diff --git a/dist/index.js b/dist/index.js
index 70335d76..2f059b6a 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -111230,8 +111230,8 @@ function composeCollection(CN, ctx, token, props, onError) {
             tag = kt;
         }
         else {
-            if (kt?.collection) {
-                onError(tagToken, 'BAD_COLLECTION_TYPE', `${kt.tag} used for ${expType} collection, but expects ${kt.collection}`, true);
+            if (kt) {
+                onError(tagToken, 'BAD_COLLECTION_TYPE', `${kt.tag} used for ${expType} collection, but expects ${kt.collection ?? 'scalar'}`, true);
             }
             else {
                 onError(tagToken, 'TAG_RESOLVE_FAILED', `Unresolved tag: ${tagName}`, true);
@@ -116696,7 +116696,20 @@ class Parser {
                 default: {
                     const bv = this.startBlockValue(map);
                     if (bv) {
-                        if (atMapIndent && bv.type !== 'block-seq') {
+                        if (bv.type === 'block-seq') {
+                            if (!it.explicitKey &&
+                                it.sep &&
+                                !includesToken(it.sep, 'newline')) {
+                                yield* this.pop({
+                                    type: 'error',
+                                    offset: this.offset,
+                                    message: 'Unexpected block-seq-ind on same line with key',
+                                    source: this.source
+                                });
+                                return;
+                            }
+                        }
+                        else if (atMapIndent) {
                             map.items.push({ start });
                         }
                         this.stack.push(bv);
@@ -117635,6 +117648,8 @@ const binary = {
         }
     },
     stringify({ comment, type, value }, ctx, onComment, onChompKeep) {
+        if (!value)
+            return '';
         const buf = value; // checked earlier by binary.identify()
         let str;
         if (typeof node_buffer.Buffer === 'function') {
@@ -118358,7 +118373,7 @@ const timestamp = {
         }
         return new Date(date);
     },
-    stringify: ({ value }) => value.toISOString().replace(/(T00:00:00)?\.000Z$/, '')
+    stringify: ({ value }) => value?.toISOString().replace(/(T00:00:00)?\.000Z$/, '') ?? ''
 };
 
 exports.floatTime = floatTime;
diff --git a/package-lock.json b/package-lock.json
index 6d1f7a1e..af925a4e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,7 +12,7 @@
         "@actions/core": "^1.10.1",
         "@aws-sdk/client-codedeploy": "^3.758.0",
         "@aws-sdk/client-ecs": "^3.741.0",
-        "yaml": "^2.7.0"
+        "yaml": "^2.7.1"
       },
       "devDependencies": {
         "@eslint/js": "^9.23.0",
@@ -9816,9 +9816,10 @@
       "dev": true
     },
     "node_modules/yaml": {
-      "version": "2.7.0",
-      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.7.0.tgz",
-      "integrity": "sha512-+hSoy/QHluxmC9kCIJyL/uyFmLmc+e5CFR5Wa+bpIhIj85LVb9ZH2nVnqrHoSvKogwODv0ClqZkmiSSaIH5LTA==",
+      "version": "2.7.1",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.7.1.tgz",
+      "integrity": "sha512-10ULxpnOCQXxJvBgxsn9ptjq6uviG/htZKk9veJGhlqn3w/DxQ631zFF+nlQXLwmImeS5amR2dl2U8sg6U9jsQ==",
+      "license": "ISC",
       "bin": {
         "yaml": "bin.mjs"
       },
diff --git a/package.json b/package.json
index 8d36e237..275e9443 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,7 @@
     "@actions/core": "^1.10.1",
     "@aws-sdk/client-codedeploy": "^3.758.0",
     "@aws-sdk/client-ecs": "^3.741.0",
-    "yaml": "^2.7.0"
+    "yaml": "^2.7.1"
   },
   "devDependencies": {
     "@eslint/js": "^9.23.0",