5f2220b77b2e17b7ba023d6166d84655da55 \
+    --hash=sha256:8a6c688fefb4e1cd56feb6c511984a6c4f7ec7d2a1ff31a10254f3c817054ae4 \
+    --hash=sha256:8c0ffc886aea5df6a1762d0019e9cb05f825d0eec1f520c51be9d198701daee5 \
+    --hash=sha256:95cd16d3dee553f882540c1ffe331d085c9e629499ceadfbda4d4fde635f4b7d \
+    --hash=sha256:99f748a7e71ff382613b4e1acc0ac83bf7ad167fb3802e35e90d9763daba4d78 \
+    --hash=sha256:b8c78301cefcf5fd914aad35d3c04c2b21ce8629b5e4f4e45ae6812e461910fa \
+    --hash=sha256:c420917b188a5582a56d8b93bdd8e0f6eca08c84ff623a4c16e809152cd35793 \
+    --hash=sha256:c43866529f2f06fe0edc6246eb4faa34f03fe88b64a0a9a942561c8e22f4b71f \
+    --hash=sha256:cab50b8c2250b46fe738c77dbd25ce017d5e6fb35d3407606e7a4180656a5a6a \
+    --hash=sha256:cef128cb4d5e0b3493f058f10ce32365972c554572ff821e175dbc6f8ff6924f \
+    --hash=sha256:cf16e3cf6c0a5fdd9bc10c21687e19d29ad1fe863372b5543deaec1039581a30 \
+    --hash=sha256:e56c744aa6ff427a607763346e4170629caf7e48ead6921745986db3692f987f \
+    --hash=sha256:e577934fc5f8779c554639376beeaa5657d54349096ef24abe8c74c5d9c117c3 \
+    --hash=sha256:f2b0fa0c01d8a0c7483afd9f31d7ecf2d71760ca24499c8697aeb5ca37dc090c
 chardet==3.0.4 \
     --hash=sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae \
     --hash=sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691 \
     # via requests
-click==7.0 \
-    --hash=sha256:2335065e6395b9e67ca716de5f7526736bfa6ceead690adf616d925bdc622b13 \
-    --hash=sha256:5b94b49521f6456670fdb30cd82a4eca9412788a93fa6dd6df72c94d5a8ff2d7 \
+click==7.1.1 \
+    --hash=sha256:8a18b4ea89d8820c5d0c7da8a64b2c324b4dabb695804dbfea19b9be9d88c0cc \
+    --hash=sha256:e345d143d80bf5ee7534056164e5e112ea5e22716bbb1ce727941f4c8b471b9a \
     # via pip-tools
-cryptography==2.7 \
-    --hash=sha256:24b61e5fcb506424d3ec4e18bca995833839bf13c59fc43e530e488f28d46b8c \
-    --hash=sha256:25dd1581a183e9e7a806fe0543f485103232f940fcfc301db65e630512cce643 \
-    --hash=sha256:3452bba7c21c69f2df772762be0066c7ed5dc65df494a1d53a58b683a83e1216 \
-    --hash=sha256:41a0be220dd1ed9e998f5891948306eb8c812b512dc398e5a01846d855050799 \
-    --hash=sha256:5751d8a11b956fbfa314f6553d186b94aa70fdb03d8a4d4f1c82dcacf0cbe28a \
-    --hash=sha256:5f61c7d749048fa6e3322258b4263463bfccefecb0dd731b6561cb617a1d9bb9 \
-    --hash=sha256:72e24c521fa2106f19623a3851e9f89ddfdeb9ac63871c7643790f872a305dfc \
-    --hash=sha256:7b97ae6ef5cba2e3bb14256625423413d5ce8d1abb91d4f29b6d1a081da765f8 \
-    --hash=sha256:961e886d8a3590fd2c723cf07be14e2a91cf53c25f02435c04d39e90780e3b53 \
-    --hash=sha256:96d8473848e984184b6728e2c9d391482008646276c3ff084a1bd89e15ff53a1 \
-    --hash=sha256:ae536da50c7ad1e002c3eee101871d93abdc90d9c5f651818450a0d3af718609 \
-    --hash=sha256:b0db0cecf396033abb4a93c95d1602f268b3a68bb0a9cc06a7cff587bb9a7292 \
