diff --git a/.eslintrc.js b/.eslintrc.js
index 6f084a6c9c..259c86157b 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -237,7 +237,7 @@ module.exports = {
     'formatjs/no-offset': 'error',
     'formatjs/no-useless-message': 'error',
     'formatjs/prefer-formatted-message': 'error',
-    'formatjs/prefer-pound-in-plural': 'off', // Can be auto-fixed to replace `count` with the entity names
+    'formatjs/prefer-pound-in-plural': 'error',
   },
 
   overrides: [
diff --git a/app/javascript/mastodon/components/edited_timestamp/index.jsx b/app/javascript/mastodon/components/edited_timestamp/index.jsx
index 1513f93619..8a5417a7d9 100644
--- a/app/javascript/mastodon/components/edited_timestamp/index.jsx
+++ b/app/javascript/mastodon/components/edited_timestamp/index.jsx
@@ -32,7 +32,7 @@ class EditedTimestamp extends React.PureComponent {
 
   renderHeader = items => {
     return (
-      <FormattedMessage id='status.edited_x_times' defaultMessage='Edited {count, plural, one {{count} time} other {{count} times}}' values={{ count: items.size - 1 }} />
+      <FormattedMessage id='status.edited_x_times' defaultMessage='Edited {count, plural, one {# time} other {# times}}' values={{ count: items.size - 1 }} />
     );
   };
 
diff --git a/app/javascript/mastodon/components/hashtag.jsx b/app/javascript/mastodon/components/hashtag.jsx
index 94c61b6546..8821c66f02 100644
--- a/app/javascript/mastodon/components/hashtag.jsx
+++ b/app/javascript/mastodon/components/hashtag.jsx
@@ -43,7 +43,7 @@ class SilentErrorBoundary extends React.Component {
 export const accountsCountRenderer = (displayNumber, pluralReady) => (
   <FormattedMessage
     id='trends.counter_by_accounts'
-    defaultMessage='{count, plural, one {{counter} person} other {{counter} people}} in the past {days, plural, one {day} other {{days} days}}'
+    defaultMessage='{count, plural, one {{counter} person} other {{counter} people}} in the past {days, plural, one {day} other {# days}}'
     values={{
       count: pluralReady,
       counter: <strong>{displayNumber}</strong>,
diff --git a/app/javascript/mastodon/features/compose/components/search_results.jsx b/app/javascript/mastodon/features/compose/components/search_results.jsx
index 1dccd950cb..8fafd88b07 100644
--- a/app/javascript/mastodon/features/compose/components/search_results.jsx
+++ b/app/javascript/mastodon/features/compose/components/search_results.jsx
@@ -126,7 +126,7 @@ class SearchResults extends ImmutablePureComponent {
       <div className='search-results'>
         <div className='search-results__header'>
           <Icon id='search' fixedWidth />
-          <FormattedMessage id='search_results.total' defaultMessage='{count, number} {count, plural, one {result} other {results}}' values={{ count }} />
+          <FormattedMessage id='search_results.total' defaultMessage='{count, plural, one {# result} other {# results}}' values={{ count }} />
         </div>
 
         {accounts}
diff --git a/app/javascript/mastodon/features/notifications/components/report.jsx b/app/javascript/mastodon/features/notifications/components/report.jsx
index 4663b23597..a9decdc8e9 100644
--- a/app/javascript/mastodon/features/notifications/components/report.jsx
+++ b/app/javascript/mastodon/features/notifications/components/report.jsx
@@ -45,7 +45,7 @@ class Report extends ImmutablePureComponent {
 
