diff --git a/constraints-6.0.txt b/constraints-6.0.txt
index 404cebd..b514e9e 100644
--- a/constraints-6.0.txt
+++ b/constraints-6.0.txt
@@ -1,2 +1,3 @@
 -c https://dist.plone.org/release/6.0.6/constraints.txt
 plone.restapi>=8.40.0
+collective.solr>=9.4.0
\ No newline at end of file
diff --git a/constraints.txt b/constraints.txt
index 404cebd..5255bc1 100644
--- a/constraints.txt
+++ b/constraints.txt
@@ -1,2 +1,3 @@
 -c https://dist.plone.org/release/6.0.6/constraints.txt
 plone.restapi>=8.40.0
+collective.solr>=9.4.0