-    --hash=sha256:cfee9164954c186b191b91d4193989ca994703b2fff406f71cf454a2d3c7327e \
-    --hash=sha256:e6347742ac8f35ded4a46ff835c60e68c22a536a8ae5c4422966d06946b6d4c6 \
-    --hash=sha256:f27d93f0139a3c056172ebb5d4f9056e770fdf0206c2f422ff2ebbad142e09ed \
-    --hash=sha256:f57b76e46a58b63d1c6375017f4564a28f19a5ca912691fd2e4261b3414b618d
-deprecation==2.0.6 \
-    --hash=sha256:68071e5ae7cd7e9da6c7dffd750922be4825c7c3a6780d29314076009cc39c35 \
-    --hash=sha256:fecd0f05024126466ba7e5309b905f09fce7d25d67e4648f7ec5488f9e764310
+cryptography==2.9 \
+    --hash=sha256:0cacd3ef5c604b8e5f59bf2582c076c98a37fe206b31430d0cd08138aff0986e \
+    --hash=sha256:192ca04a36852a994ef21df13cca4d822adbbdc9d5009c0f96f1d2929e375d4f \
+    --hash=sha256:19ae795137682a9778892fb4390c07811828b173741bce91e30f899424b3934d \
+    --hash=sha256:1b9b535d6b55936a79dbe4990b64bb16048f48747c76c29713fea8c50eca2acf \
+    --hash=sha256:2a2ad24d43398d89f92209289f15265107928f22a8d10385f70def7a698d6a02 \
+    --hash=sha256:3be7a5722d5bfe69894d3f7bbed15547b17619f3a88a318aab2e37f457524164 \
+    --hash=sha256:49870684da168b90110bbaf86140d4681032c5e6a2461adc7afdd93be5634216 \
+    --hash=sha256:587f98ce27ac4547177a0c6fe0986b8736058daffe9160dcf5f1bd411b7fbaa1 \
+    --hash=sha256:5aca6f00b2f42546b9bdf11a69f248d1881212ce5b9e2618b04935b87f6f82a1 \
+    --hash=sha256:6b744039b55988519cc183149cceb573189b3e46e16ccf6f8c46798bb767c9dc \
+    --hash=sha256:6b91cab3841b4c7cb70e4db1697c69f036c8bc0a253edc0baa6783154f1301e4 \
+    --hash=sha256:7598974f6879a338c785c513e7c5a4329fbc58b9f6b9a6305035fca5b1076552 \
+    --hash=sha256:7a279f33a081d436e90e91d1a7c338553c04e464de1c9302311a5e7e4b746088 \
+    --hash=sha256:95e1296e0157361fe2f5f0ed307fd31f94b0ca13372e3673fa95095a627636a1 \
+    --hash=sha256:9fc9da390e98cb6975eadf251b6e5fa088820141061bf041cd5c72deba1dc526 \
+    --hash=sha256:cc20316e3f5a6b582fc3b029d8dc03aabeb645acfcb7fc1d9848841a33265748 \
+    --hash=sha256:d1bf5a1a0d60c7f9a78e448adcb99aa101f3f9588b16708044638881be15d6bc \
+    --hash=sha256:ed1d0760c7e46436ec90834d6f10477ff09475c692ed1695329d324b2c5cd547 \
+    --hash=sha256:ef9a55013676907df6c9d7dd943eb1770d014f68beaa7e73250fb43c759f4585
+deprecation==2.0.7 \
+    --hash=sha256:c0392f676a6146f0238db5744d73e786a43510d54033f80994ef2f4c9df192ed \
+    --hash=sha256:dc9b4f252b7aca8165ce2764a71da92a653b5ffbf7a389461d7a640f6536ecb2
 docutils==0.16 \
     --hash=sha256:0c5b78adfbf7762415433f5515cd5c9e762339e23369dbe8000d84a4bf4ab3af \
     --hash=sha256:c2de3a60e9e7d07be26b7f2b00ca0309c207e06c100f9cc2a94931fc75a478fc \
@@ -85,12 +84,12 @@
     --hash=sha256:589f874b313739ad35be6e0cd7efde2a4e9b6fea91edcc34e58ecbb8dbe56d19 \
     --hash=sha256:c70dd71abe5a8c85e55e12c19bd91ccfeec11a6e99044204511f9ed547d48451 \
     # via flake8
-flake8==3.7.7 \
