diff --git a/.gitignore b/.gitignore
index 6009346..5d454ed 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 .ipynb_checkpoints
 deps/build.log
+Manifest.toml
 
diff --git a/.travis.yml b/.travis.yml
index d9b54d1..0c7e97f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,9 @@ matrix:
     - os: linux
       julia: 1.1
       env: TESTCMD="xvfb-run julia"
+    - os: linux
+      julia: 1.2
+      env: TESTCMD="xvfb-run julia"
     - os: linux
       julia: nightly
       env: TESTCMD="xvfb-run julia"
@@ -39,6 +42,8 @@ before_install:
 
 script:
   - julia --color=yes -e "using Pkg; if VERSION >= v\"1.1.0-rc1\"; Pkg.build(verbose=true); else Pkg.build(); end"
+  # work-around for https://github.com/JuliaWeb/MbedTLS.jl/issues/193
+  - julia --color=yes -e "using Pkg; if VERSION >= v\"1.2.0\"; Pkg.update(\"MbedTLS\"); end"
   - $TESTCMD --check-bounds=yes --color=yes -e 'using Pkg; Pkg.test("MeshCat", coverage=true)'
   - julia --color=yes -e 'using MeshCat; MeshCat.develop_meshcat_assets(true)'
   - julia --color=yes -e 'import Pkg; Pkg.build("MeshCat")'
diff --git a/Manifest.toml b/Manifest.toml
deleted file mode 100644
index cf75e4f..0000000
--- a/Manifest.toml
+++ /dev/null
@@ -1,315 +0,0 @@
-# This file is machine-generated - editing it directly is not advised
-
-[[AssetRegistry]]
-deps = ["Distributed", "JSON", "Pidfile", "SHA", "Test"]
-git-tree-sha1 = "b25e88db7944f98789130d7b503276bc34bc098e"
-uuid = "bf4720bc-e11a-5d0c-854e-bdca1663c893"
-version = "0.1.0"
-
-[[Base64]]
-uuid = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
-
-[[BinDeps]]
-deps = ["Compat", "Libdl", "SHA", "URIParser"]
-git-tree-sha1 = "12093ca6cdd0ee547c39b1870e0c9c3f154d9ca9"
-uuid = "9e28174c-4ba2-5203-b857-d8d62c4213ee"
-version = "0.8.10"
-
-[[BinaryProvider]]
-deps = ["Libdl", "Logging", "SHA"]
-git-tree-sha1 = "c7361ce8a2129f20b0e05a89f7070820cfed6648"
-uuid = "b99e7846-7c00-51b0-8f62-c81ae34c0232"
-version = "0.5.6"
-
-[[CSTParser]]
-deps = ["Tokenize"]
-git-tree-sha1 = "376a39f1862000442011390f1edf5e7f4dcc7142"
-uuid = "00ebfdb7-1f24-5e51-bd34-a7502290713f"
-version = "0.6.0"
-
-[[Cassette]]
-git-tree-sha1 = "09aed2c4093e9ed29b08f6660ad959fcb6847cd1"
-uuid = "7057c7e9-c182-5462-911a-8362d720325c"
-version = "0.2.5"
-
-[[ColorTypes]]
-deps = ["FixedPointNumbers", "Random"]
-git-tree-sha1 = "10050a24b09e8e41b951e9976b109871ce98d965"
-uuid = "3da002f7-5984-5a60-b8a6-cbb66c0b333f"
-version = "0.8.0"
-
-[[Colors]]
-deps = ["ColorTypes", "FixedPointNumbers", "InteractiveUtils", "Printf", "Reexport", "Test"]
-git-tree-sha1 = "9f0a0210450acb91c730b730a994f8eef1d3d543"
-uuid = "5ae59095-9a9b-59fe-a467-6f913c188581"
-version = "0.9.5"
-
-[[Compat]]
-deps = ["Base64", "Dates", "DelimitedFiles", "Distributed", "InteractiveUtils", "LibGit2", "Libdl", "LinearAlgebra", "Markdown", "Mmap", "Pkg", "Printf", "REPL", "Random", "Serialization", "SharedArrays", "Sockets", "SparseArrays", "Statistics", "Test", "UUIDs", "Unicode"]
-git-tree-sha1 = "84aa74986c5b9b898b0d1acaf3258741ee64754f"