         <div className='notification__report__details'>
           <div>
-            <RelativeTimestamp timestamp={report.get('created_at')} short={false} /> · <FormattedMessage id='report_notification.attached_statuses' defaultMessage='{count, plural, one {{count} post} other {{count} posts}} attached' values={{ count: report.get('status_ids').size }} />
+            <RelativeTimestamp timestamp={report.get('created_at')} short={false} /> · <FormattedMessage id='report_notification.attached_statuses' defaultMessage='{count, plural, one {# post} other {# posts}} attached' values={{ count: report.get('status_ids').size }} />
             <br />
             <strong>{intl.formatMessage(messages[report.get('category')])}</strong>
           </div>
diff --git a/app/javascript/mastodon/features/status/index.jsx b/app/javascript/mastodon/features/status/index.jsx
index 6f03362096..7f1896aedb 100644
--- a/app/javascript/mastodon/features/status/index.jsx
+++ b/app/javascript/mastodon/features/status/index.jsx
@@ -69,7 +69,7 @@ const messages = defineMessages({
   redraftMessage: { id: 'confirmations.redraft.message', defaultMessage: 'Are you sure you want to delete this status and re-draft it? Favourites and boosts will be lost, and replies to the original post will be orphaned.' },
   revealAll: { id: 'status.show_more_all', defaultMessage: 'Show more for all' },
   hideAll: { id: 'status.show_less_all', defaultMessage: 'Show less for all' },
-  statusTitleWithAttachments: { id: 'status.title.with_attachments', defaultMessage: '{user} posted {attachmentCount, plural, one {an attachment} other {{attachmentCount} attachments}}' },
+  statusTitleWithAttachments: { id: 'status.title.with_attachments', defaultMessage: '{user} posted {attachmentCount, plural, one {an attachment} other {# attachments}}' },
   detailedStatus: { id: 'status.detailed_status', defaultMessage: 'Detailed conversation view' },
   replyConfirm: { id: 'confirmations.reply.confirm', defaultMessage: 'Reply' },
   replyMessage: { id: 'confirmations.reply.message', defaultMessage: 'Replying now will overwrite the message you are currently composing. Are you sure you want to proceed?' },
diff --git a/app/javascript/mastodon/locales/defaultMessages.json b/app/javascript/mastodon/locales/defaultMessages.json
index b45b6e6f0e..6d16ecd834 100644
--- a/app/javascript/mastodon/locales/defaultMessages.json
+++ b/app/javascript/mastodon/locales/defaultMessages.json
@@ -249,7 +249,7 @@
   {
     "descriptors": [
       {
-        "defaultMessage": "Edited {count, plural, one {{count} time} other {{count} times}}",
+        "defaultMessage": "Edited {count, plural, one {# time} other {# times}}",
         "id": "status.edited_x_times"
       },
       {
@@ -299,7 +299,7 @@
   {
     "descriptors": [
       {
-        "defaultMessage": "{count, plural, one {{counter} person} other {{counter} people}} in the past {days, plural, one {day} other {{days} days}}",
+        "defaultMessage": "{count, plural, one {{counter} person} other {{counter} people}} in the past {days, plural, one {day} other {# days}}",
         "id": "trends.counter_by_accounts"
       }
     ],
@@ -1677,7 +1677,7 @@
         "id": "search_results.hashtags"
       },
       {
-        "defaultMessage": "{count, number} {count, plural, one {result} other {results}}",
+        "defaultMessage": "{count, plural, one {# result} other {# results}}",
         "id": "search_results.total"
       }
     ],
@@ -3144,7 +3144,7 @@
         "id": "report_notification.categories.violation"
       },
       {
-        "defaultMessage": "{count, plural, one {{count} post} other {{count} posts}} attached",
+        "defaultMessage": "{count, plural, one {# post} other {# posts}} attached",
         "id": "report_notification.attached_statuses"
       }
     ],
@@ -3818,7 +3818,7 @@
         "id": "status.show_less_all"
       },
       {
-        "defaultMessage": "{user} posted {attachmentCount, plural, one {an attachment} other {{attachmentCount} attachments}}",
+        "defaultMessage": "{user} posted {attachmentCount, plural, one {an attachment} other {# attachments}}",
         "id": "status.title.with_attachments"
       },
       {
diff --git a/yarn.lock b/yarn.lock
index fd07112c31..79a3a65f1f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1270,10 +1270,10 @@
     "@formatjs/intl-localematcher" "0.2.32"
     tslib "^2.4.0"
 
