diff --git a/example/Pipfile b/example/Pipfile
index 010ab8a..7fb39aa 100644
--- a/example/Pipfile
+++ b/example/Pipfile
@@ -7,7 +7,7 @@ verify_ssl = true
 
 [packages]
 twirp = "==0.0.1.dev03"
-uvicorn = "==0.11.5"
+uvicorn = "==0.11.7"
 
 [requires]
 python_version = "3.8"
diff --git a/example/Pipfile.lock b/example/Pipfile.lock
index da95d6b..ad983de 100644
--- a/example/Pipfile.lock
+++ b/example/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "7d36c3c7e1f5b12c97aacba75f44f2e973d721d6b4498d88bfc88a5eb90da04d"
+            "sha256": "ab8c15e02cb526e3ce9001cc1075726563e254b6ad58122e17d1fd8a9b9eeab6"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -18,10 +18,10 @@
     "default": {
         "certifi": {
             "hashes": [
-                "sha256:1d987a998c75633c40847cc966fcf5904906c920a7f17ef374f5aa4282abd304",
-                "sha256:51fcb31174be6e6664c5f69e3e1691a2d72a1a12e90f872cbdb1567eb47b6519"
+                "sha256:5930595817496dd21bb8dc35dad090f1c2cd0adfaf21204bf6732ca5d8ee34d3",
+                "sha256:8fc0819f1f30ba15bdb34cceffb9ef04d99f420f68eb75d901e9560b8749fc41"
             ],
-            "version": "==2020.4.5.1"
+            "version": "==2020.6.20"
         },
         "chardet": {
             "hashes": [
@@ -64,45 +64,47 @@
         },
         "idna": {
             "hashes": [
-                "sha256:7588d1c14ae4c77d74036e8c22ff447b26d0fde8f007354fd48a7814db15b7cb",
-                "sha256:a068a21ceac8a4d63dbfd964670474107f541babbd2250d61922f029858365fa"
+                "sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6",
+                "sha256:b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0"
             ],
-            "version": "==2.9"
+            "version": "==2.10"
         },
         "protobuf": {
             "hashes": [
-                "sha256:00c2c276aca3af220d422e6a8625b1f5399c821c9b6f1c83e8a535aa8f48cc6c",
-                "sha256:0d69d76b00d0eb5124cb33a34a793383a5bbbf9ac3e633207c09988717c5da85",
-                "sha256:1c55277377dd35e508e9d86c67a545f6d8d242d792af487678eeb75c07974ee2",
-                "sha256:35bc1b96241b8ea66dbf386547ef2e042d73dcc0bf4b63566e3ef68722bb24d1",
-                "sha256:47a541ac44f2dcc8d49b615bcf3ed7ba4f33af9791118cecc3d17815fab652d9",
-                "sha256:61364bcd2d85277ab6155bb7c5267e6a64786a919f1a991e29eb536aa5330a3d",
-                "sha256:7aaa820d629f8a196763dd5ba21fd272fa038f775a845a52e21fa67862abcd35",
-                "sha256:9593a6cdfc491f2caf62adb1c03170e9e8748d0a69faa2b3970e39a92fbd05a2",
-                "sha256:95f035bbafec7dbaa0f1c72eda8108b763c1671fcb6e577e93da2d52eb47fbcf",
-                "sha256:9d6a517ce33cbdc64b52a17c56ce17b0b20679c945ed7420e7c6bc6686ff0494",
-                "sha256:a7532d971e4ab2019a9f6aa224b209756b6b9e702940ca85a4b1ed1d03f45396",
-                "sha256:b4e8ecb1eb3d011f0ccc13f8bb0a2d481aa05b733e6e22e9d46a3f61dbbef0de",
-                "sha256:bb1aced9dcebc46f0b320f24222cc8ffdfd2e47d2bafd4d2e5913cc6f7e3fc98",
-                "sha256:ccce142ebcfbc35643a5012cf398497eb18e8d021333cced4d5401f034a8cef5",
-                "sha256:d538eecc0b80accfb73c8167f39aaa167a5a50f31b1295244578c8eff8e9d602",
-                "sha256:eab18765eb5c7bad1b2de7ae3774192b46e1873011682e36bcd70ccf75f2748a"
+                "sha256:304e08440c4a41a0f3592d2a38934aad6919d692bb0edfb355548786728f9a5e",
+                "sha256:49ef8ab4c27812a89a76fa894fe7a08f42f2147078392c0dee51d4a444ef6df5",
+                "sha256:50b5fee674878b14baea73b4568dc478c46a31dd50157a5b5d2f71138243b1a9",
