diff --git a/Cargo.lock b/Cargo.lock
index b594293..a3c14fa 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4,9 +4,9 @@ version = 3
 
 [[package]]
 name = "addr2line"
-version = "0.16.0"
+version = "0.17.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3e61f2b7f93d2c7d2b08263acaa4a363b3e276806c68af6134c44f523bf1aacd"
+checksum = "b9ecd88a8c8378ca913a680cd98f0f13ac67383d35993f86c90a70e3f137816b"
 dependencies = [
  "gimli",
 ]
@@ -30,9 +30,9 @@ dependencies = [
 
 [[package]]
 name = "anyhow"
-version = "1.0.44"
+version = "1.0.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "61604a8f862e1d5c3229fdd78f8b02c68dcf73a4c4b05fd636d12240aaa242c1"
+checksum = "ee10e43ae4a853c0a3591d4e2ada1719e553be18199d9da9d4a83f5927c2f5c7"
 dependencies = [
  "backtrace",
 ]
@@ -85,13 +85,13 @@ checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
 
 [[package]]
 name = "backtrace"
-version = "0.3.62"
+version = "0.3.63"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "091bcdf2da9950f96aa522681ce805e6857f6ca8df73833d35736ab2dc78e152"
+checksum = "321629d8ba6513061f26707241fa9bc89524ff1cd7a915a97ef0c62c666ce1b6"
 dependencies = [
  "addr2line",
  "cc",
- "cfg-if",
+ "cfg-if 1.0.0",
  "libc",
  "miniz_oxide",
  "object",
@@ -154,6 +154,12 @@ version = "1.0.71"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "79c2681d6594606957bbb8631c4b90a7fcaaa72cdb714743a437b156d6a7eedd"
 
+[[package]]
+name = "cfg-if"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -234,12 +240,21 @@ version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4ae5588f6b3c3cb05239e90bd110f257254aecd01e4635400391aeae07497845"
 dependencies = [
- "cfg-if",
- "crossbeam-channel",
+ "cfg-if 1.0.0",
+ "crossbeam-channel 0.5.1",
  "crossbeam-deque",
  "crossbeam-epoch",
  "crossbeam-queue",
- "crossbeam-utils",
+ "crossbeam-utils 0.8.5",
+]
+
+[[package]]
+name = "crossbeam-channel"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8ec7fcd21571dc78f96cc96243cab8d8f035247c3efd16c687be154c3fa9efa"
+dependencies = [
+ "crossbeam-utils 0.6.6",
 ]
 
 [[package]]
@@ -248,8 +263,8 @@ version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06ed27e177f16d65f0f0c22a213e17c696ace5dd64b14258b52f9417ccb52db4"
 dependencies = [
- "cfg-if",
- "crossbeam-utils",
+ "cfg-if 1.0.0",
+ "crossbeam-utils 0.8.5",
 ]
 
 [[package]]
@@ -258,9 +273,9 @@ version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6455c0ca19f0d2fbf751b908d5c55c1f5cbc65e03c4225427254b46890bdde1e"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "crossbeam-epoch",
- "crossbeam-utils",
+ "crossbeam-utils 0.8.5",
 ]
 
 [[package]]
@@ -269,8 +284,8 @@ version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4ec02e091aa634e2c3ada4a392989e7c3116673ef0ac5b72232439094d73b7fd"
 dependencies = [
- "cfg-if",
- "crossbeam-utils",
+ "cfg-if 1.0.0",
+ "crossbeam-utils 0.8.5",
  "lazy_static",
  "memoffset",
  "scopeguard",
@@ -282,8 +297,18 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b10ddc024425c88c2ad148c1b0fd53f4c6d38db9697c9f1588381212fa657c9"
 dependencies = [
- "cfg-if",
- "crossbeam-utils",
+ "cfg-if 1.0.0",
+ "crossbeam-utils 0.8.5",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.6.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04973fa96e96579258a5091af6003abde64af786b860f18622b82e026cca60e6"
+dependencies = [
+ "cfg-if 0.1.10",
+ "lazy_static",
 ]
 
 [[package]]
@@ -292,7 +317,7 @@ version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d82cfc11ce7f2c3faef78d8a684447b40d503d9681acebed6cb728d45940c4db"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "lazy_static",
 ]
 
@@ -456,7 +481,7 @@ version = "0.2.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "975ccf83d8d9d0d84682850a38c8169027be83368805971cc4f238c2b245bc98"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "libc",
  "redox_syscall",
  "winapi",
@@ -630,16 +655,16 @@ version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7fcd999463524c52659517fe2cea98493cfe485d10565e7b0fb07dbba7ad2753"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "libc",
  "wasi",
 ]
 
