diff --git a/Makefile b/Makefile
index e16a8b4..b6469f4 100644
--- a/Makefile
+++ b/Makefile
@@ -39,7 +39,7 @@ lint: $(BIN)/buf ## Lint all APIs
 
 .PHONY: upgrade
 upgrade: $(BIN)/buf ## Upgrade dependencies
-	buf mod update
+	buf dep update
 
 .PHONY: generate
 generate: $(BIN)/buf $(BIN)/license-header ## Format and regenerate license headers
diff --git a/buf.lock b/buf.lock
index 186cc36..6013ba0 100644
--- a/buf.lock
+++ b/buf.lock
@@ -2,5 +2,5 @@
 version: v2
 deps:
   - name: buf.build/bufbuild/protovalidate
-    commit: a6c49f84cc0f4e038680d390392e2ab0
-    digest: b5:e968392e88ff7915adcbd1635d670b45bff8836ec2415d81fc559ca5470a695dbdc30030bad8bc5764647c731079e9e7bba0023ea25c4e4a1672a7d2561d4a19
+    commit: 6c6e0d3c608e4549802254a2eee81bc8
+    digest: b5:a7ca081f38656fc0f5aaa685cc111d3342876723851b47ca6b80cbb810cbb2380f8c444115c495ada58fa1f85eff44e68dc54a445761c195acdb5e8d9af675b6
diff --git a/buf/plugin/info/v1/license.proto b/buf/plugin/info/v1/license.proto
index b971345..f47416b 100644
--- a/buf/plugin/info/v1/license.proto
+++ b/buf/plugin/info/v1/license.proto
@@ -28,7 +28,7 @@ message License {
   string spdx_license_id = 1 [
     (buf.validate.field).string.min_len = 1,
     (buf.validate.field).string.pattern = "^[a-zA-Z0-9-.+]+$",
-    (buf.validate.field).ignore = IGNORE_IF_UNPOPULATED
+    (buf.validate.field).ignore = IGNORE_IF_ZERO_VALUE
   ];
   // The source of a license is either raw text, or a URL that contains the license.
   oneof source {
@@ -38,7 +38,7 @@ message License {
     string text = 2;
     // The url that contains the license.
     string url = 3 [
-      (buf.validate.field).ignore = IGNORE_IF_UNPOPULATED,
+      (buf.validate.field).ignore = IGNORE_IF_ZERO_VALUE,
       (buf.validate.field).string.uri = true
     ];
   }