diff --git a/.github/workflows/deno-ci.yml b/.github/workflows/deno-ci.yml
index cf145ad..98bbf35 100644
--- a/.github/workflows/deno-ci.yml
+++ b/.github/workflows/deno-ci.yml
@@ -14,8 +14,7 @@ jobs:
     strategy:
       matrix:
         deno-version:
-        - v1.15
-        - v1.16
+        - v1.23
         - canary
       fail-fast: false # run each branch to completion
 
@@ -48,7 +47,7 @@ jobs:
         restore-keys: deno-https/v1-
 
     - name: Check entrypoint
-      run: time deno cache server.ts
+      run: time deno cache --check=all server.ts
 
     - name: Run any tests
       run: time deno test
diff --git a/Dockerfile b/Dockerfile
index 07cd07f..d6e7abc 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,10 +1,10 @@
-FROM denoland/deno:alpine-1.16.4
+FROM denoland/deno:alpine-1.23.3
 RUN apk add --no-cache graphviz
 ADD fonts/ /usr/share/fonts/truetype/
 
 WORKDIR /src
 ADD deps.ts .
-RUN deno cache deps.ts
+RUN deno cache --check=all deps.ts
 ADD . .
-RUN deno cache server.ts
+RUN deno cache --check=all server.ts
 ENTRYPOINT ["deno","run","--allow-env","--allow-net=0.0.0.0,api.github.com,cdn.deno.land,registry.npmjs.org","--allow-run=deno,dot","--allow-read=.","server.ts"]
diff --git a/lib/module-map.ts b/lib/module-map.ts
index 4ecaecc..2d7827f 100644
--- a/lib/module-map.ts
+++ b/lib/module-map.ts
@@ -50,10 +50,10 @@ export class ModuleMap {
       return;
     }
 
-    const depEdges = info.dependencies.flatMap(x => [
+    const depEdges = info.dependencies?.flatMap(x => [
       x.code?.specifier ?? '',
       x.type?.specifier ?? '',
-    ].filter(x => x));
+    ].filter(x => x)) ?? [];
     if (info.typesDependency?.dependency.specifier) {
       depEdges.push(info.typesDependency.dependency.specifier);
     }
diff --git a/lib/types.ts b/lib/types.ts
index dfe38c4..5f60d81 100644
--- a/lib/types.ts
+++ b/lib/types.ts
@@ -32,7 +32,7 @@ interface DenoModuleError {
 }
 export type DenoModule = {
   specifier:        string;
-  dependencies:     DenoDependency[];
+  dependencies?:    DenoDependency[];
   typesDependency?: {
     specifier:        string;
     dependency:       { specifier: string }; // also the span
diff --git a/server.ts b/server.ts
index a569d39..0162d70 100755
--- a/server.ts
+++ b/server.ts
@@ -1,4 +1,4 @@
-#!/usr/bin/env -S deno run --allow-read=. --allow-net=0.0.0.0 --allow-run=deno,dot --allow-env=PORT
+#!/usr/bin/env -S deno run --check=all --allow-read=. --allow-net=0.0.0.0 --allow-run=deno,dot --allow-env=PORT
 
 import { http } from "./deps.ts";
 import { serveFont, servePublic, serveTemplatedHtml } from './lib/request-handling.ts';