-uuid = "34da2185-b29b-5c13-b0c7-acf172513d20"
-version = "2.1.0"
-
-[[CoordinateTransformations]]
-deps = ["Compat", "Rotations", "StaticArrays"]
-git-tree-sha1 = "47f05d0b7f4999609f92e657147df000818c1f24"
-uuid = "150eb455-5306-5404-9cee-2592286d6298"
-version = "0.5.0"
-
-[[DataStructures]]
-deps = ["InteractiveUtils", "OrderedCollections"]
-git-tree-sha1 = "0809951a1774dc724da22d26e4289bbaab77809a"
-uuid = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"
-version = "0.17.0"
-
-[[Dates]]
-deps = ["Printf"]
-uuid = "ade2ca70-3891-5945-98fb-dc099432e06a"
-
-[[DelimitedFiles]]
-deps = ["Mmap"]
-uuid = "8bb1440f-4735-579b-a4ab-409b98df4dab"
-
-[[Distributed]]
-deps = ["Random", "Serialization", "Sockets"]
-uuid = "8ba89e20-285c-5b6f-9357-94700520ee1b"
-
-[[DocStringExtensions]]
-deps = ["LibGit2", "Markdown", "Pkg", "Test"]
-git-tree-sha1 = "0513f1a8991e9d83255e0140aace0d0fc4486600"
-uuid = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"
-version = "0.8.0"
-
-[[FileWatching]]
-uuid = "7b1f6079-737a-58dc-b8bc-7a2ca5c1b5ee"
-
-[[FixedPointNumbers]]
-git-tree-sha1 = "d14a6fa5890ea3a7e5dcab6811114f132fec2b4b"
-uuid = "53c48c17-4a7d-5ca2-90c5-79b7896eea93"
-version = "0.6.1"
-
-[[FunctionalCollections]]
-deps = ["Test"]
-git-tree-sha1 = "04cb9cfaa6ba5311973994fe3496ddec19b6292a"
-uuid = "de31a74c-ac4f-5751-b3fd-e18cd04993ca"
-version = "0.5.0"
-
-[[GeometryTypes]]
-deps = ["ColorTypes", "FixedPointNumbers", "IterTools", "LinearAlgebra", "StaticArrays"]
-git-tree-sha1 = "2b0bfb379a54bdfcd2942f388f7d045f8952373d"
-uuid = "4d00f742-c7ba-57c2-abde-4428a4b178cb"
-version = "0.7.5"
-
-[[HTTP]]
-deps = ["Base64", "Dates", "IniFile", "MbedTLS", "Sockets"]
-git-tree-sha1 = "03ddc88af7f2d963fac5aa9f3ac8e11914d68a78"
-uuid = "cd3eb016-35fb-5094-929b-558a96fad6f3"
-version = "0.8.4"
-
-[[Hiccup]]
-deps = ["MacroTools", "Test"]
-git-tree-sha1 = "6187bb2d5fcbb2007c39e7ac53308b0d371124bd"
-uuid = "9fb69e20-1954-56bb-a84f-559cc56a8ff7"
-version = "0.2.2"
-
-[[IniFile]]
-deps = ["Test"]
-git-tree-sha1 = "098e4d2c533924c921f9f9847274f2ad89e018b8"
-uuid = "83e8ac13-25f8-5344-8a64-a9f2b223428f"
-version = "0.5.0"
-
-[[InteractiveUtils]]
-deps = ["Markdown"]
-uuid = "b77e0a4c-d291-57a0-90e8-8db25a27a240"
-
-[[IterTools]]
-git-tree-sha1 = "2ebe60d7343962966d1779a74a760f13217a6901"
-uuid = "c8e1da08-722c-5040-9ed9-7db0dc04731e"
-version = "1.2.0"
-
-[[JSExpr]]
-deps = ["JSON", "MacroTools", "Observables", "Test", "WebIO"]
-git-tree-sha1 = "013bc2143a2e84ea489365cf30db3407deb540c2"
-uuid = "97c1335a-c9c5-57fe-bc5d-ec35cebe8660"
-version = "0.5.0"
-
-[[JSON]]
-deps = ["Dates", "Distributed", "Mmap", "Sockets", "Test", "Unicode"]
-git-tree-sha1 = "1f7a25b53ec67f5e9422f1f551ee216503f4a0fa"
-uuid = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
-version = "0.20.0"
-
-[[Lazy]]
-deps = ["Compat", "MacroTools", "Test"]
-git-tree-sha1 = "aec38c7e7f255a678af22651c74100e3cd39ea20"
-uuid = "50d2b5c4-7a5e-59d5-8109-a42b560f39c0"
-version = "0.13.2"
-
-[[LibGit2]]
