diff --git a/composer.json b/composer.json
index 44771f20..c653ff91 100644
--- a/composer.json
+++ b/composer.json
@@ -53,7 +53,7 @@
         "phpunit/phpunit": "^10.4",
         "psalm/plugin-phpunit": "^0.18.4",
         "symfony/console": "^6.0",
-        "vimeo/psalm": "^5.10"
+        "vimeo/psalm": "5.x-dev#f1fc9c4 as 5.16"
     },
     "provide": {
         "psr/container-implementation": "^1.0 || ^2.0"
diff --git a/composer.lock b/composer.lock
index fdcaa4ef..6f9c30ff 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "d241bbfd820f8a36cabd6da1c031e520",
+    "content-hash": "06ff08e02a2b11f15799caac0a6ba454",
     "packages": [
         {
             "name": "brick/varexporter",
@@ -5246,16 +5246,16 @@
         },
         {
             "name": "vimeo/psalm",
-            "version": "5.15.0",
+            "version": "5.x-dev",
             "source": {
                 "type": "git",
                 "url": "https://github.com/vimeo/psalm.git",
-                "reference": "5c774aca4746caf3d239d9c8cadb9f882ca29352"
+                "reference": "f1fc9c4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/vimeo/psalm/zipball/5c774aca4746caf3d239d9c8cadb9f882ca29352",
-                "reference": "5c774aca4746caf3d239d9c8cadb9f882ca29352",
+                "url": "https://api.github.com/repos/vimeo/psalm/zipball/f1fc9c4",
+                "reference": "f1fc9c4",
                 "shasum": ""
             },
             "require": {
@@ -5309,6 +5309,7 @@
                 "ext-curl": "In order to send data to shepherd",
                 "ext-igbinary": "^2.0.5 is required, used to serialize caching data"
             },
+            "default-branch": true,
             "bin": [
                 "psalm",
                 "psalm-language-server",
@@ -5316,7 +5317,7 @@
                 "psalm-refactor",
                 "psalter"
             ],
-            "type": "library",
+            "type": "project",
             "extra": {
                 "branch-alias": {
                     "dev-master": "5.x-dev",
@@ -5348,10 +5349,11 @@
                 "static analysis"
             ],
             "support": {
+                "docs": "https://psalm.dev/docs",
                 "issues": "https://github.com/vimeo/psalm/issues",
-                "source": "https://github.com/vimeo/psalm/tree/5.15.0"
+                "source": "https://github.com/vimeo/psalm"
             },
-            "time": "2023-08-20T23:07:30+00:00"
+            "time": "2023-10-09T17:48:20+00:00"
         },
         {
             "name": "webimpress/coding-standard",
@@ -5516,10 +5518,18 @@
             "time": "2022-05-24T19:45:58+00:00"
         }
     ],
-    "aliases": [],
+    "aliases": [
+        {
+            "package": "vimeo/psalm",
+            "version": "5.9999999.9999999.9999999-dev",
+            "alias": "5.16",
+            "alias_normalized": "5.16.0.0"
+        }
+    ],
     "minimum-stability": "stable",
     "stability-flags": {
-        "mikey179/vfsstream": 15
+        "mikey179/vfsstream": 15,
+        "vimeo/psalm": 20
     },
     "prefer-stable": false,
     "prefer-lowest": false,