-    --hash=sha256:859996073f341f2670741b51ec1e67a01da142831aa1fdc6242dbf88dffbe661 \
-    --hash=sha256:a796a115208f5c03b18f332f7c11729812c8c3ded6c46319c59b53efd3819da8
-graphviz==0.11 \
-    --hash=sha256:6f261efbe92b938808ebb64048253b99f379f6300c6c776d440984e71678f642 \
-    --hash=sha256:fc6f825a2a1be9841c1c7493777c0c742514c7daf979691f0e143d7dc0cc1fa9 \
+flake8==3.7.9 \
+    --hash=sha256:45681a117ecc81e870cbf1262835ae4af5e7a8b08e40b944a8a6e6b895914cfb \
+    --hash=sha256:49356e766643ad15072a789a20915d3c91dc89fd313ccd71802303fd67e4deca
+graphviz==0.13.2 \
+    --hash=sha256:241fb099e32b8e8c2acca747211c8237e40c0b89f24b1622860075d59f4c4b25 \
+    --hash=sha256:60acbeee346e8c14555821eab57dbf68a169e6c10bce40e83c1bf44f63a62a01 \
     # via objgraph
 idna==2.9 \
     --hash=sha256:7588d1c14ae4c77d74036e8c22ff447b26d0fde8f007354fd48a7814db15b7cb \
@@ -149,29 +148,31 @@
 objgraph==3.4.1 \
     --hash=sha256:10d50116d1a66934d143a07308a5b3b3edcc021e1457f66ff792584166cae7cd \
     --hash=sha256:bf29512d7f8b457b53fa0722ea59f516abb8abc59b78f97f0ef81394a0c615a7
-packaging==19.0 \
-    --hash=sha256:0c98a5d0be38ed775798ece1b9727178c4469d9c3b4ada66e8e6b7849f8732af \
-    --hash=sha256:9e1cbf8c12b1f1ce0bb5344b8d7ecf66a6f8a6e91bcb0c84593ed6d3ab5c4ab3 \
+packaging==20.3 \
+    --hash=sha256:3c292b474fda1671ec57d46d739d072bfd495a4f51ad01a055121d81e952b7a3 \
+    --hash=sha256:82f77b9bee21c1bafbf35a84905d604d5d1223801d639cf3ed140bd651c08752 \
     # via deprecation, sphinx
-parameterized==0.7.0 \
-    --hash=sha256:020343a281efcfe9b71b9028a91817f981202c14d72104b5a2fbe401dee25a18 \
-    --hash=sha256:d8c8837fb677ed2d5a93b9e2308ce0da3aeb58cf513120d501e0b7af14da78d5
-pexpect==4.7.0 \
-    --hash=sha256:2094eefdfcf37a1fdbfb9aa090862c1a4878e5c7e0e7e7088bdb511c558e5cd1 \
-    --hash=sha256:9e2c1fd0e6ee3a49b28f95d4b33bc389c89b20af6a1255906e90ff1262ce62eb
+parameterized==0.7.1 \
+    --hash=sha256:6a94dbea30c6abde99fd4c2f2042c1bf7f980e48908bf92ead62394f93cf57ed \
+    --hash=sha256:ea0326ba5bbbe7c427329a27b75003410df07d1173ca254976f8f5a64922c322
+pexpect==4.8.0 \
+    --hash=sha256:0b48a55dcb3c05f3329815901ea4fc1537514d6ba867a152b581d69ae3710937 \
+    --hash=sha256:fc65a43959d153d0114afe13997d439c22823a27cefceb5ff35c2178c6784c0c
 pip-tools==3.8.0 \
     --hash=sha256:1240b075af2aaf8231898a6cb0220a103a06182a239ebf4537920e5d02ad89c3 \
     --hash=sha256:e4f33c3c77954182ec6998d661b0c2749428d3b461c0247d28ee67493a1c90ef
-psutil==5.6.3 \
-    --hash=sha256:028a1ec3c6197eadd11e7b46e8cc2f0720dc18ac6d7aabdb8e8c0d6c9704f000 \
-    --hash=sha256:503e4b20fa9d3342bcf58191bbc20a4a5ef79ca7df8972e6197cc14c5513e73d \
-    --hash=sha256:863a85c1c0a5103a12c05a35e59d336e1d665747e531256e061213e2e90f63f3 \
-    --hash=sha256:954f782608bfef9ae9f78e660e065bd8ffcfaea780f9f2c8a133bb7cb9e826d7 \
