diff --git a/packages/core/package.json b/packages/core/package.json
index 9d71551..8767263 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -24,7 +24,7 @@
   "types": "lib/index.d.ts",
   "author": "Tony Garnock-Jones <tonyg@leastfixedpoint.com>",
   "dependencies": {
-    "@preserves/core": "0.17.0",
-    "@preserves/schema": "0.18.0"
+    "@preserves/core": "0.18.0",
+    "@preserves/schema": "0.19.0"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index 37dc4c1..555812d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1372,24 +1372,24 @@
   dependencies:
     "@octokit/openapi-types" "^11.2.0"
 
-"@preserves/core@0.17.0", "@preserves/core@^0.17.0":
-  version "0.17.0"
-  resolved "https://registry.yarnpkg.com/@preserves/core/-/core-0.17.0.tgz#23e7edb0a1bf5e602d210ea2ae474113d0cc5b12"
-  integrity sha512-ZyqsC8f08yvOn9UjaBekIhKDY44k7sWwyW2xTLfVCffFHGCPidgq6uUGKcuKAbr3ibGB7kQ6KQr/xgVAUpDC0Q==
-
-"@preserves/schema@0.18.0":
+"@preserves/core@0.18.0", "@preserves/core@^0.18.0":
   version "0.18.0"
-  resolved "https://registry.yarnpkg.com/@preserves/schema/-/schema-0.18.0.tgz#593a33a41eccc62a72a620b75379676b7b72b17c"
-  integrity sha512-L2IygPGYHZSxfDkHdcohuNCjYbj7BI+5+RJFrPL3vLmT2kj0IYJi6lZu1ReumALbBTx7RW8Mn9IorH8qVUZ39A==
+  resolved "https://registry.yarnpkg.com/@preserves/core/-/core-0.18.0.tgz#d85362f96ab925a336fa810d217fd9bd7c0f1ed1"
+  integrity sha512-u/lzogGZqjnuJZIIzh1qHDkxW4UYAqpciyU9uZAHPgxwSFP1RrAz+103E9GN1plckBstG/gD6J91Mn5bk4ATdg==
+
+"@preserves/schema@0.19.0":
+  version "0.19.0"
+  resolved "https://registry.yarnpkg.com/@preserves/schema/-/schema-0.19.0.tgz#dd631e9128a94c9cd2eeeead17e6c018c6381cff"
+  integrity sha512-gCsG5keqButGQleCcA6O+iDOCkVDtIKio0tsdivtbU7TD5UGqKQTSLPlrSpaiVIVFs5wH+1k1knlfi8cBkiCuQ==
   dependencies:
-    "@preserves/core" "^0.17.0"
-    "@types/glob" "^7.1.3"
-    "@types/minimatch" "^3.0.3"
-    chalk "^4.1.0"
-    chokidar "^3.5.1"
-    commander "^7.2.0"
-    glob "^7.1.6"
-    minimatch "^3.0.4"
+    "@preserves/core" "^0.18.0"
+    "@types/glob" "^7.1"
+    "@types/minimatch" "^3.0"
+    chalk "^4.1"
+    chokidar "^3.5"
+    commander "^7.2"
+    glob "^7.1"
+    minimatch "^3.0"
 
 "@rollup/plugin-node-resolve@^13.0":
   version "13.0.6"
@@ -1489,7 +1489,7 @@
   resolved "https://registry.yarnpkg.com/@types/estree/-/estree-0.0.39.tgz#e177e699ee1b8c22d23174caaa7422644389509f"
   integrity sha512-EYNwp3bU+98cpU4lAWYYL7Zz+2gryWH1qbdDTidVd6hkiR6weksdbMadyXKXNPEkQFhXM+hVO9ZygomHXp+AIw==
 
-"@types/glob@^7.1.3":
+"@types/glob@^7.1":
   version "7.2.0"
   resolved "https://registry.yarnpkg.com/@types/glob/-/glob-7.2.0.tgz#bc1b5bf3aa92f25bd5dd39f35c57361bdce5b2eb"
   integrity sha512-ZUxbzKl0IfJILTS6t7ip5fQQM/J3TJYubDm3nMbgubNNYS62eXeUpoLUC8/7fJNiFYHTrGPQn7hspDUzIHX3UA==
@@ -1531,7 +1531,7 @@
     jest-diff "^27.0.0"
     pretty-format "^27.0.0"
 
