diff --git a/tests/version_test.go b/tests/version_test.go
index bef680f..ec98474 100644
--- a/tests/version_test.go
+++ b/tests/version_test.go
@@ -57,10 +57,34 @@ func TestSameVersion(t *testing.T) {
 	ctx, client, stop := setup()
 	defer stop()
 
-	modID := RunVersionTest(ctx, t, client, "testdata/DuplicateMod.smod", false, "DuplicateMod", "", "")
+	modID, _ := RunVersionTest(ctx, t, client, "testdata/DuplicateMod.smod", false, "DuplicateMod", "", "")
 	RunVersionTest(ctx, t, client, "testdata/DuplicateMod.smod", false, "DuplicateMod", modID, "this mod already has a version with this name")
 }
 
+func TestSameSemver(t *testing.T) {
+	ctx, client, stop := setup()
+	defer stop()
+
+	modID, versionID := RunVersionTest(ctx, t, client, "testdata/DuplicateMod.smod", false, "DuplicateMod", "", "")
+	//NEED TO SOMEHOW DELETE THE MOD
+
+	token, _, err := makeUser(ctx)
+	testza.AssertNoError(t, err)
+
+	deleteRequest := authRequest(`mutation DeleteVersion($versionId: VersionID!) {
+		deleteVersion(versionId: $versionId)
+	}`, token)
+	deleteRequest.Var("versionId", versionID)
+
+	var deleteResponse struct {
+		DeleteVersion bool
+	}
+	testza.AssertNoError(t, client.Run(ctx, deleteRequest, &deleteResponse))
+	testza.AssertTrue(t, deleteResponse.DeleteVersion)
+
+	RunVersionTest(ctx, t, client, "testdata/DuplicateMod.smod", false, "DuplicateMod", modID, "this mod already has a version with this semver")
+}
+
 func TestModWithMissingDependency(t *testing.T) {
 	RunVersionTestWrapper(t, "testdata/ModWithMissingDependency.smod", false, "ModWithMissingDependency", "ent: mod not found")
 }
@@ -75,11 +99,11 @@ func RunVersionTestWrapper(t *testing.T, modFilePath string, executeVirusCheck b
 	RunVersionTest(ctx, t, client, modFilePath, executeVirusCheck, modReference, "", expectError)
 }
 
-func RunVersionTest(ctx context.Context, t *testing.T, client *graphql.Client, modFilePath string, executeVirusCheck bool, modReference string, reuseModID string, expectError string) string {
+func RunVersionTest(ctx context.Context, t *testing.T, client *graphql.Client, modFilePath string, executeVirusCheck bool, modReference string, reuseModID string, expectError string) (string, string) {
 	if executeVirusCheck && (!viper.IsSet("virustotal.key") || viper.GetString("virustotal.key") == "") {
 		println("missing virustotal key from config, skipping")
 		t.SkipNow()
-		return ""
+		return "", ""
 	}
 
 	viper.Set("skip-virus-check", !executeVirusCheck)
@@ -394,5 +418,5 @@ func RunVersionTest(ctx context.Context, t *testing.T, client *graphql.Client, m
 		})
 	}
 
-	return modID
+	return modID, versionID
 }
diff --git a/workflows/versionupload/extract_mod_info.go b/workflows/versionupload/extract_mod_info.go
index 6663fce..965996f 100644
--- a/workflows/versionupload/extract_mod_info.go
+++ b/workflows/versionupload/extract_mod_info.go
@@ -11,6 +11,7 @@ import (
 	"go.temporal.io/sdk/temporal"
 
 	"github.com/satisfactorymodding/smr-api/db"
+	"github.com/satisfactorymodding/smr-api/db/schema"
 	version2 "github.com/satisfactorymodding/smr-api/generated/ent/version"
 	"github.com/satisfactorymodding/smr-api/util"
 	"github.com/satisfactorymodding/smr-api/validation"
@@ -62,6 +63,29 @@ func (*A) ExtractModInfoActivity(ctx context.Context, args ExtractModInfoArgs) (
 		return nil, temporal.NewNonRetryableApplicationError("this mod already has a version with this name", "fatal", nil)
 	}
 
+	if modInfo.Semver != nil {
+		major := int(modInfo.Semver.Major())
+		minor := int(modInfo.Semver.Minor())
+		patch := int(modInfo.Semver.Patch())
+
+		semverCount, err := db.From(schema.SkipSoftDelete(ctx)).Version.Query().
+			Where(
+				version2.ModID(mod.ID),
+				version2.VersionMajor(major),
+				version2.VersionMinor(minor),
+				version2.VersionPatch(patch),
+				version2.DeletedAtNotNil(),
+			).
+			Count(ctx)
+		if err != nil {
+			return nil, temporal.NewNonRetryableApplicationError("database error", "fatal", err)
+		}
+
+		if semverCount > 0 {
+			return nil, temporal.NewNonRetryableApplicationError("this mod already has a version with this semver", "fatal", nil)
+		}
+	}
+
 	// Allow only new 5 versions per 24h
 	versions, err := db.From(ctx).Version.Query().
 		Order(version2.ByCreatedAt(sql.OrderAsc())).