diff --git a/Gemfile.lock b/Gemfile.lock
index ba265a0..8a149c2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -22,8 +22,9 @@ GEM
     racc (1.8.1)
     rainbow (3.1.1)
     rake (13.4.2)
-    rbs (3.10.4)
+    rbs (4.1.3)
       logger
+      prism (>= 1.6.0)
       tsort
     regexp_parser (2.13.0)
     rexml (3.4.4)
@@ -69,7 +70,7 @@ DEPENDENCIES
   csv
   inkplot!
   rake (~> 13.0)
-  rbs (~> 3.0)
+  rbs (~> 4.1)
   rexml
   rspec (~> 3.0)
   rubocop (~> 1.0)
@@ -91,7 +92,7 @@ CHECKSUMS
   racc (1.8.1) sha256=4a7f6929691dbec8b5209a0b373bc2614882b55fc5d2e447a21aaa691303d62f
   rainbow (3.1.1) sha256=039491aa3a89f42efa1d6dec2fc4e62ede96eb6acd95e52f1ad581182b79bc6a
   rake (13.4.2) sha256=cb825b2bd5f1f8e91ca37bddb4b9aaf345551b4731da62949be002fa89283701
-  rbs (3.10.4) sha256=b17d7c4be4bb31a11a3b529830f0aa206a807ca42f2e7921a3027dfc6b7e5ce8
+  rbs (4.1.3) sha256=0c4474a9751cdc14364bfad0b3e53678323bbdc2c31683b0445932867dbab8c4
   regexp_parser (2.13.0) sha256=d105d95d2138954e73914d2fbfb3d0a8f8605a49a3e89864c32e78b9107cb770
   rexml (3.4.4) sha256=19e0a2c3425dfbf2d4fc1189747bdb2f849b6c5e74180401b15734bc97b5d142
   rspec (3.13.2) sha256=206284a08ad798e61f86d7ca3e376718d52c0bc944626b2349266f239f820587
diff --git a/inkplot.gemspec b/inkplot.gemspec
index ecfac04..c728d6e 100644
--- a/inkplot.gemspec
+++ b/inkplot.gemspec
@@ -32,7 +32,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_development_dependency "rake", "~> 13.0"
-  spec.add_development_dependency "rbs", "~> 3.0"
+  spec.add_development_dependency "rbs", "~> 4.1"
   spec.add_development_dependency "rspec", "~> 3.0"
   spec.add_development_dependency "rubocop", "~> 1.0"