diff --git a/.dictionary b/.dictionary
index a246d1a990..5c873e9cc3 100644
--- a/.dictionary
+++ b/.dictionary
@@ -1,10 +1,11 @@
-personal_ws-1.1 en 251 utf-8
+personal_ws-1.1 en 252 utf-8
 AAR
 AARs
 ABI
 API's
 APIs
 APK
+AndroidX
 AppServices
 BUGFIX
 Bool
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b74610c3ae..d390cde62e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,13 +2,21 @@
 
 [Full changelog](https://github.com/mozilla/glean/compare/v51.4.0...main)
 
+* General
+  * Add `count` to `DistributionData` payload ([#2196](https://github.com/mozilla/glean/pull/2196))
+  * Update to UniFFI 0.21.0 ([#2229](https://github.com/mozilla/glean/pull/2229))
+* Android
+  * Synchronize AndroidX dependencies with AC ([#2219](https://github.com/mozilla/glean/pull/2219))
+  * Bump `jna` to 5.12.1 #2221 ([#2221](https://github.com/mozilla/glean/pull/2221))
+* iOS
+  * Glean for iOS is now being built with Xcode 14.0 ([#2188](https://github.com/mozilla/glean/pull/2188))
+
 # v51.4.0 (2022-10-04)
 
 [Full changelog](https://github.com/mozilla/glean/compare/v51.3.0...v51.4.0)
 
 * Kotlin
   * Update Kotlin and Android Gradle Plugin to the latest releases ([#2211](https://github.com/mozilla/glean/pull/2211))
-
 * Swift
   * Fix for iOS startup crash caused by Glean ([#2206](https://github.com/mozilla/glean/pull/2206))
 
@@ -22,9 +30,6 @@
   * Gradle plugin: Fix quoting issue in Python wrapper code ([#2193](https://github.com/mozilla/glean/pull/2193))
   * Bumped the required Android NDK to version 25.1.8937393 ([#2195](https://github.com/mozilla/glean/pull/2195))
 
-* iOS
-  * Glean for iOS is now being built with Xcode 14.0.0 ([#2188](https://github.com/mozilla/glean/pull/2188)).
-
 # v51.2.0 (2022-09-08)
 
 [Full changelog](https://github.com/mozilla/glean/compare/v51.1.0...v51.2.0)
diff --git a/Cargo.lock b/Cargo.lock
index 75c7493ee4..02415372c1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -8,11 +8,22 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "ahash"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcb51a0695d8f838b1ee009b3fbf66bda078cd64590202a864a8f3e8c4315c47"
+dependencies = [
+ "getrandom",
+ "once_cell",
+ "version_check",
+]
+
 [[package]]
 name = "aho-corasick"
-version = "0.7.18"
+version = "0.7.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e37cfd5e7657ada45f742d6e99ca5788580b5c529dc78faf11ece6dc702656f"
+checksum = "b4f55bd91a0978cbfd91c457a164bab8b4001c833b7f323132c0a4e1922dd44e"
 dependencies = [
  "memchr",
 ]
@@ -37,9 +48,9 @@ dependencies = [
 
 [[package]]
 name = "anyhow"
-version = "1.0.64"
+version = "1.0.65"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b9a8f622bcf6ff3df478e9deba3e03e4e04b300f8e6a139e192c05fa3490afc7"
+checksum = "98161a4e3e2184da77bb14f02184cdd111e83bbbcc9979dfee3c44b9a85f5602"
 
 [[package]]
 name = "arrayref"
@@ -138,9 +149,9 @@ checksum = "c4872d67bab6358e59559027aa3b9157c53d9358c51423c17554809a8858e0f8"
 
