diff --git a/ghost/admin/package.json b/ghost/admin/package.json
index 8728d60492..6b659b9cef 100644
--- a/ghost/admin/package.json
+++ b/ghost/admin/package.json
@@ -33,7 +33,7 @@
     "@tryghost/kg-clean-basic-html": "0.1.3",
     "@tryghost/kg-parser-plugins": "0.7.0",
     "@tryghost/mobiledoc-kit": "0.11.2-ghost.4",
-    "@tryghost/string": "^0.1.5",
+    "@tryghost/string": "0.1.5",
     "@tryghost/timezone-data": "0.2.7",
     "autoprefixer": "9.6.1",
     "blueimp-md5": "2.11.1",
diff --git a/ghost/admin/yarn.lock b/ghost/admin/yarn.lock
index 061dbe50a2..3a47dd8676 100644
--- a/ghost/admin/yarn.lock
+++ b/ghost/admin/yarn.lock
@@ -1024,7 +1024,7 @@
     mobiledoc-dom-renderer "0.6.5"
     mobiledoc-text-renderer "0.3.2"
 
-"@tryghost/string@^0.1.5":
+"@tryghost/string@0.1.5":
   version "0.1.5"
   resolved "https://registry.yarnpkg.com/@tryghost/string/-/string-0.1.5.tgz#adc67ce449e66e61a2d14b0815a14a5174465549"
   integrity sha512-zbD/C+I7PXZfRkki80yK+jWMyNaklKLj7wdoQd81+r5ARGGar0XtWL/T1zc6G2UI/v9UW+dLQ5mDxpsxQIEFlA==