-uuid = "76f85450-5226-5b5a-8eaa-529ad045b433"
-
-[[Libdl]]
-uuid = "8f399da3-3557-5675-b5ff-fb832c97cbdb"
-
-[[LinearAlgebra]]
-deps = ["Libdl"]
-uuid = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
-
-[[Logging]]
-uuid = "56ddb016-857b-54e1-b83d-db4d58db5568"
-
-[[MacroTools]]
-deps = ["CSTParser", "Compat", "DataStructures", "Test", "Tokenize"]
-git-tree-sha1 = "d6e9dedb8c92c3465575442da456aec15a89ff76"
-uuid = "1914dd2f-81c6-5fcd-8719-6d5c9610ff09"
-version = "0.5.1"
-
-[[Markdown]]
-deps = ["Base64"]
-uuid = "d6f4376e-aef5-505a-96c1-9c027394607a"
-
-[[MbedTLS]]
-deps = ["BinaryProvider", "Dates", "Distributed", "Libdl", "Random", "Sockets", "Test"]
-git-tree-sha1 = "2d94286a9c2f52c63a16146bb86fd6cdfbf677c6"
-uuid = "739be429-bea8-5141-9913-cc70e7f3736d"
-version = "0.6.8"
-
-[[Mmap]]
-uuid = "a63ad114-7e13-5084-954f-fe012c677804"
-
-[[MsgPack]]
-deps = ["Compat", "Random", "Test"]
-git-tree-sha1 = "c44b3470fa98705f9c12cb44ec9504de3af027ad"
-uuid = "99f44e22-a591-53d1-9472-aa23ef4bd671"
-version = "0.2.0"
-
-[[Mux]]
-deps = ["AssetRegistry", "Base64", "HTTP", "Hiccup", "Lazy", "Pkg", "Sockets", "Test", "WebSockets"]
-git-tree-sha1 = "5b41f03d63400c290bab4e1a49fb9ac36de1084a"
-uuid = "a975b10e-0019-58db-a62f-e48ff68538c9"
-version = "0.7.0"
-
-[[Observables]]
-deps = ["Test"]
-git-tree-sha1 = "dc02cec22747d1d10d9f70d8a1c03432b5bfbcd0"
-uuid = "510215fc-4207-5dde-b226-833fc4488ee2"
-version = "0.2.3"
-
-[[OrderedCollections]]
-deps = ["Random", "Serialization", "Test"]
-git-tree-sha1 = "c4c13474d23c60d20a67b217f1d7f22a40edf8f1"
-uuid = "bac558e1-5e72-5ebc-8fee-abe8a469f55d"
-version = "1.1.0"
-
-[[Parameters]]
-deps = ["Markdown", "OrderedCollections", "REPL", "Test"]
-git-tree-sha1 = "70bdbfb2bceabb15345c0b54be4544813b3444e4"
-uuid = "d96e819e-fc66-5662-9728-84c9c7592b0a"
-version = "0.10.3"
-
-[[Pidfile]]
-deps = ["FileWatching", "Test"]
-git-tree-sha1 = "1ffd82728498b5071cde851bbb7abd780d4445f3"
-uuid = "fa939f87-e72e-5be4-a000-7fc836dbe307"
-version = "1.1.0"
-
-[[Pkg]]
-deps = ["Dates", "LibGit2", "Markdown", "Printf", "REPL", "Random", "SHA", "UUIDs"]
-uuid = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
-
-[[Printf]]
-deps = ["Unicode"]
-uuid = "de0858da-6303-5e67-8744-51eddeeeb8d7"
-
-[[REPL]]
-deps = ["InteractiveUtils", "Markdown", "Sockets"]
-uuid = "3fa0cd96-eef1-5676-8a61-b3b8758bbffb"
-
-[[Random]]
-deps = ["Serialization"]
-uuid = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
-
-[[Reexport]]
-deps = ["Pkg"]
-git-tree-sha1 = "7b1d07f411bc8ddb7977ec7f377b97b158514fe0"
-uuid = "189a3867-3050-52da-a836-e630ba90ab69"
-version = "0.2.0"
-
-[[Requires]]
-deps = ["Test"]
-git-tree-sha1 = "f6fbf4ba64d295e146e49e021207993b6b48c7d1"
-uuid = "ae029012-a4dd-5104-9daa-d747884805df"
-version = "0.5.2"
-
-[[Rotations]]
-deps = ["LinearAlgebra", "Random", "StaticArrays", "Statistics", "Test"]
-git-tree-sha1 = "dfb3ceb177a59f25fee4e2f26c1aeb92b73d3a0e"
-uuid = "6038ab10-8711-5258-84ad-4b1120ba62dc"
-version = "0.11.1"
-
-[[SHA]]
-uuid = "ea8e919c-243c-51af-8825-aaa63cd721ce"
