diff --git a/internal/core/domain/dependency.go b/internal/core/domain/dependency.go
index df0878a..997b18a 100644
--- a/internal/core/domain/dependency.go
+++ b/internal/core/domain/dependency.go
@@ -154,6 +154,15 @@ func (p *Dependency) GetKey() string {
 	return strings.ToLower(p.Repository)
 }
 
+// RepositoryName returns the normalized, collision-free name for a raw
+// repository string, ignoring protocol, credentials and a .git suffix.
+// Use it to compare user-supplied dependency arguments against boss.json
+// keys, which may or may not carry a protocol prefix.
+func RepositoryName(repo string) string {
+	d := Dependency{Repository: repo}
+	return d.Name()
+}
+
 // NeedsVersionUpdate checks if a version update is needed based on semver comparison.
 func NeedsVersionUpdate(currentVersion, newVersion string) bool {
 	parsedNew, err := semver.NewVersion(newVersion)
diff --git a/internal/core/domain/package.go b/internal/core/domain/package.go
index e19fadb..608d639 100644
--- a/internal/core/domain/package.go
+++ b/internal/core/domain/package.go
@@ -48,8 +48,9 @@ func NewPackage() *Package {
 
 // AddDependency adds or updates a dependency in the package.
 func (p *Package) AddDependency(dep string, ver string) {
+	depName := RepositoryName(dep)
 	for key := range p.Dependencies {
-		if strings.EqualFold(key, dep) {
+		if strings.EqualFold(key, dep) || strings.EqualFold(RepositoryName(key), depName) {
 			p.Dependencies[key] = ver
 			return
 		}
@@ -74,8 +75,9 @@ func (p *Package) GetParsedDependencies() []Dependency {
 // UninstallDependency removes a dependency from the package.
 func (p *Package) UninstallDependency(dep string) {
 	if p.Dependencies != nil {
+		depName := RepositoryName(dep)
 		for key := range p.Dependencies {
-			if strings.EqualFold(key, dep) {
+			if strings.EqualFold(key, dep) || strings.EqualFold(RepositoryName(key), depName) {
 				delete(p.Dependencies, key)
 				return
 			}
diff --git a/internal/core/services/installer/core.go b/internal/core/services/installer/core.go
index 3a1ca21..9e14e03 100644
--- a/internal/core/services/installer/core.go
+++ b/internal/core/services/installer/core.go
@@ -54,8 +54,7 @@ func newInstallContext(config env.ConfigProvider, pkg *domain.Package, options I
 	requestedDeps := make(map[string]bool)
 	if len(options.Args) > 0 {
 		for _, arg := range options.Args {
-			normalized := ParseDependency(arg)
-			requestedDeps[normalized] = true
+			requestedDeps[strings.ToLower(requestedDependencyName(arg))] = true
 		}
 	}
 
@@ -172,9 +171,12 @@ func collectDependenciesToInstall(pkg *domain.Package, args []string) []domain.D
 
 	var filtered []domain.Dependency
 	for _, arg := range args {
-		normalized := ParseDependency(arg)
+		// Compare by normalized name: boss.json keys may lack the protocol
+		// prefix the user typed, and the argument may carry a version suffix
+		// (EnsureDependency strips both on save).
+		requestedName := requestedDependencyName(arg)
 		for _, dep := range allDeps {
-			if dep.Repository == normalized {
+			if strings.EqualFold(dep.Name(), requestedName) {
 				filtered = append(filtered, dep)
 				break
 			}
@@ -201,7 +203,7 @@ func (ic *installContext) ensureDependencies(pkg *domain.Package) ([]domain.Depe
 	var deps []domain.Dependency
 	if pkg == ic.root && len(ic.requestedDeps) > 0 {
 		for _, dep := range allDeps {
-			if ic.requestedDeps[dep.Repository] {
+			if ic.requestedDeps[strings.ToLower(dep.Name())] {
 				deps = append(deps, dep)
 			}
 		}
diff --git a/internal/core/services/installer/installer.go b/internal/core/services/installer/installer.go
index e323829..7ce5602 100644
--- a/internal/core/services/installer/installer.go
+++ b/internal/core/services/installer/installer.go
@@ -62,6 +62,11 @@ func UninstallModules(args []string, noSave bool) {
 
 	for _, arg := range args {
 		dependencyRepository := ParseDependency(arg)
+		// Drop any ":version"/"@version" suffix so the argument matches the
+		// stored key regardless of how the dependency was installed.
+		if url, _ := parseURLAndVersion(dependencyRepository); url != "" {
+			dependencyRepository = url
+		}
 		pkg.UninstallDependency(dependencyRepository)
 	}
 
diff --git a/internal/core/services/installer/utils.go b/internal/core/services/installer/utils.go
index 5b994c4..15f4545 100644
--- a/internal/core/services/installer/utils.go
+++ b/internal/core/services/installer/utils.go
@@ -59,6 +59,18 @@ func parseURLAndVersion(input string) (string, string) {
 	return url, version
 }
 
+// requestedDependencyName normalizes a user-supplied dependency argument —
+// optionally carrying a ":version" or "@version" suffix — to the same
+// collision-free name boss.json keys resolve to.
+func requestedDependencyName(arg string) string {
+	parsed := ParseDependency(arg)
+	url, _ := parseURLAndVersion(parsed)
+	if url == "" {
+		url = parsed
+	}
+	return domain.RepositoryName(url)
+}
+
 // EnsureDependency ensures that the dependencies are added to the package.
 func EnsureDependency(pkg *domain.Package, args []string) {
 	for _, dependency := range args {