diff --git a/package.json b/package.json
index de68e80f0..501f02637 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
         "lint": "prettier --check . && eslint \"packages/**/*.{ts,js}\""
     },
     "dependencies": {
-        "typescript": "^4.4.3"
+        "typescript": "^4.5.3"
     },
     "devDependencies": {
         "@sveltejs/eslint-config": "github:sveltejs/eslint-config#v5.2.0",
diff --git a/packages/language-server/package.json b/packages/language-server/package.json
index fa81b1ef2..ab583200d 100644
--- a/packages/language-server/package.json
+++ b/packages/language-server/package.json
@@ -52,11 +52,11 @@
         "estree-walker": "^2.0.1",
         "fast-glob": "^3.2.7",
         "lodash": "^4.17.21",
-        "prettier": "2.4.1",
+        "prettier": "2.5.0",
         "prettier-plugin-svelte": "~2.5.0",
         "source-map": "^0.7.3",
         "svelte": "~3.38.2",
-        "svelte-preprocess": "~4.7.3",
+        "svelte-preprocess": "~4.9.8",
         "svelte2tsx": "~0.4.0",
         "typescript": "*",
         "vscode-css-languageservice": "~5.1.0",
diff --git a/packages/language-server/test/plugins/typescript/features/diagnostics/fixtures/ignore-generated-code/expected.json b/packages/language-server/test/plugins/typescript/features/diagnostics/fixtures/ignore-generated-code/expected.json
index 4c3f353b4..6e951a05e 100644
--- a/packages/language-server/test/plugins/typescript/features/diagnostics/fixtures/ignore-generated-code/expected.json
+++ b/packages/language-server/test/plugins/typescript/features/diagnostics/fixtures/ignore-generated-code/expected.json
@@ -38,8 +38,8 @@
         "range": { "start": { "line": 15, "character": 2 }, "end": { "line": 15, "character": 9 } },
         "severity": 1,
         "source": "ts",
-        "message": "Type '\"food\"' is not assignable to type '\"foo\" | \"bar\"'.",
-        "code": 2322,
+        "message": "Type '\"food\"' is not assignable to type '\"foo\" | \"bar\"'. Did you mean '\"foo\"'?",
+        "code": 2820,
         "tags": []
     }
 ]
diff --git a/packages/svelte2tsx/package.json b/packages/svelte2tsx/package.json
index 11487d310..360732364 100644
--- a/packages/svelte2tsx/package.json
+++ b/packages/svelte2tsx/package.json
@@ -37,7 +37,7 @@
         "svelte": "~3.38.2",
         "tiny-glob": "^0.2.6",
         "tslib": "^1.10.0",
-        "typescript": "^4.4.3"
+        "typescript": "^4.5.3"
     },
     "peerDependencies": {
         "svelte": "^3.24",
diff --git a/yarn.lock b/yarn.lock
index 9b648e31a..7a8d4d4e8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -579,6 +579,11 @@ browser-stdout@1.3.1:
   resolved "https://registry.yarnpkg.com/browser-stdout/-/browser-stdout-1.3.1.tgz#baa559ee14ced73452229bad7326467c61fabd60"
   integrity sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==
 
+buffer-crc32@^0.2.5:
+  version "0.2.13"
+  resolved "https://registry.yarnpkg.com/buffer-crc32/-/buffer-crc32-0.2.13.tgz#0d333e3f00eac50aa1454abd30ef8c2a5d9a7242"
+  integrity sha1-DTM+PwDqxQqhRUq9MO+MKl2ackI=
+
 buffer-from@^1.0.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.1.1.tgz#32713bc028f75c02fdb710d7c7bcec1f2c6070ef"
@@ -934,6 +939,11 @@ es-to-primitive@^1.2.1:
     is-date-object "^1.0.1"
     is-symbol "^1.0.2"
 
