diff --git a/Gemfile.lock b/Gemfile.lock
index 145b59862..fcd546984 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: middleman-cli
   specs:
     middleman-cli (4.5.1)
-      thor (>= 0.17.0, < 1.3.0)
+      thor (>= 0.17.0, < 1.4.0)
 
 PATH
   remote: middleman-core
@@ -219,7 +219,7 @@ GEM
     sys-uname (1.2.3)
       ffi (~> 1.1)
     temple (0.8.2)
-    thor (1.2.2)
+    thor (1.3.1)
     tilt (2.0.11)
     timers (4.0.4)
       hitimes
diff --git a/middleman-cli/middleman-cli.gemspec b/middleman-cli/middleman-cli.gemspec
index 13a572082..b7d5e1d8d 100644
--- a/middleman-cli/middleman-cli.gemspec
+++ b/middleman-cli/middleman-cli.gemspec
@@ -20,5 +20,5 @@ Gem::Specification.new do |s|
   s.required_ruby_version = '>= 2.5.0'
 
   # CLI
-  s.add_dependency('thor', ['>= 0.17.0', '< 1.3.0'])
+  s.add_dependency('thor', '>= 0.17.0', '< 1.4.0')
 end