+                "sha256:5524c7020eb1fb7319472cb75c4c3206ef18b34d6034d2ee420a60f99cddeb07",
+                "sha256:612bc97e42b22af10ba25e4140963fbaa4c5181487d163f4eb55b0b15b3dfcd2",
+                "sha256:6f349adabf1c004aba53f7b4633459f8ca8a09654bf7e69b509c95a454755776",
+                "sha256:85b94d2653b0fdf6d879e39d51018bf5ccd86c81c04e18a98e9888694b98226f",
+                "sha256:87535dc2d2ef007b9d44e309d2b8ea27a03d2fa09556a72364d706fcb7090828",
+                "sha256:a7ab28a8f1f043c58d157bceb64f80e4d2f7f1b934bc7ff5e7f7a55a337ea8b0",
+                "sha256:a96f8fc625e9ff568838e556f6f6ae8eca8b4837cdfb3f90efcb7c00e342a2eb",
+                "sha256:b5a114ea9b7fc90c2cc4867a866512672a47f66b154c6d7ee7e48ddb68b68122",
+                "sha256:be04fe14ceed7f8641e30f36077c1a654ff6f17d0c7a5283b699d057d150d82a",
+                "sha256:bff02030bab8b969f4de597543e55bd05e968567acb25c0a87495a31eb09e925",
+                "sha256:c9ca9f76805e5a637605f171f6c4772fc4a81eced4e2f708f79c75166a2c99ea",
+                "sha256:e1464a4a2cf12f58f662c8e6421772c07947266293fb701cb39cd9c1e183f63c",
+                "sha256:e72736dd822748b0721f41f9aaaf6a5b6d5cfc78f6c8690263aef8bba4457f0e",
+                "sha256:eafe9fa19fcefef424ee089fb01ac7177ff3691af7cc2ae8791ae523eb6ca907",
+                "sha256:f4b73736108a416c76c17a8a09bc73af3d91edaa26c682aaa460ef91a47168d3"
             ],
-            "version": "==3.12.0"
+            "version": "==3.12.2"
         },
         "requests": {
             "hashes": [
-                "sha256:43999036bfa82904b6af1d99e4882b560e5e2c68e5c4b0aa03b655f3d7d73fee",
-                "sha256:b3f43d496c6daba4493e7c431722aeb7dbc6288f52a6e04e7b6023b0247817e6"
+                "sha256:b3559a131db72c33ee969480840fff4bb6dd111de7dd27c8ee1f820f4f00231b",
+                "sha256:fe75cc94a9443b9246fc7049224f75604b113c36acb93f87b80ed42c44cbb898"
             ],
-            "version": "==2.23.0"
+            "version": "==2.24.0"
         },
         "six": {
             "hashes": [
-                "sha256:236bdbdce46e6e6a3d61a337c0f8b763ca1e8717c03b369e87a7ec7ce1319c0a",
-                "sha256:8f3cd2e254d8f793e7f3d6d9df77b92252b52637291d0f0da013c76ea2724b6c"
+                "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259",
+                "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"
             ],
-            "version": "==1.14.0"
+            "version": "==1.15.0"
         },
         "structlog": {
             "hashes": [
@@ -121,18 +123,18 @@
         },
         "urllib3": {
             "hashes": [
-                "sha256:3018294ebefce6572a474f0604c2021e33b3fd8006ecd11d62107a5d2a963527",
-                "sha256:88206b0eb87e6d677d424843ac5209e3fb9d0190d0ee169599165ec25e9d9115"
+                "sha256:91056c15fa70756691db97756772bb1eb9678fa585d9184f24534b100dc60f4a",
+                "sha256:e7983572181f5e1522d9c98453462384ee92a0be7fac5f1413a1e35c56cc0461"
             ],
-            "version": "==1.25.9"
+            "version": "==1.25.10"
         },
         "uvicorn": {
             "hashes": [
-                "sha256:50577d599775dac2301bac8bd5b540d19a9560144143c5bdab13cba92783b6e7",
-                "sha256:596eaa8645b6dbc24d6610e335f8ddf5f925b4c4b86fdc7146abb0bf0da65d17"
+                "sha256:1d46a22cc55a52f5567e0c66f000ae56f26263e44cef59b7c885bf10f487ce6e",
+                "sha256:b50f7f4c0c499c9b8d0280924cfbd24b90ba02456e3dc80934b9a786a291f09f"
             ],
             "index": "pypi",
-            "version": "==0.11.5"
+            "version": "==0.11.7"
         },
         "uvloop": {
             "hashes": [