-
-[[Serialization]]
-uuid = "9e88b42a-f829-5b0c-bbe9-9e923198166b"
-
-[[SharedArrays]]
-deps = ["Distributed", "Mmap", "Random", "Serialization"]
-uuid = "1a1011a3-84de-559e-8e89-a11a2f7dc383"
-
-[[Sockets]]
-uuid = "6462fe0b-24de-5631-8697-dd941f90decc"
-
-[[SparseArrays]]
-deps = ["LinearAlgebra", "Random"]
-uuid = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
-
-[[StaticArrays]]
-deps = ["LinearAlgebra", "Random", "Statistics"]
-git-tree-sha1 = "db23bbf50064c582b6f2b9b043c8e7e98ea8c0c6"
-uuid = "90137ffa-7385-5640-81b9-e52037218182"
-version = "0.11.0"
-
-[[Statistics]]
-deps = ["LinearAlgebra", "SparseArrays"]
-uuid = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
-
-[[Test]]
-deps = ["Distributed", "InteractiveUtils", "Logging", "Random"]
-uuid = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
-
-[[Tokenize]]
-git-tree-sha1 = "0de343efc07da00cd449d5b04e959ebaeeb3305d"
-uuid = "0796e94c-ce3b-5d07-9a54-7f471281c624"
-version = "0.5.4"
-
-[[URIParser]]
-deps = ["Test", "Unicode"]
-git-tree-sha1 = "6ddf8244220dfda2f17539fa8c9de20d6c575b69"
-uuid = "30578b45-9adc-5946-b283-645ec420af67"
-version = "0.4.0"
-
-[[UUIDs]]
-deps = ["Random", "SHA"]
-uuid = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
-
-[[Unicode]]
-uuid = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
-
-[[WebIO]]
-deps = ["AssetRegistry", "Base64", "Compat", "Distributed", "FunctionalCollections", "JSON", "Logging", "Observables", "Random", "Requires", "Sockets", "UUIDs", "WebSockets", "Widgets"]
-git-tree-sha1 = "458ebbd85da851b01bed01e6321b0d8f4c7044b0"
-uuid = "0f1e0344-ec1d-5b48-a673-e5cf874b6c29"
-version = "0.8.6"
-
-[[WebSockets]]
-deps = ["Base64", "Dates", "Distributed", "HTTP", "Logging", "Random", "Sockets", "Test"]
-git-tree-sha1 = "13f763d38c7a05688938808b49cb29b18b60c8c8"
-uuid = "104b5d7c-a370-577a-8038-80a2059c5097"
-version = "1.5.2"
-
-[[Widgets]]
-deps = ["Colors", "Dates", "Observables", "OrderedCollections", "Test"]
-git-tree-sha1 = "c53befc70c6b91eaa2a9888c2f6ac2d92720a81b"
-uuid = "cc8bc4a8-27d6-5769-a93b-9d913e69aa62"
-version = "0.6.1"
diff --git a/Project.toml b/Project.toml
index ace0bc9..c34f384 100644
--- a/Project.toml
+++ b/Project.toml
@@ -26,11 +26,11 @@ WebIO = "0f1e0344-ec1d-5b48-a673-e5cf874b6c29"
 
 [compat]
 AssetRegistry = "0.1"
-Cassette = "≥ 0.2.5"
+Cassette = "0.2.5"
 GeometryTypes = "0.6, 0.7"
 JSExpr = "0.3, 0.5"
 Mux = "0.7"
-WebIO = "0.8"
+WebIO = "0.8.11"
 julia = "0.7, 1"
 
 [extras]
diff --git a/appveyor.yml b/appveyor.yml
index 699ba9d..65481e5 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -2,6 +2,7 @@ environment:
   matrix:
   - julia_version: 1
   - julia_version: 1.1
+  - julia_version: 1.2
   - julia_version: nightly
 
 platform:
diff --git a/deps/build.jl b/deps/build.jl
index c4be771..8f48c23 100644
--- a/deps/build.jl
+++ b/deps/build.jl
@@ -2,7 +2,7 @@ using Base.Filesystem
 using BinDeps: unpack_cmd, download_cmd
 
 
-const meshcat_sha = "3122cecd5da022ad96bb0c8dc0f811a1bc492350"
