diff --git a/Gemfile.lock b/Gemfile.lock
index da57fbb..1a2d933 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     rbs-inline (0.11.0)
-      prism (>= 0.29, < 1.3)
+      prism (>= 0.29, < 1.6)
       rbs (>= 3.5.0)
 
 GEM
@@ -44,7 +44,7 @@ GEM
     parser (3.3.7.2)
       ast (~> 2.4.1)
       racc
-    prism (1.2.0)
+    prism (1.5.1)
     racc (1.8.1)
     rainbow (3.1.1)
     rake (13.2.1)
diff --git a/rbs-inline.gemspec b/rbs-inline.gemspec
index e3f9fb4..357497c 100644
--- a/rbs-inline.gemspec
+++ b/rbs-inline.gemspec
@@ -28,6 +28,6 @@ Gem::Specification.new do |spec|
   spec.executables = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "prism", ">= 0.29", "< 1.3"
+  spec.add_dependency "prism", ">= 0.29", "< 1.6"
   spec.add_dependency "rbs", ">= 3.5.0"
 end