-"@formatjs/icu-messageformat-parser@2.3.0":
-  version "2.3.0"
-  resolved "https://registry.yarnpkg.com/@formatjs/icu-messageformat-parser/-/icu-messageformat-parser-2.3.0.tgz#8e8fd577c3e39454ef14bba4963f2e1d5f2cc46c"
-  integrity sha512-xqtlqYAbfJDF4b6e4O828LBNOWXrFcuYadqAbYORlDRwhyJ2bH+xpUBPldZbzRGUN2mxlZ4Ykhm7jvERtmI8NQ==
+"@formatjs/icu-messageformat-parser@2.3.1":
+  version "2.3.1"
+  resolved "https://registry.yarnpkg.com/@formatjs/icu-messageformat-parser/-/icu-messageformat-parser-2.3.1.tgz#953080ea5c053bc73bdf55d0a524a3c3c133ae6b"
+  integrity sha512-knF2AkAKN4Upv4oIiKY4Wd/dLH68TNMPgV/tJMu/T6FP9aQwbv8fpj7U3lkyniPaNVxvia56Gxax8MKOjtxLSQ==
   dependencies:
     "@formatjs/ecma402-abstract" "1.14.3"
     "@formatjs/icu-skeleton-parser" "1.3.18"
@@ -1306,18 +1306,18 @@
   resolved "https://registry.yarnpkg.com/@formatjs/intl-utils/-/intl-utils-2.2.5.tgz#eaafd94df3d102ee13e54e80f992a33868a6b1e8"
   integrity sha512-p7gcmazKROteL4IECCp03Qrs790fZ8tbemUAjQu0+K0AaAlK49rI1SIFFq3LzDUAqXIshV95JJhRe/yXxkal5g==
 
-"@formatjs/ts-transformer@3.12.0":
-  version "3.12.0"
-  resolved "https://registry.yarnpkg.com/@formatjs/ts-transformer/-/ts-transformer-3.12.0.tgz#7d6340c164db38202ece328ca37d1e9a0d5e62ed"
-  integrity sha512-/jEpXcqA6y/vdijgkxSoKGfkGR5VcClJeI8hnpJ2PBCHfrc4ywFMyoZqRAakKW3IJVttaDo7mGvBAIDxV1F4Qg==
+"@formatjs/ts-transformer@3.13.0":
+  version "3.13.0"
+  resolved "https://registry.yarnpkg.com/@formatjs/ts-transformer/-/ts-transformer-3.13.0.tgz#61185278fb153d61e56fabbeed6d4fc8a0ee3af5"
+  integrity sha512-TshsXkt2loK2GWFJFYTrlNThfCd4ubcEpokl9FWzGoR5f5e2FOxDPs69nTqw+7jodlKtx4VaTSfpNMtPvD9ZfQ==
   dependencies:
-    "@formatjs/icu-messageformat-parser" "2.3.0"
+    "@formatjs/icu-messageformat-parser" "2.3.1"
     "@types/json-stable-stringify" "^1.0.32"
     "@types/node" "14 || 16 || 17"
     chalk "^4.0.0"
     json-stable-stringify "^1.0.1"
     tslib "^2.4.0"
-    typescript "^4.7"
+    typescript "^4.7 || 5"
 
 "@gamestdio/websocket@^0.3.2":
   version "0.3.2"
@@ -1648,16 +1648,11 @@
     "@nodelib/fs.stat" "2.0.5"
     run-parallel "^1.1.9"
 
-"@nodelib/fs.stat@2.0.5":
+"@nodelib/fs.stat@2.0.5", "@nodelib/fs.stat@^2.0.2":
   version "2.0.5"
   resolved "https://registry.yarnpkg.com/@nodelib/fs.stat/-/fs.stat-2.0.5.tgz#5bd262af94e9d25bd1e71b05deed44876a222e8b"
   integrity sha512-RkhPPp2zrqDAQA/2jNhnztcPAlv64XdhIp7a7454A5ovI7Bukxgt7MX7udwAu3zg1DcpPU0rz3VV1SeaqvY4+A==
 