+const meshcat_sha = "2628e6020f510ffa8fef52123e2941f7fef39428"
 const meshcat_url = "https://github.com/rdeits/meshcat/archive/$meshcat_sha.zip"
 
 const assets_dir = normpath(joinpath(@__DIR__, "..", "assets"))
diff --git a/notebooks/Manifest.toml b/notebooks/Manifest.toml
deleted file mode 100644
index e178769..0000000
--- a/notebooks/Manifest.toml
+++ /dev/null
@@ -1,343 +0,0 @@
-# This file is machine-generated - editing it directly is not advised
-
-[[AssetRegistry]]
-deps = ["Distributed", "JSON", "Pidfile", "SHA", "Test"]
-git-tree-sha1 = "b25e88db7944f98789130d7b503276bc34bc098e"
-uuid = "bf4720bc-e11a-5d0c-854e-bdca1663c893"
-version = "0.1.0"
-
-[[Base64]]
-uuid = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
-
-[[BinDeps]]
-deps = ["Compat", "Libdl", "SHA", "URIParser"]
-git-tree-sha1 = "12093ca6cdd0ee547c39b1870e0c9c3f154d9ca9"
-uuid = "9e28174c-4ba2-5203-b857-d8d62c4213ee"
-version = "0.8.10"
-
-[[BinaryProvider]]
-deps = ["Libdl", "Logging", "SHA"]
-git-tree-sha1 = "c7361ce8a2129f20b0e05a89f7070820cfed6648"
-uuid = "b99e7846-7c00-51b0-8f62-c81ae34c0232"
-version = "0.5.6"
-
-[[CSTParser]]
-deps = ["Tokenize"]
-git-tree-sha1 = "376a39f1862000442011390f1edf5e7f4dcc7142"
-uuid = "00ebfdb7-1f24-5e51-bd34-a7502290713f"
-version = "0.6.0"
-
-[[Cassette]]
-git-tree-sha1 = "2f5d4d747eb39ce6410438993e00ccd5a0f4bc27"
-uuid = "7057c7e9-c182-5462-911a-8362d720325c"
-version = "0.2.4"
-
-[[ColorTypes]]
-deps = ["FixedPointNumbers", "Random"]
-git-tree-sha1 = "10050a24b09e8e41b951e9976b109871ce98d965"
-uuid = "3da002f7-5984-5a60-b8a6-cbb66c0b333f"
-version = "0.8.0"
-
-[[Colors]]
-deps = ["ColorTypes", "FixedPointNumbers", "InteractiveUtils", "Printf", "Reexport", "Test"]
-git-tree-sha1 = "9f0a0210450acb91c730b730a994f8eef1d3d543"
-uuid = "5ae59095-9a9b-59fe-a467-6f913c188581"
-version = "0.9.5"
-
-[[Compat]]
-deps = ["Base64", "Dates", "DelimitedFiles", "Distributed", "InteractiveUtils", "LibGit2", "Libdl", "LinearAlgebra", "Markdown", "Mmap", "Pkg", "Printf", "REPL", "Random", "Serialization", "SharedArrays", "Sockets", "SparseArrays", "Statistics", "Test", "UUIDs", "Unicode"]
-git-tree-sha1 = "84aa74986c5b9b898b0d1acaf3258741ee64754f"
-uuid = "34da2185-b29b-5c13-b0c7-acf172513d20"
-version = "2.1.0"
-
-[[CoordinateTransformations]]
-deps = ["Compat", "Rotations", "StaticArrays"]
-git-tree-sha1 = "47f05d0b7f4999609f92e657147df000818c1f24"
-uuid = "150eb455-5306-5404-9cee-2592286d6298"
-version = "0.5.0"
-
-[[DataStructures]]
-deps = ["InteractiveUtils", "OrderedCollections"]
-git-tree-sha1 = "0809951a1774dc724da22d26e4289bbaab77809a"
-uuid = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"
-version = "0.17.0"
-
-[[Dates]]
-deps = ["Printf"]
-uuid = "ade2ca70-3891-5945-98fb-dc099432e06a"
-
-[[DelimitedFiles]]
-deps = ["Mmap"]
-uuid = "8bb1440f-4735-579b-a4ab-409b98df4dab"
-
-[[Distributed]]
-deps = ["Random", "Serialization", "Sockets"]
-uuid = "8ba89e20-285c-5b6f-9357-94700520ee1b"
-
-[[DocStringExtensions]]
-deps = ["LibGit2", "Markdown", "Pkg", "Test"]
