diff --git a/composer.json b/composer.json
index acb71c01..7bc14d9a 100644
--- a/composer.json
+++ b/composer.json
@@ -17,6 +17,7 @@
         "drupal/group_content_menu": "^2.0",
         "drupal/hdbt": "^5.0",
         "drupal/hdbt_admin": "^2.0",
+        "drupal/helfi_api_base": "dev-UHF-9113-drupal-10-support",
         "drupal/helfi_azure_fs": "^2.0",
         "drupal/helfi_drupal_tools": "dev-main",
         "drupal/helfi_navigation": "^2.0",
diff --git a/composer.lock b/composer.lock
index e95441af..47d13813 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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+    "content-hash": "1ab97b069faf62206e975d07522bb403",
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@@ -4043,16 +4043,16 @@
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         {
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-            "version": "2.5.8",
+            "version": "dev-UHF-9113-drupal-10-support",
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                 "url": "https://github.com/City-of-Helsinki/drupal-module-helfi-api-base.git",
-                "reference": "c8ed69e045bae960fff5b71179d09f62ea53651a"
+                "reference": "70a22d769b999fa691f0244c7c14a458b670da0d"
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-                "url": "https://api.github.com/repos/City-of-Helsinki/drupal-module-helfi-api-base/zipball/c8ed69e045bae960fff5b71179d09f62ea53651a",
-                "reference": "c8ed69e045bae960fff5b71179d09f62ea53651a",
+                "url": "https://api.github.com/repos/City-of-Helsinki/drupal-module-helfi-api-base/zipball/70a22d769b999fa691f0244c7c14a458b670da0d",
+                "reference": "70a22d769b999fa691f0244c7c14a458b670da0d",
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@@ -4062,7 +4062,8 @@
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                 "php": "^8.1",
                 "t4web/composer-lock-parser": "^1.0",
-                "textalk/websocket": "^1.6"
+                "textalk/websocket": "^1.6",
+                "webmozart/assert": "^1.0"
             },
             "conflict": {
                 "drupal/helfi_debug": "*"
@@ -4078,10 +4079,10 @@
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             "description": "Helfi - API Base",
             "support": {
-                "source": "https://github.com/City-of-Helsinki/drupal-module-helfi-api-base/tree/2.5.8",
+                "source": "https://github.com/City-of-Helsinki/drupal-module-helfi-api-base/tree/UHF-9113-drupal-10-support",
                 "issues": "https://github.com/City-of-Helsinki/drupal-module-helfi-api-base/issues"
             },
-            "time": "2023-10-18T05:44:50+00:00"
+            "time": "2023-10-30T13:20:30+00:00"
         },
         {
             "name": "drupal/helfi_azure_fs",
@@ -14451,6 +14452,64 @@
                 "source": "https://github.com/webflo/drupal-finder/tree/1.2.2"
             },
             "time": "2020-10-27T09:42:17+00:00"
+        },
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+            "version": "1.11.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/webmozarts/assert.git",
+                "reference": "11cb2199493b2f8a3b53e7f19068fc6aac760991"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/webmozarts/assert/zipball/11cb2199493b2f8a3b53e7f19068fc6aac760991",
+                "reference": "11cb2199493b2f8a3b53e7f19068fc6aac760991",
+                "shasum": ""
+            },
+            "require": {
+                "ext-ctype": "*",
+                "php": "^7.2 || ^8.0"
+            },
+            "conflict": {
+                "phpstan/phpstan": "<0.12.20",
+                "vimeo/psalm": "<4.6.1 || 4.6.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^8.5.13"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.10-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Webmozart\\Assert\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Bernhard Schussek",
+                    "email": "bschussek@gmail.com"
+                }
+            ],
+            "description": "Assertions to validate method input/output with nice error messages.",
+            "keywords": [
+                "assert",
+                "check",
+                "validate"
+            ],
+            "support": {
+                "issues": "https://github.com/webmozarts/assert/issues",
+                "source": "https://github.com/webmozarts/assert/tree/1.11.0"
+            },
+            "time": "2022-06-03T18:03:27+00:00"
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     ],
     "packages-dev": [
@@ -18676,64 +18735,6 @@
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             "time": "2021-07-28T10:34:58+00:00"
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-        {
-            "name": "webmozart/assert",
-            "version": "1.11.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/webmozarts/assert.git",
-                "reference": "11cb2199493b2f8a3b53e7f19068fc6aac760991"
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-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/webmozarts/assert/zipball/11cb2199493b2f8a3b53e7f19068fc6aac760991",
-                "reference": "11cb2199493b2f8a3b53e7f19068fc6aac760991",
-                "shasum": ""
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-            "require": {
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-                "php": "^7.2 || ^8.0"
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-                "vimeo/psalm": "<4.6.1 || 4.6.2"
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-            "type": "library",
-            "extra": {
-                "branch-alias": {
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-                }
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-            "autoload": {
-                "psr-4": {
-                    "Webmozart\\Assert\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Bernhard Schussek",
-                    "email": "bschussek@gmail.com"
-                }
-            ],
-            "description": "Assertions to validate method input/output with nice error messages.",
-            "keywords": [
-                "assert",
-                "check",
-                "validate"
-            ],
-            "support": {
-                "issues": "https://github.com/webmozarts/assert/issues",
-                "source": "https://github.com/webmozarts/assert/tree/1.11.0"
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-            "time": "2022-06-03T18:03:27+00:00"
-        },
         {
             "name": "weitzman/drupal-test-traits",
             "version": "2.2.0",
@@ -18791,6 +18792,7 @@
     "aliases": [],
     "minimum-stability": "dev",
     "stability-flags": {
+        "drupal/helfi_api_base": 20,
         "drupal/helfi_drupal_tools": 20,
         "drupal/helfi_platform_config": 20
     },