diff --git a/Rakefile b/Rakefile
index ebc2abc6e..92eaff3a6 100644
--- a/Rakefile
+++ b/Rakefile
@@ -203,8 +203,8 @@ task :validate => :compile do
     args = ["-r", lib]
 
     if lib == "rbs"
-      args << "-r"
-      args << "prism"
+      args << "-r" << "prism"
+      args << "-r" << "logger"
     end
 
     sh "#{ruby} #{rbs} #{args.join(' ')} validate"
diff --git a/sig/manifest.yaml b/sig/manifest.yaml
index 8c2a6849c..860df140d 100644
--- a/sig/manifest.yaml
+++ b/sig/manifest.yaml
@@ -1,5 +1,4 @@
 dependencies:
-  - name: logger
   - name: json
   - name: optparse
   - name: tsort