 [[package]]
 name = "camino"
-version = "1.0.9"
+version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "869119e97797867fd90f5e22af7d0bd274bd4635ebb9eb68c04f3f513ae6c412"
+checksum = "88ad0e1e3e88dd237a156ab9f571021b8a158caa0ae44b1968a241efb5144c1e"
 dependencies = [
  "serde",
 ]
@@ -195,16 +206,16 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "3.1.15"
+version = "3.2.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "85a35a599b11c089a7f49105658d089b8f2cf0882993c17daf6de15285c2c35d"
+checksum = "86447ad904c7fb335a790c9d7fe3d0d971dc523b8ccd1561a520de9a85302750"
 dependencies = [
  "atty",
  "bitflags",
  "clap_derive",
  "clap_lex",
  "indexmap",
- "lazy_static",
+ "once_cell",
  "strsim",
  "termcolor",
  "textwrap",
@@ -212,9 +223,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "3.1.7"
+version = "3.2.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a3aab4734e083b809aaf5794e14e756d1c798d2c69c7f7de7a09a2f5214993c1"
+checksum = "ea0c8bce528c4be4da13ea6fead8965e95b6073585a2f05204bd8f4119f82a65"
 dependencies = [
  "heck",
  "proc-macro-error",
@@ -225,9 +236,9 @@ dependencies = [
 
 [[package]]
 name = "clap_lex"
-version = "0.2.0"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a37c35f1112dad5e6e0b1adaff798507497a18fceeb30cceb3bae7d1427b9213"
+checksum = "2850f2f5a82cbf437dd5af4d49848fbdfc27c157c3d010345776f952765261c5"
 dependencies = [
  "os_str_bytes",
 ]
@@ -338,19 +349,19 @@ dependencies = [
 
 [[package]]
 name = "fs-err"
-version = "2.7.0"
+version = "2.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5bd79fa345a495d3ae89fb7165fec01c0e72f41821d642dda363a1e97975652e"
+checksum = "64db3e262960f0662f43a6366788d5f10f7f244b8f7d7d987f560baf5ded5c50"
 
 [[package]]
 name = "getrandom"
-version = "0.2.6"
+version = "0.2.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9be70c98951c83b8d2f8f60d7065fa6d5146873094452a1008da8c2f1e4205ad"
+checksum = "4eb1a864a501629691edf6c15a593b7a51eebaa1e8468e9ddc623de7c9b58ec6"
 dependencies = [
  "cfg-if",
  "libc",
- "wasi",
+ "wasi 0.11.0+wasi-snapshot-preview1",
 ]
 
 [[package]]
@@ -438,9 +449,12 @@ dependencies = [
 
 [[package]]
 name = "hashbrown"
-version = "0.11.2"
+version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ab5ef0d4909ef3724cc8cce6ccc8572c5c817592e9285f5464f8e86f8bd3726e"
+checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
+dependencies = [
+ "ahash",
+]
 
 [[package]]
 name = "heck"
@@ -482,9 +496,9 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "1.8.1"
+version = "1.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0f647032dfaa1f8b6dc29bd3edb7bbef4861b8b8007ebb118d6db284fd59f6ee"
+checksum = "10a35a97730320ffe8e2d410b5d3b69279b98d2c14bdb8b70ea89ecf7888d41e"
 dependencies = [
  "autocfg",
  "hashbrown",
@@ -536,9 +550,9 @@ dependencies = [
 
 [[package]]
 name = "itoa"
-version = "1.0.1"
+version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1aab8fc367588b89dcee83ab0fd66b72b50b72fa1904d7095045ace2b0c81c35"
+checksum = "4217ad341ebadf8d8e724e264f13e593e0648f5b3e94b3896a5df283be015ecc"
 
 [[package]]
 name = "json-pointer"
@@ -575,9 +589,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.125"
+version = "0.2.135"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5916d2ae698f6de9bfb891ad7a8d65c09d232dc58cc4ac433c7da3b2fd84bc2b"
+checksum = "68783febc7782c6c5cb401fbda4de5a9898be1762314da0bb2c10ced61f18b0c"
 
 [[package]]
 name = "lmdb-rkv"
@@ -710,9 +724,9 @@ dependencies = [
 
 [[package]]
 name = "os_str_bytes"
-version = "6.0.0"
+version = "6.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8e22443d1643a904602595ba1cd8f7d896afe56d26712531c5ff73a15b2fbf64"
+checksum = "9ff7415e9ae3fff1225851df9e0d9e4e5479f947619774677a63572e55e80eff"
 