 [[package]]
 name = "gimli"
-version = "0.25.0"
+version = "0.26.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0a01e0497841a3b2db4f8afa483cce65f7e96a3498bd6c541734792aeac8fe7"
+checksum = "78cc372d058dcf6d5ecd98510e7fbc9e5aec4d21de70f65fea8fecebcd881bd4"
 
 [[package]]
 name = "h2"
@@ -788,9 +813,9 @@ dependencies = [
 
 [[package]]
 name = "inotify"
-version = "0.9.5"
+version = "0.9.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9e5fc8f41dbaa9c8492a96c8afffda4f76896ee041d6a57606e70581b80c901f"
+checksum = "f8069d3ec154eb856955c1c0fbffefbf5f3c40a104ec912d4797314c1801abff"
 dependencies = [
  "bitflags",
  "inotify-sys",
@@ -812,7 +837,7 @@ version = "0.1.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7a5bbe824c507c5da5956355e86a746d82e0e1464f65d862cc5e71da70e94b2c"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
 ]
 
 [[package]]
@@ -867,9 +892,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.105"
+version = "0.2.106"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "869d572136620d55835903746bcb5cdc54cb2851fd0aeec53220b4bb65ef3013"
+checksum = "a60553f9a9e039a333b4e9b20573b9e9b9c0bb3a11e201ccc48ef4283456d673"
 
 [[package]]
 name = "libsqlite3-sys"
@@ -897,7 +922,7 @@ version = "0.4.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "51b9bbe6c47d51fc3e1a9b945965946b4c44142ab8792c50835a980d362c2710"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
 ]
 
 [[package]]
@@ -983,7 +1008,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "245d358380e2352c2d020e8ee62baac09b3420f1f6c012a31326cfced4ad487d"
 dependencies = [
  "bitflags",
- "crossbeam-channel",
+ "crossbeam-channel 0.5.1",
  "filetime",
  "fsevent-sys",
  "inotify",
@@ -1077,10 +1102,11 @@ dependencies = [
  "panorama-imap",
  "panorama-smtp",
  "serde",
+ "session_types",
  "sqlx",
  "stderrlog",
  "tokio",
- "tokio-rustls 0.23.0",
+ "tokio-rustls 0.23.1",
  "toml",
  "xdg",
 ]
@@ -1106,7 +1132,7 @@ dependencies = [
  "panorama-proto-common",
  "stderrlog",
  "tokio",
- "tokio-rustls 0.23.0",
+ "tokio-rustls 0.23.1",
  "tokio-util",
  "webpki-roots 0.22.1",
 ]
@@ -1157,7 +1183,7 @@ version = "0.8.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d76e8e1493bcac0d2766c42737f34458f1c8c50c0d23bcb24ea953affb273216"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "instant",
  "libc",
  "redox_syscall",
@@ -1387,6 +1413,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "session_types"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "149e4a189f59b63f351e9cc877ba983c03a322b95663ed58324e35be23aad7ac"
+dependencies = [
+ "crossbeam-channel 0.3.9",
+]
+
 [[package]]
 name = "sha2"
 version = "0.9.8"
@@ -1394,7 +1429,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b69f9a4c9740d74c5baa3fd2e547f9525fa8088a8a958e0ca2409a514e33f5fa"
 dependencies = [
  "block-buffer",
- "cfg-if",
+ "cfg-if 1.0.0",
  "cpufeatures",
  "digest",
  "opaque-debug",
@@ -1482,9 +1517,9 @@ dependencies = [
  "bytes",
  "chrono",
  "crc",
- "crossbeam-channel",
+ "crossbeam-channel 0.5.1",
  "crossbeam-queue",
- "crossbeam-utils",
+ "crossbeam-utils 0.8.5",
  "either",
  "futures-channel",
  "futures-core",
@@ -1663,9 +1698,9 @@ checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
 