-"@nodelib/fs.stat@^2.0.2":
-  version "2.0.4"
-  resolved "https://registry.yarnpkg.com/@nodelib/fs.stat/-/fs.stat-2.0.4.tgz#a3f2dd61bab43b8db8fa108a121cfffe4c676655"
-  integrity sha512-IYlHJA0clt2+Vg7bccq+TzRdJvv19c2INqBSsoOLp1je7xjtr7J26+WXR72MCdvU9q1qTzIWDfhMf+DRvQJK4Q==
-
 "@nodelib/fs.walk@^1.2.3", "@nodelib/fs.walk@^1.2.8":
   version "1.2.8"
   resolved "https://registry.yarnpkg.com/@nodelib/fs.walk/-/fs.walk-1.2.8.tgz#e95737e8bb6746ddedf69c556953494f196fe69a"
@@ -1933,9 +1928,9 @@
     "@types/json-schema" "*"
 
 "@types/estree@*":
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/@types/estree/-/estree-1.0.0.tgz#5fb2e536c1ae9bf35366eed879e827fa59ca41c2"
-  integrity sha512-WulqXMDUTYAXCjZnk6JtIHPigp55cVtDgDrO2gHRwhyJto21+1zbVCtOYB2L1F9w4qCQ0rOGWBnBe0FNTiEJIQ==
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/@types/estree/-/estree-1.0.1.tgz#aa22750962f3bf0e79d753d3cc067f010c95f194"
+  integrity sha512-LG4opVs2ANWZ1TJoKc937iMmNstM/d0ae1vNbnBvBhqCSezgVUOzcLCqbI5elV8Vy6WKwKjaqR+zO9VKirBBCA==
 
 "@types/estree@0.0.39":
   version "0.0.39"
@@ -2909,7 +2904,7 @@ ansi-styles@^3.2.0, ansi-styles@^3.2.1:
   dependencies:
     color-convert "^1.9.0"
 
-ansi-styles@^4.0.0, ansi-styles@^4.1.0:
+ansi-styles@^4.0.0:
   version "4.2.1"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-4.2.1.tgz#90ae75c424d008d2624c5bf29ead3177ebfcf359"
   integrity sha512-9VGjrMsG1vePxcSweQsN20KY/c4zN0h9fLjqAbwbPfahM3t+NL+M9HC8xeXG2I8pX5NoamTGNuomEUFI7fcUjA==
@@ -2917,6 +2912,13 @@ ansi-styles@^4.0.0, ansi-styles@^4.1.0:
     "@types/color-name" "^1.1.1"
     color-convert "^2.0.1"
 
+ansi-styles@^4.1.0:
+  version "4.3.0"
+  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-4.3.0.tgz#edd803628ae71c04c85ae7a0906edad34b648937"
+  integrity sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==
+  dependencies:
+    color-convert "^2.0.1"
+
 ansi-styles@^5.0.0:
   version "5.2.0"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-5.2.0.tgz#07449690ad45777d1924ac2abb2fc8895dba836b"
@@ -5036,12 +5038,12 @@ eslint-module-utils@^2.7.4:
     debug "^3.2.7"
 
