diff --git a/package-lock.json b/package-lock.json
index 52cdf0efe..cf5291770 100644
--- a/package-lock.json
+++ b/package-lock.json
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+          "version": "3.8.1",
+          "resolved": "https://registry.npmjs.org/core-js/-/core-js-3.8.1.tgz",
+          "integrity": "sha512-9Id2xHY1W7m8hCl8NkhQn5CufmF/WuR30BTRewvCXc1aZd3kMECwNZ69ndLbekKfakw9Rf2Xyc+QR6E7Gg+obg=="
         }
       }
     },
@@ -23582,9 +23328,9 @@
       }
     },
     "style-mod": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/style-mod/-/style-mod-3.1.0.tgz",
-      "integrity": "sha512-0N9E+FSiBMBgwek1njE4Vt2WMmWZReTrKfCY6xUCXuHLJcjXxJrPG504dH2oufQHhEZp0aZs3v/uVHRz5LepTA=="
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/style-mod/-/style-mod-3.2.0.tgz",
+      "integrity": "sha512-U8aygkBSFYXvWnOj49TEGa1baShfvoN2wOkbnfmu7UBmzj7Y3Zz13MnOdrdBVFyAq4UIgFN2+9RRCzucZH1oDA=="
     },
     "supports-color": {
       "version": "5.5.0",
diff --git a/package.json b/package.json
index 75588ac75..33774b528 100644
--- a/package.json
+++ b/package.json
@@ -48,7 +48,7 @@
     "@stencila/executa": "^1.15.4",
     "@stencila/logga": "^3.0.1",
     "@stencila/schema": "^0.47.2",
-    "@stencila/thema": "^2.20.4",
+    "@stencila/thema": "^2.20.7",
     "ajv": "^6.12.6",
     "appdata-path": "^1.0.0",
     "asciimath2tex": "https://github.com/christianp/asciimath2tex/tarball/dedc42ddfdb80678bfb09864cfa76afb0a4b5f44",