diff --git a/Documentation/compatibility.md b/Documentation/compatibility.md
index c60c78dd3..9119ce0a8 100644
--- a/Documentation/compatibility.md
+++ b/Documentation/compatibility.md
@@ -55,12 +55,13 @@ Prometheus Operator supports all Prometheus versions >= v2.0.0. The operator's e
 * v2.55.1
 * v3.0.0
 * v3.0.1
+* v3.1.0
 ```
 
 The end-to-end tests are mostly tested against
 
 ```$ mdox-exec="go run ./cmd/po-docgen/. compatibility defaultPrometheusVersion"
-* v3.0.1
+* v3.1.0
 ```
 
 ## Alertmanager
diff --git a/pkg/operator/defaults.go b/pkg/operator/defaults.go
index bf9490f6b..ab1f78159 100644
--- a/pkg/operator/defaults.go
+++ b/pkg/operator/defaults.go
@@ -81,6 +81,7 @@ var (
 		"v2.55.1",
 		"v3.0.0",
 		"v3.0.1",
+		"v3.1.0",
 	}
 )