diff --git a/package-lock.json b/package-lock.json
index 4759b28c5..9d02fc9a0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -122,7 +122,7 @@
         "typescript": "4.9.5"
       },
       "peerDependencies": {
-        "@stencila/schema": "^1.9.0"
+        "@stencila/schema": "1.9.0"
       }
     },
     "node_modules/@adobe/css-tools": {
@@ -4735,9 +4735,9 @@
       "integrity": "sha512-Kp5OOf7LkN1C/H8naBlQlH6cQyexrLy5FSwEQunWdF8ZkB4jz5Lpv9VyLZkX4GsRWvbJTxgo6twM7q3alprHrA=="
     },
     "node_modules/@stencila/schema": {
-      "version": "1.18.0",
-      "resolved": "https://registry.npmjs.org/@stencila/schema/-/schema-1.18.0.tgz",
-      "integrity": "sha512-mWvEi6Y+8hQRqlRfJHUPQ/GZUN+rfY7kB7JSx1Cts64PsF+odgJ2AFu+fltnK94jRB8Ohk0B4SPJLnuGLeZGBg=="
+      "version": "1.9.0",
+      "resolved": "https://registry.npmjs.org/@stencila/schema/-/schema-1.9.0.tgz",
+      "integrity": "sha512-4YhRt3dyNSE9cRpDYgDvIR+Rwvo3vC3+2gHRNZhEaAy9q7RX7XNSbi/ZhFiUnv1oDsdE8U32iiTC1V4G49CXdg=="
     },
     "node_modules/@stencila/semantic-release-config": {
       "version": "2.0.20",
@@ -15897,6 +15897,7 @@
       "resolved": "https://registry.npmjs.org/ini/-/ini-4.1.1.tgz",
       "integrity": "sha512-QQnnxNyfvmHFIsj7gkPcYymR8Jdw/o7mp5ZFihxn6h8Ci6fh3Dx4E1gPjpQEpIuPo9XVNY/ZUwh4BPMjGyL01g==",
       "dev": true,
+      "peer": true,
       "engines": {
         "node": "^14.17.0 || ^16.13.0 || >=18.0.0"
       }
diff --git a/package.json b/package.json
index d643fe817..0c1cca747 100644
--- a/package.json
+++ b/package.json
@@ -106,7 +106,7 @@
     "xml-js": "^1.6.11"
   },
   "peerDependencies": {
-    "@stencila/schema": "^1.9.0"
+    "@stencila/schema": "1.9.0"
   },
   "devDependencies": {
     "@qiwi/semantic-release-gh-pages-plugin": "5.2.8",