+es6-promise@^3.1.2:
+  version "3.3.1"
+  resolved "https://registry.yarnpkg.com/es6-promise/-/es6-promise-3.3.1.tgz#a08cdde84ccdbf34d027a1451bc91d4bcd28a613"
+  integrity sha1-oIzd6EzNvzTQJ6FFG8kdS80ophM=
+
 escalade@^3.1.1:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/escalade/-/escalade-3.1.1.tgz#d8cfdc7000965c5a0174b4a82eaa5c0552742e40"
@@ -1359,6 +1369,11 @@ graceful-fs@^4.1.2, graceful-fs@^4.1.6, graceful-fs@^4.2.0, graceful-fs@^4.2.2:
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.4.tgz#2256bde14d3632958c465ebc96dc467ca07a29fb"
   integrity sha512-WjKPNJF79dtJAVniUlGGWHYGz2jWxT6VhN/4m1NdkbZ2nOsEF+cI1Edgql5zCRhs/VsQYRvrXctxktVXZUkixw==
 
+graceful-fs@^4.1.3:
+  version "4.2.8"
+  resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.8.tgz#e412b8d33f5e006593cbd3cee6df9f2cebbe802a"
+  integrity sha512-qkIilPUYcNhJpd33n0GBXTB1MMPp14TxEsEs0pTrsSVucApsYzW5V+Q8Qxhik6KU3evy+qkAAowTByymK0avdg==
+
 growl@1.10.5:
   version "1.10.5"
   resolved "https://registry.yarnpkg.com/growl/-/growl-1.10.5.tgz#f2735dc2283674fa67478b10181059355c369e5e"
@@ -2087,10 +2102,10 @@ prettier@2.3.2:
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.3.2.tgz#ef280a05ec253712e486233db5c6f23441e7342d"
   integrity sha512-lnJzDfJ66zkMy58OL5/NY5zp70S7Nz6KqcKkXYzn2tMVrNxvbqaBpg7H3qHaLxCJ5lNMsGuM8+ohS7cZrthdLQ==
 
-prettier@2.4.1:
-  version "2.4.1"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.4.1.tgz#671e11c89c14a4cfc876ce564106c4a6726c9f5c"
-  integrity sha512-9fbDAXSBcc6Bs1mZrDYb3XKzDLm4EXXL9sC1LqKP5rZkT6KRr/rf9amVUcODVXgguK/isJz0d0hP72WeaKWsvA==
+prettier@2.5.0:
+  version "2.5.0"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.5.0.tgz#a6370e2d4594e093270419d9cc47f7670488f893"
+  integrity sha512-FM/zAKgWTxj40rH03VxzIPdXmj39SwSjwG0heUcNFwI+EMZJnY93yAiKXM3dObIKAM5TA88werc8T/EwhB45eg==
 
 progress@^2.0.0:
   version "2.0.3"
@@ -2174,6 +2189,13 @@ rimraf@2.6.3:
   dependencies:
     glob "^7.1.3"
 
+rimraf@^2.5.2:
+  version "2.7.1"
+  resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.7.1.tgz#35797f13a7fdadc566142c29d4f07ccad483e3ec"
+  integrity sha512-uWjbaKIK3T1OSVptzX7Nl6PvQ3qAGtKEtVRjRuazjfL3Bx5eI409VZSqgND+4UNnmzLVdPj9FqFJNPqBZFve4w==
+  dependencies:
+    glob "^7.1.3"
+
 rimraf@^3.0.0:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-3.0.2.tgz#f1a5402ba6220ad52cc1282bac1ae3aa49fd061a"
@@ -2238,6 +2260,16 @@ safe-buffer@^5.1.0:
   resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.2.1.tgz#1eaf9fa9bdb1fdd4ec75f58f9cdb4e6b7827eec6"
   integrity sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ==
 
+sander@^0.5.0:
+  version "0.5.1"
+  resolved "https://registry.yarnpkg.com/sander/-/sander-0.5.1.tgz#741e245e231f07cafb6fdf0f133adfa216a502ad"
+  integrity sha1-dB4kXiMfB8r7b98PEzrfohalAq0=
+  dependencies:
+    es6-promise "^3.1.2"
+    graceful-fs "^4.1.3"
+    mkdirp "^0.5.1"
+    rimraf "^2.5.2"
+
 "semver@2 || 3 || 4 || 5":
   version "5.7.1"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.7.1.tgz#a954f931aeba508d307bbf069eff0c01c96116f7"
@@ -2305,6 +2337,16 @@ slice-ansi@^2.1.0:
     astral-regex "^1.0.0"
     is-fullwidth-code-point "^2.0.0"
 