-    --hash=sha256:b6e08f965a305cd84c2d07409bc16fbef4417d67b70c53b299116c5b895e3f45 \
-    --hash=sha256:bc96d437dfbb8865fc8828cf363450001cb04056bbdcdd6fc152c436c8a74c61 \
-    --hash=sha256:cf49178021075d47c61c03c0229ac0c60d5e2830f8cab19e2d88e579b18cdb76 \
-    --hash=sha256:d5350cb66690915d60f8b233180f1e49938756fb2d501c93c44f8fb5b970cc63 \
-    --hash=sha256:eba238cf1989dfff7d483c029acb0ac4fcbfc15de295d682901f0e2497e6781a
+psutil==5.7.0 \
+    --hash=sha256:1413f4158eb50e110777c4f15d7c759521703bd6beb58926f1d562da40180058 \
+    --hash=sha256:298af2f14b635c3c7118fd9183843f4e73e681bb6f01e12284d4d70d48a60953 \
+    --hash=sha256:60b86f327c198561f101a92be1995f9ae0399736b6eced8f24af41ec64fb88d4 \
+    --hash=sha256:685ec16ca14d079455892f25bd124df26ff9137664af445563c1bd36629b5e0e \
+    --hash=sha256:73f35ab66c6c7a9ce82ba44b1e9b1050be2a80cd4dcc3352cc108656b115c74f \
+    --hash=sha256:75e22717d4dbc7ca529ec5063000b2b294fc9a367f9c9ede1f65846c7955fd38 \
+    --hash=sha256:a02f4ac50d4a23253b68233b07e7cdb567bd025b982d5cf0ee78296990c22d9e \
+    --hash=sha256:d008ddc00c6906ec80040d26dc2d3e3962109e40ad07fd8a12d0284ce5e0e4f8 \
+    --hash=sha256:d84029b190c8a66a946e28b4d3934d2ca1528ec94764b180f7d6ea57b0e75e26 \
+    --hash=sha256:e2d0c5b07c6fe5a87fa27b7855017edb0d52ee73b71e6ee368fae268605cc3f5 \
+    --hash=sha256:f344ca230dd8e8d5eee16827596f1c22ec0876127c28e800d7ae20ed44c4b310
 ptyprocess==0.6.0 \
     --hash=sha256:923f299cc5ad920c68f2bc0bc98b75b9f838b93b599941a6b63ddbc2476394c0 \
     --hash=sha256:d7cc528d76e76342423ca640335bd3633420dc1366f258cb31d05e865ef5ca1f \
@@ -179,8 +180,9 @@
 pycodestyle==2.5.0 \
     --hash=sha256:95a2219d12372f05704562a14ec30bc76b05a5b297b21a5dfe3f6fac3491ae56 \
     --hash=sha256:e40a936c9a450ad81df37f549d676d127b1b66000a6c500caa2b085bc0ca976c
-pycparser==2.19 \
-    --hash=sha256:a988718abfad80b6b157acce7bf130a30876d27603738ac39f140993246b25b3 \
+pycparser==2.20 \
+    --hash=sha256:2d475327684562c3a96cc71adf7dc8c4f0565175cf86b6d7a404ff4c771f15f0 \
+    --hash=sha256:7582ad22678f0fcd81102833f60ef8d0e57288b6b5fb00323d101be910e35705 \
     # via cffi
 pyflakes==2.1.1 \
     --hash=sha256:17dbeb2e3f4d772725c777fabc446d5634d1038f234e77343108ce445ea69ce0 \
@@ -190,11 +192,11 @@
     --hash=sha256:647344a061c249a3b74e230c739f434d7ea4d8b1d5f3721bc0f3558049b38f44 \
     --hash=sha256:ff7a40b4860b727ab48fad6360eb351cc1b33cbf9b15a0f689ca5353e9463324 \
     # via sphinx
-pympler==0.7 \
-    --hash=sha256:7a11e739125a9ce8bf868ded67238a40e8a7bf979bc03005eb8126182e5e274e
-pyparsing==2.4.0 \
-    --hash=sha256:1873c03321fc118f4e9746baf201ff990ceb915f433f23b395f5580d1840cb2a \
-    --hash=sha256:9b6323ef4ab914af344ba97510e966d64ba91055d6b9afa6b30799340e89cc03 \
+pympler==0.8 \
+    --hash=sha256:f74cd2982c5cd92ded55561191945616f2bb904a0ae5cdacdb566c6696bdb922
