diff --git a/Gemfile.lock b/Gemfile.lock
index f99c71c..9d89d6b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,7 +3,7 @@ PATH
   specs:
     dagger_ruby (0.11.1)
       base64 (~> 0.3)
-      json (~> 2.21)
+      json (>= 2.21, < 4.0)
       logger (~> 1.7)
 
 GEM
@@ -24,7 +24,7 @@ GEM
       rexml
     drb (2.2.3)
     hashdiff (1.2.1)
-    json (2.21.2)
+    json (3.0.2)
     language_server-protocol (3.17.0.6)
     lint_roller (1.1.0)
     logger (1.7.0)
diff --git a/dagger_ruby.gemspec b/dagger_ruby.gemspec
index 013f583..d4ba291 100644
--- a/dagger_ruby.gemspec
+++ b/dagger_ruby.gemspec
@@ -38,7 +38,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "base64", "~> 0.3"
-  spec.add_dependency "json", "~> 2.21"
+  spec.add_dependency "json", ">= 2.21", "< 4.0"
   spec.add_dependency "logger", "~> 1.7"
 
   # Development dependencies are managed in Gemfile