 [[package]]
 name = "oslog"
@@ -727,9 +741,9 @@ dependencies = [
 
 [[package]]
 name = "paste"
-version = "1.0.7"
+version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c520e05135d6e763148b6426a837e239041653ba7becd2e538c076c738025fc"
+checksum = "b1de2e551fb905ac83f73f7aedf2f0cb4a0da7e35efa24a202a936269f1f18e1"
 
 [[package]]
 name = "percent-encoding"
@@ -775,9 +789,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.44"
+version = "1.0.47"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7bd7356a8122b6c4a24a82b278680c73357984ca2fc79a0f9fa6dea7dced7c58"
+checksum = "5ea3d908b0e36316caf9e9e2c4625cdde190a7e6f440d794667ed17a1855e725"
 dependencies = [
  "unicode-ident",
 ]
@@ -851,9 +865,9 @@ dependencies = [
 
 [[package]]
 name = "ryu"
-version = "1.0.9"
+version = "1.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "73b4b750c782965c211b42f022f59af1fbceabdd026623714f104152f1ec149f"
+checksum = "4501abdff3ae82a1c1b477a17252eb69cee9e66eb915c1abaa4f44d873df9f09"
 
 [[package]]
 name = "sample"
@@ -896,18 +910,18 @@ dependencies = [
 
 [[package]]
 name = "serde"
-version = "1.0.137"
+version = "1.0.145"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "61ea8d54c77f8315140a05f4c7237403bf38b72704d031543aa1d16abbf517d1"
+checksum = "728eb6351430bccb993660dfffc5a72f91ccc1295abaa8ce19b27ebe4f75568b"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.137"
+version = "1.0.145"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f26faba0c3959972377d3b2d306ee9f71faee9714294e41bb777f83f88578be"
+checksum = "81fa1584d3d1bcacd84c277a0dfe21f5b0f6accf4a23d04d4c6d61f1af522b4c"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -916,9 +930,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.81"
+version = "1.0.86"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b7ce2b32a1aed03c558dc61a5cd328f15aff2dbc17daad8fb8af04d2100e15c"
+checksum = "41feea4228a6f1cd09ec7a3593a682276702cd67b5273544757dae23c096f074"
 dependencies = [
  "itoa",
  "ryu",
@@ -945,9 +959,9 @@ checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
 
 [[package]]
 name = "syn"
-version = "1.0.101"
+version = "1.0.102"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e90cde112c4b9690b8cbe810cba9ddd8bc1d7472e2cae317b69e9438c1cba7d2"
+checksum = "3fcd952facd492f9be3ef0d0b7032a6e442ee9b361d4acc2b1d0c4aaa5f613a1"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -979,9 +993,9 @@ dependencies = [
 
 [[package]]
 name = "textwrap"
-version = "0.15.0"
+version = "0.15.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b1141d4d61095b28419e22cb0bbf02755f5e54e0526f97f1e3d1d160e60885fb"
+checksum = "949517c0cf1bf4ee812e2e07e08ab448e3ae0d23472aee8a06c985f0c8815b16"
 dependencies = [
  "smawk",
  "unicode-linebreak",
@@ -1015,7 +1029,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6db9e6914ab8b1ae1c260a4ae7a49b6c5611b40328a735b21862567685e73255"
 dependencies = [
  "libc",
- "wasi",
+ "wasi 0.10.0+wasi-snapshot-preview1",
  "winapi",
 ]
 
@@ -1060,16 +1074,17 @@ checksum = "099b7128301d285f79ddd55b9a83d5e6b9e97c92e0ea0daebee7263e932de992"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.4"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcc811dc4066ac62f84f11307873c4850cb653bfa9b1719cee2bd2204a4bc5dd"
+checksum = "6ceab39d59e4c9499d4e5a8ee0e2735b891bb7308ac83dfb4e80cad195c9f6f3"
 
 [[package]]
 name = "unicode-linebreak"
-version = "0.1.2"
+version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3a52dcaab0c48d931f7cc8ef826fa51690a08e1ea55117ef26f89864f532383f"
+checksum = "c5faade31a542b8b35855fff6e8def199853b2da8da256da52f52f1316ee3137"
 dependencies = [
+ "hashbrown",
  "regex",
 ]
 