-git-tree-sha1 = "0513f1a8991e9d83255e0140aace0d0fc4486600"
-uuid = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"
-version = "0.8.0"
-
-[[FileIO]]
-deps = ["Pkg"]
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-version = "1.0.7"
-
-[[FileWatching]]
-uuid = "7b1f6079-737a-58dc-b8bc-7a2ca5c1b5ee"
-
-[[FixedPointNumbers]]
-git-tree-sha1 = "d14a6fa5890ea3a7e5dcab6811114f132fec2b4b"
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-[[FunctionalCollections]]
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-[[GeometryTypes]]
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-uuid = "4d00f742-c7ba-57c2-abde-4428a4b178cb"
-version = "0.7.5"
-
-[[HTTP]]
-deps = ["Base64", "Dates", "IniFile", "MbedTLS", "Sockets"]
-git-tree-sha1 = "03ddc88af7f2d963fac5aa9f3ac8e11914d68a78"
-uuid = "cd3eb016-35fb-5094-929b-558a96fad6f3"
-version = "0.8.4"
-
-[[Hiccup]]
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-
-[[IniFile]]
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-uuid = "83e8ac13-25f8-5344-8a64-a9f2b223428f"
-version = "0.5.0"
-
-[[InteractiveUtils]]
-deps = ["Markdown"]
-uuid = "b77e0a4c-d291-57a0-90e8-8db25a27a240"
-
-[[IterTools]]
-git-tree-sha1 = "2ebe60d7343962966d1779a74a760f13217a6901"
-uuid = "c8e1da08-722c-5040-9ed9-7db0dc04731e"
-version = "1.2.0"
-
-[[JSExpr]]
-deps = ["JSON", "MacroTools", "Observables", "Test", "WebIO"]
-git-tree-sha1 = "013bc2143a2e84ea489365cf30db3407deb540c2"
-uuid = "97c1335a-c9c5-57fe-bc5d-ec35cebe8660"
-version = "0.5.0"
-
-[[JSON]]
-deps = ["Dates", "Distributed", "Mmap", "Sockets", "Test", "Unicode"]
-git-tree-sha1 = "1f7a25b53ec67f5e9422f1f551ee216503f4a0fa"
-uuid = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
-version = "0.20.0"
-
-[[Lazy]]
-deps = ["Compat", "MacroTools", "Test"]
-git-tree-sha1 = "aec38c7e7f255a678af22651c74100e3cd39ea20"
-uuid = "50d2b5c4-7a5e-59d5-8109-a42b560f39c0"
-version = "0.13.2"
-
-[[LibGit2]]
-uuid = "76f85450-5226-5b5a-8eaa-529ad045b433"
-
-[[Libdl]]
-uuid = "8f399da3-3557-5675-b5ff-fb832c97cbdb"
-
-[[LinearAlgebra]]
-deps = ["Libdl"]
-uuid = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
-
-[[Logging]]
-uuid = "56ddb016-857b-54e1-b83d-db4d58db5568"
-
-[[MacroTools]]
-deps = ["CSTParser", "Compat", "DataStructures", "Test"]
-git-tree-sha1 = "daecd9e452f38297c686eba90dba2a6d5da52162"
-uuid = "1914dd2f-81c6-5fcd-8719-6d5c9610ff09"
-version = "0.5.0"
-
-[[Markdown]]
-deps = ["Base64"]
-uuid = "d6f4376e-aef5-505a-96c1-9c027394607a"
-
-[[MbedTLS]]
-deps = ["BinaryProvider", "Dates", "Distributed", "Libdl", "Random", "Sockets", "Test"]
-git-tree-sha1 = "2d94286a9c2f52c63a16146bb86fd6cdfbf677c6"
-uuid = "739be429-bea8-5141-9913-cc70e7f3736d"
-version = "0.6.8"
-
-[[MeshCat]]
-deps = ["AssetRegistry", "Base64", "BinDeps", "Cassette", "Colors", "CoordinateTransformations", "DocStringExtensions", "GeometryTypes", "JSExpr", "LinearAlgebra", "MsgPack", "Mux", "Parameters", "Requires", "Rotations", "Sockets", "StaticArrays", "UUIDs", "WebIO"]
-path = ".."
