diff --git a/cmd/comparecache/main.go b/cmd/comparecache/main.go
index 5a17b78..2dbc8a9 100644
--- a/cmd/comparecache/main.go
+++ b/cmd/comparecache/main.go
@@ -556,6 +556,11 @@ func normalizeVersionFunc(pkg string) func(string) string {
 			}
 			return v
 		}
+	case "watchexec":
+		return func(v string) string {
+			// watchexec monorepo: cli-v1.20.5 → v1.20.5
+			return strings.TrimPrefix(v, "cli-")
+		}
 	case "go":
 		return func(v string) string {
 			// Go: go1.10 → 1.10.0 (pad to 3 parts)
diff --git a/internal/classifypkg/classifypkg.go b/internal/classifypkg/classifypkg.go
index 2fe25a6..c7effe9 100644
--- a/internal/classifypkg/classifypkg.go
+++ b/internal/classifypkg/classifypkg.go
@@ -231,6 +231,9 @@ func classifyGitHub(pkg string, conf *installerconf.Conf, d *rawcache.Dir) ([]st
 
 		version := rel.TagName
 		if tagPrefix != "" {
+			if !strings.HasPrefix(version, tagPrefix) {
+				continue // skip tags from other packages in monorepos
+			}
 			version = strings.TrimPrefix(version, tagPrefix)
 		}
 
diff --git a/jq/releases.conf b/jq/releases.conf
index 73b3ef7..332c43a 100644
--- a/jq/releases.conf
+++ b/jq/releases.conf
@@ -1,3 +1,4 @@
 source = github
 owner = stedolan
 repo = jq
+version_prefixes = jq-
diff --git a/watchexec/releases.conf b/watchexec/releases.conf
index 947645f..421431d 100644
--- a/watchexec/releases.conf
+++ b/watchexec/releases.conf
@@ -1,3 +1,4 @@
 source = github
 owner = watchexec
 repo = watchexec
+tag_prefix = cli-