@@ -1084,15 +1099,15 @@ dependencies = [
 
 [[package]]
 name = "unicode-width"
-version = "0.1.9"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3ed742d4ea2bd1176e236172c8429aaf54486e7ac098db29ffe6529e0ce50973"
+checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
 
 [[package]]
 name = "uniffi"
-version = "0.20.0"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3ff9d73a665e4e94d566f069fc0c6b92d13fc7de25ae128dd20402023884b551"
+checksum = "f54af5ada67d1173457a99a7bb44a7917f63e7466764cb4714865c7a6678b830"
 dependencies = [
  "anyhow",
  "bytes",
@@ -1107,9 +1122,9 @@ dependencies = [
 
 [[package]]
 name = "uniffi_bindgen"
-version = "0.20.0"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "195251b1b0dbb221759ea4d79e3090e5c08a60fc4040c9e945b255def155ea90"
+checksum = "12cc4af3c0180c7e86c4a3acf2b6587af04ba2567b1e948993df10f421796621"
 dependencies = [
  "anyhow",
  "askama",
@@ -1130,9 +1145,9 @@ dependencies = [
 
 [[package]]
 name = "uniffi_build"
-version = "0.20.0"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "74b65ae1c0bac70369bb0d9df6fae578b1ca130bf4cb6203e2636e2d6969dba5"
+checksum = "510287c368a9386eb731ebe824a6fc6c82a105e20d020af1aa20519c1c1561db"
 dependencies = [
  "anyhow",
  "camino",
@@ -1141,9 +1156,9 @@ dependencies = [
 
 [[package]]
 name = "uniffi_macros"
-version = "0.20.0"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5efddfb993c5b394a75042c0d144665388af2ad3db628401ab8f4fb6f6d07e54"
+checksum = "5c8604503caa2cbcf271578dc51ca236d40e3b22e1514ffa2e638e2c39f6ad10"
 dependencies = [
  "bincode",
  "camino",
@@ -1160,9 +1175,9 @@ dependencies = [
 
 [[package]]
 name = "uniffi_meta"
-version = "0.20.0"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fe1767e693cbd11fc22c37a4033d82eb9d891c3862e45329b4a891c1d8395df5"
+checksum = "cd9417cc653937681436b93838d8c5f97a5b8c58697813982ee8810bd1dc3b57"
 dependencies = [
  "serde",
 ]
@@ -1200,6 +1215,12 @@ version = "0.10.0+wasi-snapshot-preview1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
 
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
 [[package]]
 name = "weedle2"
 version = "4.0.0"
diff --git a/glean-core/Cargo.toml b/glean-core/Cargo.toml
index c0a2da1223..9691663e44 100644
--- a/glean-core/Cargo.toml
+++ b/glean-core/Cargo.toml
@@ -40,8 +40,8 @@ zeitstempel = "0.1.0"
 crossbeam-channel = "0.5"
 thiserror = "1.0.4"
 whatsys = "0.1.2"
-uniffi = "0.20.0"
-uniffi_macros = "0.20.0"
+uniffi = "0.21.0"
+uniffi_macros = "0.21.0"
 time = "0.1.40"
 
 [target.'cfg(target_os = "android")'.dependencies]
@@ -60,4 +60,4 @@ iso8601 = "0.4"
 ctor = "0.1.12"
 
 [build-dependencies]
-uniffi_build = { version = "0.20.0", features = ["builtin-bindgen"] }
+uniffi_build = { version = "0.21.0", features = ["builtin-bindgen"] }
diff --git a/tools/embedded-uniffi-bindgen/Cargo.toml b/tools/embedded-uniffi-bindgen/Cargo.toml
index 28a114d86a..138e16fc41 100644
--- a/tools/embedded-uniffi-bindgen/Cargo.toml
+++ b/tools/embedded-uniffi-bindgen/Cargo.toml
@@ -8,4 +8,4 @@ publish = false
 
 [dependencies]
 anyhow = "1"
-uniffi_bindgen = "0.20.0"
+uniffi_bindgen = "0.21.0"