diff --git a/orbf-rules_engine.gemspec b/orbf-rules_engine.gemspec
index 3d9510d..9eb8711 100644
--- a/orbf-rules_engine.gemspec
+++ b/orbf-rules_engine.gemspec
@@ -34,7 +34,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "activesupport"
   spec.add_dependency "colorize"
   spec.add_dependency "hesabu"
-  spec.add_dependency "dentaku", "~> 3.3"
+  spec.add_dependency "dentaku", "3.1"
   spec.add_dependency "dhis2", "2.3.8"
   spec.add_dependency "descriptive_statistics"