diff --git a/stackit/internal/validate/validate.go b/stackit/internal/validate/validate.go
index 358fc6d3f..3ebf658da 100644
--- a/stackit/internal/validate/validate.go
+++ b/stackit/internal/validate/validate.go
@@ -24,7 +24,10 @@ import (
 
 const (
 	MajorMinorVersionRegex = `^\d+\.\d+?$`
-	FullVersionRegex       = `^\d+\.\d+.\d+?$`
+	FullVersionRegex       = `^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)` +
+		`(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)` +
+		`(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?` +
+		`(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$`
 )
 
 type Validator struct {
diff --git a/stackit/internal/validate/validate_test.go b/stackit/internal/validate/validate_test.go
index 60dd83b45..1f0cdced9 100644
--- a/stackit/internal/validate/validate_test.go
+++ b/stackit/internal/validate/validate_test.go
@@ -551,6 +551,26 @@ func TestVersionNumber(t *testing.T) {
 			"10.20.10",
 			true,
 		},
+		{
+			"ok-patch-version-prerelease",
+			"1.20.1-alpha",
+			true,
+		},
+		{
+			"ok-patch-version-prerelease-with-dot-separator",
+			"1.20.1-alpha.1",
+			true,
+		},
+		{
+			"ok-patch-version-prerelease-without-dot-separator",
+			"1.20.1-alpha1.2",
+			true,
+		},
+		{
+			"version-ends-with-dot",
+			"1.20.1-alpha.1.",
+			false,
+		},
 		{
 			"Empty",
 			"",