 [[package]]
 name = "tokio"
-version = "1.12.0"
+version = "1.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c2c2416fdedca8443ae44b4527de1ea633af61d8f7169ffa6e72c5b53d24efcc"
+checksum = "588b2d10a336da58d877567cd8fb8a14b463e2104910f8132cd054b4b96e29ee"
 dependencies = [
  "autocfg",
  "bytes",
@@ -1683,9 +1718,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-macros"
-version = "1.5.0"
+version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b2dd85aeaba7b68df939bd357c6afb36c87951be9e80bf9c859f2fc3e9fca0fd"
+checksum = "114383b041aa6212c579467afa0075fbbdd0718de036100bc0ba7961d8cb9095"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1705,9 +1740,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-rustls"
-version = "0.23.0"
+version = "0.23.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d49194a46b06a69f2498a34a595ab4a9c1babd2642ffa3dbccf6c6778d1426f2"
+checksum = "4baa378e417d780beff82bf54ceb0d195193ea6a00c14e22359e7f39456b5689"
 dependencies = [
  "rustls 0.20.0",
  "tokio",
@@ -1716,9 +1751,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-stream"
-version = "0.1.7"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b2f3f698253f03119ac0102beaa64f67a67e08074d03a22d18784104543727f"
+checksum = "50145484efff8818b5ccd256697f36863f587da82cf8b409c53adf1e840798e3"
 dependencies = [
  "futures-core",
  "pin-project-lite",
@@ -1727,9 +1762,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-util"
-version = "0.6.8"
+version = "0.6.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "08d3725d3efa29485e87311c5b699de63cde14b00ed4d256b8318aa30ca452cd"
+checksum = "9e99e1983e5d376cd8eb4b66604d2e99e79f5bd988c3055891dcd8c9e2604cc0"
 dependencies = [
  "bytes",
  "futures-core",
@@ -1760,7 +1795,7 @@ version = "0.1.29"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "375a639232caf30edfc78e8d89b2d4c375515393e7af7e16f01cd96917fb2105"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "pin-project-lite",
  "tracing-core",
 ]
@@ -1897,7 +1932,7 @@ version = "0.2.78"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "632f73e236b219150ea279196e54e610f5dbafa5d61786303d4da54f84e47fce"
 dependencies = [
- "cfg-if",
+ "cfg-if 1.0.0",
  "wasm-bindgen-macro",
 ]
 
diff --git a/daemon/Cargo.toml b/daemon/Cargo.toml
index d278c36..cc2dc94 100644
--- a/daemon/Cargo.toml
+++ b/daemon/Cargo.toml
@@ -9,7 +9,7 @@ default = ["config-watch"]
 config-watch = ["notify"]
 
 [dependencies]
-anyhow = { version = "1.0.44", features = ["backtrace"] }
+anyhow = { version = "1.0.45", features = ["backtrace"] }
 async-trait = "0.1.51"
 clap = "3.0.0-beta.5"
 derivative = "2.2.0"
@@ -20,12 +20,13 @@ panorama-imap = { path = "../imap" }
 panorama-smtp = { path = "../smtp" }
 serde = { version = "1.0.130", features = ["derive"] }
 stderrlog = "0.5.1"
-tokio = { version = "1.12.0", features = ["full"] }
-tokio-rustls = "0.23.0"
+tokio = { version = "1.13.0", features = ["full"] }
+tokio-rustls = "0.23.1"
 toml = "0.5.8"
 xdg = "2.4.0"
 
 notify = { version = "5.0.0-pre.13", optional = true }
+session_types = "0.3.1"
 
 [dependencies.sqlx]
 version = "0.5.9"
diff --git a/imap/Cargo.toml b/imap/Cargo.toml
index 1b6312d..863f349 100644
--- a/imap/Cargo.toml
+++ b/imap/Cargo.toml
@@ -23,7 +23,7 @@ rfc6154 = [] # list
 fuzzing = ["arbitrary", "panorama-proto-common/fuzzing"]
 
 [dependencies]
-anyhow = { version = "1.0.44", features = ["backtrace"] }
+anyhow = { version = "1.0.45", features = ["backtrace"] }
 async-trait = "0.1.51"
 bitflags = "1.3.2"
 bytes = "1.1.0"
@@ -35,9 +35,9 @@ futures = "0.3.17"
 log = "0.4.14"
 nom = "7.0.0"
 stderrlog = { version = "0.5.1", optional = true }
-tokio = { version = "1.12.0", features = ["full"] }
-tokio-rustls = { version = "0.23.0", features = ["dangerous_configuration"] }
-tokio-util = { version = "0.6.8", features = ["codec"] }
+tokio = { version = "1.13.0", features = ["full"] }
+tokio-rustls = { version = "0.23.1", features = ["dangerous_configuration"] }
+tokio-util = { version = "0.6.9", features = ["codec"] }
 webpki-roots = "0.22.1"
 panorama-proto-common = { path = "../proto-common" }
 
diff --git a/proto-common/Cargo.toml b/proto-common/Cargo.toml
index f3ee6b2..9792964 100644
--- a/proto-common/Cargo.toml
+++ b/proto-common/Cargo.toml
@@ -13,7 +13,7 @@ default = []
 fuzzing = ["arbitrary"]
 
 [dependencies]
-anyhow = { version = "1.0.44", features = ["backtrace"] }
+anyhow = { version = "1.0.45", features = ["backtrace"] }
 bstr = "0.2.17"
 bytes = "1.1.0"
 format-bytes = "0.2.2"