-uuid = "283c5d60-a78f-5afe-a0af-af636b173e11"
-version = "0.8.0"
-
-[[MeshIO]]
-deps = ["ColorTypes", "FileIO", "GeometryTypes", "Printf", "Test"]
-git-tree-sha1 = "3e01e12c4c626578a9d47fac0d15c9fe8dad5139"
-uuid = "7269a6da-0436-5bbc-96c2-40638cbb6118"
-version = "0.3.1"
-
-[[Meshing]]
-deps = ["GeometryTypes", "LinearAlgebra", "Profile", "Statistics", "Test"]
-git-tree-sha1 = "4a61ec51d3f1548f779ae46ff43638797a96de92"
-uuid = "e6723b4c-ebff-59f1-b4b7-d97aa5274f73"
-version = "0.4.1"
-
-[[Mmap]]
-uuid = "a63ad114-7e13-5084-954f-fe012c677804"
-
-[[MsgPack]]
-deps = ["Compat", "Random", "Test"]
-git-tree-sha1 = "c44b3470fa98705f9c12cb44ec9504de3af027ad"
-uuid = "99f44e22-a591-53d1-9472-aa23ef4bd671"
-version = "0.2.0"
-
-[[Mux]]
-deps = ["AssetRegistry", "Base64", "HTTP", "Hiccup", "Lazy", "Pkg", "Sockets", "Test", "WebSockets"]
-git-tree-sha1 = "5b41f03d63400c290bab4e1a49fb9ac36de1084a"
-uuid = "a975b10e-0019-58db-a62f-e48ff68538c9"
-version = "0.7.0"
-
-[[Observables]]
-deps = ["Test"]
-git-tree-sha1 = "dc02cec22747d1d10d9f70d8a1c03432b5bfbcd0"
-uuid = "510215fc-4207-5dde-b226-833fc4488ee2"
-version = "0.2.3"
-
-[[OrderedCollections]]
-deps = ["Random", "Serialization", "Test"]
-git-tree-sha1 = "c4c13474d23c60d20a67b217f1d7f22a40edf8f1"
-uuid = "bac558e1-5e72-5ebc-8fee-abe8a469f55d"
-version = "1.1.0"
-
-[[Parameters]]
-deps = ["Markdown", "OrderedCollections", "REPL", "Test"]
-git-tree-sha1 = "70bdbfb2bceabb15345c0b54be4544813b3444e4"
-uuid = "d96e819e-fc66-5662-9728-84c9c7592b0a"
-version = "0.10.3"
-
-[[Pidfile]]
-deps = ["FileWatching", "Test"]
-git-tree-sha1 = "1ffd82728498b5071cde851bbb7abd780d4445f3"
-uuid = "fa939f87-e72e-5be4-a000-7fc836dbe307"
-version = "1.1.0"
-
-[[Pkg]]
-deps = ["Dates", "LibGit2", "Markdown", "Printf", "REPL", "Random", "SHA", "UUIDs"]
-uuid = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
-
-[[Printf]]
-deps = ["Unicode"]
-uuid = "de0858da-6303-5e67-8744-51eddeeeb8d7"
-
-[[Profile]]
-deps = ["Printf"]
-uuid = "9abbd945-dff8-562f-b5e8-e1ebf5ef1b79"
-
-[[REPL]]
-deps = ["InteractiveUtils", "Markdown", "Sockets"]
-uuid = "3fa0cd96-eef1-5676-8a61-b3b8758bbffb"
-
-[[Random]]
-deps = ["Serialization"]
-uuid = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
-
-[[Reexport]]
-deps = ["Pkg"]
-git-tree-sha1 = "7b1d07f411bc8ddb7977ec7f377b97b158514fe0"
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-
-[[Requires]]
-deps = ["Test"]
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-version = "0.5.2"
-
-[[Rotations]]
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-git-tree-sha1 = "dfb3ceb177a59f25fee4e2f26c1aeb92b73d3a0e"
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-version = "0.11.1"
-
-[[SHA]]
-uuid = "ea8e919c-243c-51af-8825-aaa63cd721ce"
-
-[[Serialization]]
-uuid = "9e88b42a-f829-5b0c-bbe9-9e923198166b"
-
-[[SharedArrays]]
-deps = ["Distributed", "Mmap", "Random", "Serialization"]
-uuid = "1a1011a3-84de-559e-8e89-a11a2f7dc383"
-
-[[Sockets]]
-uuid = "6462fe0b-24de-5631-8697-dd941f90decc"
-
-[[SparseArrays]]
-deps = ["LinearAlgebra", "Random"]
-uuid = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
-
-[[StaticArrays]]
-deps = ["LinearAlgebra", "Random", "Statistics"]
-git-tree-sha1 = "db23bbf50064c582b6f2b9b043c8e7e98ea8c0c6"
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-version = "0.11.0"
-
-[[Statistics]]
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-uuid = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
-
-[[Test]]
-deps = ["Distributed", "InteractiveUtils", "Logging", "Random"]
-uuid = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
-
-[[Tokenize]]
-git-tree-sha1 = "0de343efc07da00cd449d5b04e959ebaeeb3305d"
-uuid = "0796e94c-ce3b-5d07-9a54-7f471281c624"
-version = "0.5.4"
-
-[[URIParser]]
-deps = ["Test", "Unicode"]
-git-tree-sha1 = "6ddf8244220dfda2f17539fa8c9de20d6c575b69"
-uuid = "30578b45-9adc-5946-b283-645ec420af67"