+sorcery@^0.10.0:
+  version "0.10.0"
+  resolved "https://registry.yarnpkg.com/sorcery/-/sorcery-0.10.0.tgz#8ae90ad7d7cb05fc59f1ab0c637845d5c15a52b7"
+  integrity sha1-iukK19fLBfxZ8asMY3hF1cFaUrc=
+  dependencies:
+    buffer-crc32 "^0.2.5"
+    minimist "^1.2.0"
+    sander "^0.5.0"
+    sourcemap-codec "^1.3.0"
+
 source-map-support@^0.5.16, source-map-support@^0.5.17:
   version "0.5.19"
   resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.19.tgz#a98b62f86dcaf4f67399648c085291ab9e8fed61"
@@ -2323,7 +2365,7 @@ source-map@^0.6.0, source-map@^0.6.1:
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
   integrity sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==
 
-sourcemap-codec@^1.4.4, sourcemap-codec@^1.4.8:
+sourcemap-codec@^1.3.0, sourcemap-codec@^1.4.4, sourcemap-codec@^1.4.8:
   version "1.4.8"
   resolved "https://registry.yarnpkg.com/sourcemap-codec/-/sourcemap-codec-1.4.8.tgz#ea804bd94857402e6992d05a38ef1ae35a9ab4c4"
   integrity sha512-9NykojV5Uih4lgo5So5dtw+f0JgJX30KCNI8gwhz2J9A15wD0Ml6tjHKwf6fTSa6fAdVBdZeNOs9eJ71qCk8vA==
@@ -2493,14 +2535,16 @@ svelte-preprocess@^4.0.0:
     detect-indent "^6.0.0"
     strip-indent "^3.0.0"
 
-svelte-preprocess@~4.7.3:
-  version "4.7.3"
-  resolved "https://registry.yarnpkg.com/svelte-preprocess/-/svelte-preprocess-4.7.3.tgz#454fa059c2400b15e7a3caeca18993cff9df0e96"
-  integrity sha512-Zx1/xLeGOIBlZMGPRCaXtlMe4ZA0faato5Dc3CosEqwu75MIEPuOstdkH6cy+RYTUYynoxzNaDxkPX4DbrPwRA==
+svelte-preprocess@~4.9.8:
+  version "4.9.8"
+  resolved "https://registry.yarnpkg.com/svelte-preprocess/-/svelte-preprocess-4.9.8.tgz#fd40afebfb352f469beab289667485ebf0d811da"
+  integrity sha512-EQS/oRZzMtYdAprppZxY3HcysKh11w54MgA63ybtL+TAZ4hVqYOnhw41JVJjWN9dhPnNjjLzvbZ2tMhTsla1Og==
   dependencies:
     "@types/pug" "^2.0.4"
     "@types/sass" "^1.16.0"
     detect-indent "^6.0.0"
+    magic-string "^0.25.7"
+    sorcery "^0.10.0"
     strip-indent "^3.0.0"
 
 svelte@~3.38.2:
@@ -2598,10 +2642,10 @@ type-fest@^0.8.1:
   resolved "https://registry.yarnpkg.com/type-fest/-/type-fest-0.8.1.tgz#09e249ebde851d3b1e48d27c105444667f17b83d"
   integrity sha512-4dbzIzqvjtgiM5rw1k5rEHtBANKmdudhGyBEajN01fEyhaAIhsoKNy6y7+IN93IfpFtwY9iqi7kD+xwKhQsNJA==
 
-typescript@*, typescript@^4.4.3:
-  version "4.4.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.4.3.tgz#bdc5407caa2b109efd4f82fe130656f977a29324"
-  integrity sha512-4xfscpisVgqqDfPaJo5vkd+Qd/ItkoagnHpufr+i2QCHBsNYp+G7UAoyFl8aPtx879u38wPV65rZ8qbGZijalA==
+typescript@*, typescript@^4.5.3:
+  version "4.5.3"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.5.3.tgz#afaa858e68c7103317d89eb90c5d8906268d353c"
+  integrity sha512-eVYaEHALSt+s9LbvgEv4Ef+Tdq7hBiIZgii12xXJnukryt3pMgJf6aKhoCZ3FWQsu6sydEnkg11fYXLzhLBjeQ==
 
 unist-util-stringify-position@^2.0.0:
   version "2.0.3"