-"@types/minimatch@*", "@types/minimatch@^3.0.3":
+"@types/minimatch@*", "@types/minimatch@^3.0", "@types/minimatch@^3.0.3":
   version "3.0.5"
   resolved "https://registry.yarnpkg.com/@types/minimatch/-/minimatch-3.0.5.tgz#1001cc5e6a3704b83c236027e77f2f58ea010f40"
   integrity sha512-Klz949h02Gz2uZCMGwDUSDS1YBlTdDDgbWHi+81l29tQALUtvz4rAYi5uoVhE5Lagoq6DeqAUlbrHvW/mXDgdQ==
@@ -2061,7 +2061,7 @@ chalk@^2.0.0:
     escape-string-regexp "^1.0.5"
     supports-color "^5.3.0"
 
-chalk@^4.0.0, chalk@^4.1.0:
+chalk@^4.0.0, chalk@^4.1, chalk@^4.1.0:
   version "4.1.2"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-4.1.2.tgz#aac4e2b7734a740867aeb16bf02aad556a1e7a01"
   integrity sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==
@@ -2079,7 +2079,7 @@ chardet@^0.7.0:
   resolved "https://registry.yarnpkg.com/chardet/-/chardet-0.7.0.tgz#90094849f0937f2eedc2425d0d28a9e5f0cbad9e"
   integrity sha512-mT8iDcrh03qDGRRmoA2hmBJnxpllMR+0/0qlzjqZES6NdiWDcZkCNAk4rPFZ9Q85r27unkiNNg8ZOiwZXBHwcA==
 
-chokidar@^3.5.1:
+chokidar@^3.5, chokidar@^3.5.1:
   version "3.5.2"
   resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-3.5.2.tgz#dba3976fcadb016f66fd365021d91600d01c1e75"
   integrity sha512-ekGhOnNVPgT77r4K/U3GDhu+FQ2S8TnK/s2KbIGXi0SZWuwkZ2QNyfWdZW+TVfn84DpEP7rLeCt2UI6bJ8GwbQ==
@@ -2225,7 +2225,7 @@ commander@^2.20.0:
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.3.tgz#fd485e84c03eb4881c20722ba48035e8531aeb33"
   integrity sha512-GpVkmM8vF2vQUkj2LvZmD35JxeJOLCwJ9cUkugyk2nuhbv3+mJvpLYYt+0+USMxE+oj+ey/lJEnhZw75x/OMcQ==
 
-commander@^7.2.0:
+commander@^7.2:
   version "7.2.0"
   resolved "https://registry.yarnpkg.com/commander/-/commander-7.2.0.tgz#a36cb57d0b501ce108e4d20559a150a391d97ab7"
   integrity sha512-QrWXB+ZQSVPmIWIhtEO9H+gwHaMGYiF5ChvoJ+K9ZGHG/sVsa6yiesAD1GC/x46sET00Xlwo1u49RVVVzvcSkw==
@@ -3055,7 +3055,7 @@ glob-parent@^5.1.1, glob-parent@^5.1.2, glob-parent@~5.1.2:
   dependencies:
     is-glob "^4.0.1"
 
-glob@^7.1.1, glob@^7.1.2, glob@^7.1.3, glob@^7.1.4, glob@^7.1.6:
+glob@^7.1, glob@^7.1.1, glob@^7.1.2, glob@^7.1.3, glob@^7.1.4, glob@^7.1.6:
   version "7.2.0"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.2.0.tgz#d15535af7732e02e948f4c41628bd910293f6023"
   integrity sha512-lmLf6gtyrPq8tTjSmrO94wBeQbFR3HbLHbuyD69wuyQkImp2hWqMGB47OX65FBkPffO641IP9jWa1z4ivqG26Q==
@@ -4436,7 +4436,7 @@ min-indent@^1.0.0:
   resolved "https://registry.yarnpkg.com/min-indent/-/min-indent-1.0.1.tgz#a63f681673b30571fbe8bc25686ae746eefa9869"
   integrity sha512-I9jwMn07Sy/IwOj3zVkVik2JTvgpaykDZEigL6Rx6N9LbMywwUSMtxET+7lVoDLLd3O3IXwJwvuuns8UB/HeAg==
 
-minimatch@^3.0.4:
+minimatch@^3.0, minimatch@^3.0.4:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
   integrity sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==