 eslint-plugin-formatjs@^4.9.0:
-  version "4.9.1"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-formatjs/-/eslint-plugin-formatjs-4.9.1.tgz#4269bdf61c627587b3fb112fef55250178d818ce"
-  integrity sha512-e6A7v84y6/RgXRYWqIQHJSHKutXGsQVdkYkzL7pgw5cJGEao0YVFqrbYu8ckbQsxQWfq8Dai4w0A/531F0mm2A==
+  version "4.10.0"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-formatjs/-/eslint-plugin-formatjs-4.10.0.tgz#05da23f75b4ce507c90df93ff07be2b6e70ffbc5"
+  integrity sha512-YvNF72NVMkIevgJrX5xTkIj4eBCeiweM2/61ppP2eEni3FP4pDXy9UFsOhtxJVISTBH0UEAqz3xhRjqi1q+qag==
   dependencies:
-    "@formatjs/icu-messageformat-parser" "2.3.0"
-    "@formatjs/ts-transformer" "3.12.0"
+    "@formatjs/icu-messageformat-parser" "2.3.1"
+    "@formatjs/ts-transformer" "3.13.0"
     "@types/eslint" "7 || 8"
     "@types/picomatch" "^2.3.0"
     "@typescript-eslint/typescript-estree" "5.45.0"
@@ -5049,7 +5051,7 @@ eslint-plugin-formatjs@^4.9.0:
     magic-string "^0.29.0"
     picomatch "^2.3.1"
     tslib "2.4.0"
-    typescript "^4.7"
+    typescript "^4.7 || 5"
     unicode-emoji-utils "^1.1.1"
 
 eslint-plugin-import@~2.27.5:
@@ -5463,9 +5465,9 @@ fastest-levenshtein@^1.0.16:
   integrity sha512-eRnCtTTtGZFpQCwhJiUOuxPQWRXVKYDn0b2PeHfXL6/Zi53SLAzAHfVhVWK2AryC/WH05kGfxhFIPvTF0SXQzg==
 
 fastq@^1.6.0:
-  version "1.11.0"
-  resolved "https://registry.yarnpkg.com/fastq/-/fastq-1.11.0.tgz#bb9fb955a07130a918eb63c1f5161cc32a5d0858"
-  integrity sha512-7Eczs8gIPDrVzT+EksYBcupqMyxSHXXrHOLRRxU2/DicV8789MRBRR8+Hc2uWzUupOs4YS4JzBmBxjjCVBxD/g==
+  version "1.15.0"
+  resolved "https://registry.yarnpkg.com/fastq/-/fastq-1.15.0.tgz#d04d07c6a2a68fe4599fea8d2e103a937fae6b3a"
+  integrity sha512-wBrocU2LCXXa+lWBt8RoIRD89Fi8OdABODa/kEnyeyjS5aZO5/GNvI5sEINADqP/h8M29UHTHUb53sUu5Ihqdw==
   dependencies:
     reusify "^1.0.4"
 
@@ -6602,7 +6604,7 @@ is-extendable@^1.0.1:
 is-extglob@^2.1.0, is-extglob@^2.1.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/is-extglob/-/is-extglob-2.1.1.tgz#a88c02535791f02ed37c76a1b9ea9773c833f8c2"
-  integrity sha1-qIwCU1eR8C7TfHahueqXc8gz+MI=
+  integrity sha512-SbKbANkN603Vi4jEZv49LeVJMn4yGwsbzZworEoyEiutsN3nJYdbO36zfhGJ6QEDpOZIFkDtnq5JRxmvl3jsoQ==
 
 is-fullwidth-code-point@^2.0.0:
   version "2.0.0"
@@ -7434,11 +7436,11 @@ json-stable-stringify-without-jsonify@^1.0.1:
   integrity sha1-nbe1lJatPzz+8wp1FC0tkwrXJlE=
 
 json-stable-stringify@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/json-stable-stringify/-/json-stable-stringify-1.0.1.tgz#9a759d39c5f2ff503fd5300646ed445f88c4f9af"
-  integrity sha1-mnWdOcXy/1A/1TAGRu1EX4jE+a8=
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/json-stable-stringify/-/json-stable-stringify-1.0.2.tgz#e06f23128e0bbe342dc996ed5a19e28b57b580e0"
+  integrity sha512-eunSSaEnxV12z+Z73y/j5N37/In40GK4GmsSy+tEHJMxknvqnA7/djeYtAgW0GsWHUfg+847WJjKaEylk2y09g==
   dependencies:
-    jsonify "~0.0.0"
+    jsonify "^0.0.1"
 
 json3@^3.3.3:
   version "3.3.3"
@@ -7473,10 +7475,10 @@ jsonfile@^6.0.1:
   optionalDependencies:
     graceful-fs "^4.1.6"
 
