diff --git a/package.json b/package.json
index c97f6d5..f016ec1 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "emotion": "^11.0.0",
     "fast-xml-parser": "^4.0.7",
     "geolib": "^3.3.3",
-    "gsl-parser": "^2.0.0",
+    "gsl-parser": "^3.0.0",
     "i18next": "^22.5.0",
     "i18next-browser-languagedetector": "^7.0.1",
     "iso8601-duration": "^2.1.1",
diff --git a/src/services/rapidRefresh.ts b/src/services/rapidRefresh.ts
index 382f211..e2e27ee 100644
--- a/src/services/rapidRefresh.ts
+++ b/src/services/rapidRefresh.ts
@@ -44,7 +44,10 @@ function transformRapToWindsAloft(rap: Rap[]): WindsAloftReport {
           temperatureInC: temp / 10,
           altitudeInM: height,
           pressure: Math.round(pressure / 10),
-          dewpointInC: dewpt / 10,
+
+          // Based on everything I've seen, invalid dewpt values are
+          // due to extremely low dewpts. So just set to -100°C.
+          dewpointInC: dewpt != null ? dewpt / 10 : -100,
         })
       ),
     })),
diff --git a/vite.config.ts b/vite.config.ts
index 8e0035b..fa4a09a 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -8,7 +8,7 @@ import eslint from "vite-plugin-eslint";
 export default defineConfig(() => {
   return {
     optimizeDeps: {
-      include: ["metar-taf-parser"],
+      include: ["metar-taf-parser", "gsl-parser"],
     },
     build: {
       outDir: "build",
diff --git a/yarn.lock b/yarn.lock
index 4c0bb72..f881cfe 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5006,10 +5006,10 @@ graphemer@^1.4.0:
   resolved "https://registry.yarnpkg.com/graphemer/-/graphemer-1.4.0.tgz#fb2f1d55e0e3a1849aeffc90c4fa0dd53a0e66c6"
   integrity sha512-EtKwoO6kxCL9WO5xipiHTZlSzBm7WLT627TqC/uVRd0HKmq8NXyebnNYxDoBi7wt8eTWrUrKXCOVaFq9x1kgag==
 
-gsl-parser@^2.0.0:
-  version "2.0.3"
-  resolved "https://registry.yarnpkg.com/gsl-parser/-/gsl-parser-2.0.3.tgz#6bd0c1564ef6e64ef45c470be0253daefd9e9485"
-  integrity sha512-bkYMVgW6s8KZ6Qne8mQ2Nrkl3nmjOiuScMbYtqjJe+Z9myRTzcLsMdRt1e3vmHWOJRd3yHFUS79P7T8qCJk3vA==
+gsl-parser@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/gsl-parser/-/gsl-parser-3.0.0.tgz#fbdef891ec6726316a8c9dcda01ebd6225efa4b8"
+  integrity sha512-xa9FEilxqwHm1ZtcH07AeuwDexVmbdEtdSkGrHaDpbS3LG+X0+mZC1dA6gqi4PRXNcOguBjiOdGTSL8JrLlWcA==
 
 gzip-size@^6.0.0:
   version "6.0.0"