+pyparsing==2.4.7 \
+    --hash=sha256:c203ec8783bf771a155b207279b9bccb8dea02d8f0c9e5f8ead507bc3246ecc1 \
+    --hash=sha256:ef9d7589ef3c200abe66653d3f1ab1033c3c419ae9b9bdb1240a85b024efc88b \
     # via packaging
 pytz==2019.3 \
     --hash=sha256:1c557d7d0e871de1f5ccd5833f60fb2550652da6be2693c1e02300743d21500d \
@@ -206,13 +208,16 @@
     # via sphinx
 scapy==2.4.3 ; python_version >= "2.7" or python_version >= "3.4" \
     --hash=sha256:e2f8d11f6a941c14a789ae8b236b27bd634681f1b29b5e893861e284d234f6b0
-six==1.12.0 \
-    --hash=sha256:3350809f0555b11f552448330d0b52d5f24c91a322ea4a15ef22629740f3761c \
-    --hash=sha256:d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73
+six==1.14.0 \
+    --hash=sha256:236bdbdce46e6e6a3d61a337c0f8b763ca1e8717c03b369e87a7ec7ce1319c0a \
+    --hash=sha256:8f3cd2e254d8f793e7f3d6d9df77b92252b52637291d0f0da013c76ea2724b6c
 snowballstemmer==2.0.0 \
     --hash=sha256:209f257d7533fdb3cb73bdbd24f436239ca3b2fa67d56f6ff88e86be08cc5ef0 \
     --hash=sha256:df3bac3df4c2c01363f3dd2cfa78cce2840a79b9f1c2d2de9ce8d31683992f52 \
     # via sphinx
+sphinx-rtd-theme==0.4.3 \
+    --hash=sha256:00cf895504a7895ee433807c62094cf1e95f065843bf3acd17037c3e9a2becd4 \
+    --hash=sha256:728607e34d60456d736cc7991fd236afb828b21b82f956c5ea75f94c8414040a
 sphinx==2.4.4 \
     --hash=sha256:b4c750d546ab6d7e05bdff6ac24db8ae3e8b8253a3569b754e445110a0a12b66 \
     --hash=sha256:fc312670b56cb54920d6cc2ced455a22a547910de10b3142276495ced49231cb
@@ -243,9 +248,9 @@
 subprocess32==3.5.4 \
     --hash=sha256:88e37c1aac5388df41cc8a8456bb49ebffd321a3ad4d70358e3518176de3a56b \
     --hash=sha256:eb2937c80497978d181efa1b839ec2d9622cf9600a039a79d0e108d1f9aec79d
-syslog-rfc5424-parser==0.3.1 \
-    --hash=sha256:994dbb7b138ff175dd2e2a09ae487af4875cd608de9dcec25622c9b96fc0aa78 \
-    --hash=sha256:ff11d711d88d98538e1a0f1bd1a89449d3e88bc5abed66e3924b1a500869cb53
+syslog-rfc5424-parser==0.3.2 \
+    --hash=sha256:6134ee1958da89ab7f8d32ed5370a49ddabcc99d75a950b6ec59708417f20a7a \
+    --hash=sha256:80a9239d4da404a271266000f4c5f00a183af3d03d53d19d7052c8272430bee9
 urllib3==1.25.8 \
     --hash=sha256:2f3db8b19923a873b3e5256dc9c2dedfa883e33d87c690d9c7913e1f40673cdc \
     --hash=sha256:87716c2d2a7121198ebcb7ce7cccf6ce5e9ba539041cfbaeecfb641dc0bf6acc \
diff --git a/test/requirements.txt b/test/requirements.txt
index 40d5705..daeec3e 100644
--- a/test/requirements.txt
+++ b/test/requirements.txt
@@ -17,5 +17,5 @@
 syslog_rfc5424_parser>=0.3.1            # ISC
 objgraph                                # MIT
 pympler                                 # Apache-2.0
-# sphinx 3.0.0 crashes with a traceback
-sphinx<3.0.0
+sphinx<3.0.0                            # BSD,  sphinx 3.0.0 crashes with a traceback
+sphinx-rtd-theme                        # MIT