-jsonify@~0.0.0:
-  version "0.0.0"
-  resolved "https://registry.yarnpkg.com/jsonify/-/jsonify-0.0.0.tgz#2c74b6ee41d93ca51b7b5aaee8f503631d252a73"
-  integrity sha1-LHS27kHZPKUbe1qu6PUDYx0lKnM=
+jsonify@^0.0.1:
+  version "0.0.1"
+  resolved "https://registry.yarnpkg.com/jsonify/-/jsonify-0.0.1.tgz#2aa3111dae3d34a0f151c63f3a45d995d9420978"
+  integrity sha512-2/Ki0GcmuqSrgFyelQq9M05y7PS0mEwuIzrf3f1fPqkVDVRvZrPZtVSMHxdgo8Aq0sxAOb/cr2aqqA3LeWHVPg==
 
 jsonpointer@^5.0.0:
   version "5.0.0"
@@ -10213,13 +10215,20 @@ semver@^6.0.0, semver@^6.1.1, semver@^6.1.2, semver@^6.3.0:
   resolved "https://registry.yarnpkg.com/semver/-/semver-6.3.0.tgz#ee0a64c8af5e8ceea67687b133761e1becbd1d3d"
   integrity sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==
 
-semver@^7.3.2, semver@^7.3.4, semver@^7.3.5, semver@^7.3.7:
+semver@^7.3.2, semver@^7.3.4, semver@^7.3.5:
   version "7.3.8"
   resolved "https://registry.yarnpkg.com/semver/-/semver-7.3.8.tgz#07a78feafb3f7b32347d725e33de7e2a2df67798"
   integrity sha512-NB1ctGL5rlHrPJtFDVIVzTyQylMLu9N9VICA6HSFJo8MCGVTMW6gfpicwKmmK/dAjTOrqu5l63JJOpDSrAis3A==
   dependencies:
     lru-cache "^6.0.0"
 
+semver@^7.3.7:
+  version "7.5.0"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-7.5.0.tgz#ed8c5dc8efb6c629c88b23d41dc9bf40c1d96cd0"
+  integrity sha512-+XC0AD/R7Q2mPSRuy2Id0+CGTZ98+8f+KvwirxOKIEyid+XSx6HbC63p+O4IndTHuX5Z+JxQ0TghCkO5Cg/2HA==
+  dependencies:
+    lru-cache "^6.0.0"
+
 send@0.18.0:
   version "0.18.0"
   resolved "https://registry.yarnpkg.com/send/-/send-0.18.0.tgz#670167cc654b05f5aa4a767f9113bb371bc706be"
@@ -11398,12 +11407,7 @@ type@^2.0.0:
   resolved "https://registry.yarnpkg.com/type/-/type-2.0.0.tgz#5f16ff6ef2eb44f260494dae271033b29c09a9c3"
   integrity sha512-KBt58xCHry4Cejnc2ISQAF7QY+ORngsWfxezO68+12hKV6lQY8P/psIkcbjeHWn7MqcgciWJyCCevFMJdIXpow==
 
-typescript@^4.7:
-  version "4.9.5"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.9.5.tgz#095979f9bcc0d09da324d58d03ce8f8374cbe65a"
-  integrity sha512-1FXk9E2Hm+QzZQ7z+McJiHL4NW1F2EzMu9Nq9i3zAaGqibafqYwCVU6WyWAuyQRRzOlxou8xZSyXLEN8oKj24g==
-
-typescript@^5.0.4:
+"typescript@^4.7 || 5", typescript@^5.0.4:
   version "5.0.4"
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-5.0.4.tgz#b217fd20119bd61a94d4011274e0ab369058da3b"
   integrity sha512-cW9T5W9xY37cc+jfEnaUvX91foxtHkza3Nw3wkoF4sSlKn0MONdkdEndig/qPBWXNkmplh3NzayQzCiHM4/hqw==