diff --git a/Gemfile.lock b/Gemfile.lock
index f9aff8c..8778f23 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,7 +4,7 @@ PATH
     tetra (2.0.6)
       clamp (~> 1.3.2)
       erb (~> 4.0.3)
-      json_pure (~> 2.6.3)
+      json_pure (>= 2.6.3, < 2.8.0)
       open4 (~> 1.3.4)
       rexml (~> 3.2.5)
       rubyzip (~> 2.3.2)
@@ -58,7 +58,7 @@ GEM
       cgi (>= 0.3.3)
     ffi (1.15.5)
     json (2.6.3)
-    json_pure (2.6.3)
+    json_pure (2.7.0)
     language_server-protocol (3.17.0.3)
     mime-types (3.4.1)
       mime-types-data (~> 3.2015)
diff --git a/tetra.gemspec b/tetra.gemspec
index beb51d0..e4b13a6 100644
--- a/tetra.gemspec
+++ b/tetra.gemspec
@@ -34,7 +34,7 @@ Gem::Specification.new do |s|
 
   s.add_runtime_dependency "clamp", "~> 1.3.2"
   s.add_runtime_dependency "erb", "~> 4.0.3"
-  s.add_runtime_dependency "json_pure", "~> 2.6.3"
+  s.add_runtime_dependency "json_pure", ">= 2.6.3", "< 2.8.0"
   s.add_runtime_dependency "open4", "~> 1.3.4"
   s.add_runtime_dependency "rexml", "~> 3.2.5"
   s.add_runtime_dependency "rubyzip", "~> 2.3.2"