diff --git a/composer.json b/composer.json
index 58c46b3..9992412 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
         "silverstripe/framework": "^4.10",
         "monolog/monolog": "~1.15",
         "ptcinc/solr-php-client": "^1.0",
-        "symfony/process": "^3.2 || ^4",
+        "symfony/process": "^3.4 || ^4",
         "tractorcow/silverstripe-proxy-db": "~0.1",
         "ext-curl": "*"
     },