-version = "0.4.0"
-
-[[UUIDs]]
-deps = ["Random", "SHA"]
-uuid = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
-
-[[Unicode]]
-uuid = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
-
-[[WebIO]]
-deps = ["AssetRegistry", "Base64", "Compat", "Distributed", "FunctionalCollections", "JSON", "Logging", "Observables", "Random", "Requires", "Sockets", "UUIDs", "WebSockets", "Widgets"]
-git-tree-sha1 = "458ebbd85da851b01bed01e6321b0d8f4c7044b0"
-uuid = "0f1e0344-ec1d-5b48-a673-e5cf874b6c29"
-version = "0.8.6"
-
-[[WebSockets]]
-deps = ["Base64", "Dates", "Distributed", "HTTP", "Logging", "Random", "Sockets", "Test"]
-git-tree-sha1 = "13f763d38c7a05688938808b49cb29b18b60c8c8"
-uuid = "104b5d7c-a370-577a-8038-80a2059c5097"
-version = "1.5.2"
-
-[[Widgets]]
-deps = ["Colors", "Dates", "Observables", "OrderedCollections", "Test"]
-git-tree-sha1 = "c53befc70c6b91eaa2a9888c2f6ac2d92720a81b"
-uuid = "cc8bc4a8-27d6-5769-a93b-9d913e69aa62"
-version = "0.6.1"
diff --git a/notebooks/Project.toml b/notebooks/Project.toml
index 81164b6..8326ff3 100644
--- a/notebooks/Project.toml
+++ b/notebooks/Project.toml
@@ -6,3 +6,11 @@ GeometryTypes = "4d00f742-c7ba-57c2-abde-4428a4b178cb"
 MeshCat = "283c5d60-a78f-5afe-a0af-af636b173e11"
 MeshIO = "7269a6da-0436-5bbc-96c2-40638cbb6118"
 Meshing = "e6723b4c-ebff-59f1-b4b7-d97aa5274f73"
+
+[compat]
+Colors = "0.9"
+CoordinateTransformations = "0.5"
+FileIO = "1"
+GeometryTypes = "0.7"
+MeshIO = "0.3"
+Meshing = "0.4"
diff --git a/notebooks/animation.ipynb b/notebooks/animation.ipynb
index de9dbe4..1ca691b 100644
--- a/notebooks/animation.ipynb
+++ b/notebooks/animation.ipynb
@@ -19,9 +19,8 @@
    "source": [
     "# Optional: \n",
     "# These commands tell the Julia package manager to use the exact\n",
-    "# set of dependencies specified in the Project.toml and\n",
-    "# Manifest.toml files in this folder. That should\n",
-    "# give you a nice, reproducible environment for testing. \n",
+    "# set of dependencies specified in the Project.toml file in this folder. \n",
+    "# That should give you a nice, reproducible environment for testing. \n",
     "\n",
     "using Pkg\n",
     "Pkg.activate(@__DIR__)\n",
diff --git a/notebooks/demo.ipynb b/notebooks/demo.ipynb
index cf3c998..e3f30bc 100644
--- a/notebooks/demo.ipynb
+++ b/notebooks/demo.ipynb
@@ -17,9 +17,8 @@
    "source": [
     "# Optional: \n",
     "# These commands tell the Julia package manager to use the exact\n",
-    "# set of dependencies specified in the Project.toml and\n",
-    "# Manifest.toml files in this folder. That should\n",
-    "# give you a nice, reproducible environment for testing. \n",
+    "# set of dependencies specified in the Project.toml file in this folder. \n",
+    "# That should give you a nice, reproducible environment for testing. \n",
     "\n",
     "using Pkg\n",
     "Pkg.activate(@__DIR__)\n",
diff --git a/src/visualizer.jl b/src/visualizer.jl
index 9b3f12b..886ce36 100644
--- a/src/visualizer.jl
+++ b/src/visualizer.jl
@@ -7,7 +7,7 @@ mutable struct CoreVisualizer
     controls::Dict{String, Tuple{Observable, AbstractControl}}
 
     function CoreVisualizer()
-        scope = WebIO.Scope(imports=ASSET_KEYS)
+        scope = WebIO.Scope(imports=ASSET_KEYS, outbox=Channel{Any}(Inf))
         command_channel = Observable(scope, "meshcat-command", UInt8[])
         request_channel = Observable(scope, "meshcat-request", "")
         controls_channel = Observable(scope, "meshcat-controls", [])
@@ -115,16 +115,8 @@ end
 
 function Base.wait(c::CoreVisualizer)
     pool = c.scope.pool
-    while true
-        while isready(pool.new_connections)
-            push!(pool.connections, take!(pool.new_connections))
-        end
-        if !isempty(pool.connections)
-            break
-        else
-            sleep(0.25)
-        end
-    end
+    WebIO.ensure_connection(pool)
+    nothing
 end
 
 """