diff --git a/packages/fuzzer/package.json b/packages/fuzzer/package.json
index 73fba2af88..b93cd628ae 100644
--- a/packages/fuzzer/package.json
+++ b/packages/fuzzer/package.json
@@ -11,7 +11,7 @@
     "dotenv": "^8.2.0",
     "ethers": "^5.4.3",
     "ts-node": "^9.0.0",
-    "typescript": "~4.1.0",
+    "typescript": "~4.9.0",
     "yargs": "^16.0.3"
   }
 }
diff --git a/packages/lib-base/package.json b/packages/lib-base/package.json
index 90ab5431b4..51a00aae70 100644
--- a/packages/lib-base/package.json
+++ b/packages/lib-base/package.json
@@ -35,6 +35,6 @@
     "mocha": "8.3.2",
     "npm-run-all2": "5.0.2",
     "ts-node": "9.1.1",
-    "typescript": "4.1.5"
+    "typescript": "4.9.5"
   }
 }
diff --git a/packages/lib-react/package.json b/packages/lib-react/package.json
index 20ea0f68f1..44983d03d1 100644
--- a/packages/lib-react/package.json
+++ b/packages/lib-react/package.json
@@ -34,6 +34,6 @@
     "eslint-plugin-react-hooks": "4.6.2",
     "npm-run-all2": "5.0.2",
     "react": "17.0.2",
-    "typescript": "4.1.5"
+    "typescript": "4.9.5"
   }
 }
diff --git a/packages/lib-subgraph/package.json b/packages/lib-subgraph/package.json
index f163ac4af5..5254bfe55f 100644
--- a/packages/lib-subgraph/package.json
+++ b/packages/lib-subgraph/package.json
@@ -18,7 +18,7 @@
     "apollo": "^2.30.3",
     "npm-run-all2": "^5.0.0",
     "rimraf": "^3.0.2",
-    "typescript": "~4.1.0"
+    "typescript": "~4.9.0"
   },
   "dependencies": {
     "@apollo/client": "^3.11.8",
diff --git a/packages/providers/package.json b/packages/providers/package.json
index 91afd92545..55894878f7 100644
--- a/packages/providers/package.json
+++ b/packages/providers/package.json
@@ -20,7 +20,7 @@
   "devDependencies": {
     "ethers": "^5.4.3",
     "ts-node": "^9.1.1",
-    "typescript": "~4.1.0"
+    "typescript": "~4.9.0"
   },
   "peerDependencies": {
     "ethers": "^5.3.0"
diff --git a/yarn.lock b/yarn.lock
index 84cc716351..b18757dd14 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2351,7 +2351,7 @@ __metadata:
     dotenv: ^8.2.0
     ethers: ^5.4.3
     ts-node: ^9.0.0
-    typescript: ~4.1.0
+    typescript: ~4.9.0
     yargs: ^16.0.3
   languageName: unknown
   linkType: soft
@@ -2371,7 +2371,7 @@ __metadata:
     mocha: 8.3.2
     npm-run-all2: 5.0.2
     ts-node: 9.1.1
-    typescript: 4.1.5
+    typescript: 4.9.5
   languageName: unknown
   linkType: soft
 
@@ -2446,7 +2446,7 @@ __metadata:
     eslint-plugin-react-hooks: 4.6.2
     npm-run-all2: 5.0.2
     react: 17.0.2
-    typescript: 4.1.5
+    typescript: 4.9.5
   peerDependencies:
     "@liquity/lib-base": ^3.0.0
     react: ^16.13.1
@@ -2464,7 +2464,7 @@ __metadata:
     graphql: ^15.3.0
     npm-run-all2: ^5.0.0
     rimraf: ^3.0.2
-    typescript: ~4.1.0
+    typescript: ~4.9.0
   peerDependencies:
     "@liquity/lib-base": ^3.0.0
   languageName: unknown
@@ -2490,7 +2490,7 @@ __metadata:
   dependencies:
     ethers: ^5.4.3
     ts-node: ^9.1.1
-    typescript: ~4.1.0
+    typescript: ~4.9.0
   peerDependencies:
     ethers: ^5.3.0
   languageName: unknown
@@ -25246,13 +25246,13 @@ __metadata:
   languageName: node
   linkType: hard
 
-"typescript@npm:4.1.5, typescript@npm:~4.1.0":
-  version: 4.1.5
-  resolution: "typescript@npm:4.1.5"
+"typescript@npm:4.9.5, typescript@npm:~4.9.0":
+  version: 4.9.5
+  resolution: "typescript@npm:4.9.5"
   bin:
     tsc: bin/tsc
     tsserver: bin/tsserver
-  checksum: af660e69aa5184520dfa57362dcf7fd1b26d08b869d76b3bd58dcc04058a757983f470cd61ded824ab01fa08a81d58c7f607d8e360f4e550664b9439d04f8e41
+  checksum: ee000bc26848147ad423b581bd250075662a354d84f0e06eb76d3b892328d8d4440b7487b5a83e851b12b255f55d71835b008a66cbf8f255a11e4400159237db
   languageName: node
   linkType: hard
 
@@ -25276,13 +25276,13 @@ __metadata:
   languageName: node
   linkType: hard
 
-"typescript@patch:typescript@4.1.5#~builtin<compat/typescript>, typescript@patch:typescript@~4.1.0#~builtin<compat/typescript>":
-  version: 4.1.5
-  resolution: "typescript@patch:typescript@npm%3A4.1.5#~builtin<compat/typescript>::version=4.1.5&hash=4a8eb8"
+"typescript@patch:typescript@4.9.5#~builtin<compat/typescript>, typescript@patch:typescript@~4.9.0#~builtin<compat/typescript>":
+  version: 4.9.5
+  resolution: "typescript@patch:typescript@npm%3A4.9.5#~builtin<compat/typescript>::version=4.9.5&hash=289587"
   bin:
     tsc: bin/tsc
     tsserver: bin/tsserver
-  checksum: fde897357ff6bb729323dc6d58753193d0d8e3d90ea66081f9a4eb798e1056a3a47a49c666a7bccdf93e37780ed0913b78de83a766c6da85b73bad3ed34470d0
+  checksum: 1f8f3b6aaea19f0f67cba79057674ba580438a7db55057eb89cc06950483c5d632115c14077f6663ea76fd09fce3c190e6414bb98582ec80aa5a4eaf345d5b68
   languageName: node
   linkType: hard