diff --git a/prawn.gemspec b/prawn.gemspec
index 6bb1261..e17091f 100644
--- a/prawn.gemspec
+++ b/prawn.gemspec
@@ -27,7 +27,7 @@ Gem::Specification.new do |s|
 
     if Gem::Version.new(Gem::VERSION) >= Gem::Version.new('1.2.0') then
       s.add_runtime_dependency(%q<pdf-reader>, ["< 2.0", ">= 0.9.0"])
-      s.add_runtime_dependency(%q<ttfunk>, ["~> 1.0.3"])
+      s.add_runtime_dependency(%q<ttfunk>, ["< 1.2", ">= 1.0.3"])
       s.add_runtime_dependency(%q<ruby-rc4>, [">= 0"])
       s.add_runtime_dependency(%q<afm>, [">= 0"])
       s.add_development_dependency(%q<pdf-inspector>, ["~> 1.0.1"])
@@ -35,7 +35,7 @@ Gem::Specification.new do |s|
       s.add_development_dependency(%q<rdoc>, [">= 0"])
     else
       s.add_dependency(%q<pdf-reader>, ["< 2.0", ">= 0.9.0"])
-      s.add_dependency(%q<ttfunk>, ["~> 1.0.3"])
+      s.add_dependency(%q<ttfunk>, ["< 1.2", ">= 1.0.3"])
       s.add_dependency(%q<ruby-rc4>, [">= 0"])
       s.add_dependency(%q<afm>, [">= 0"])
       s.add_dependency(%q<pdf-inspector>, ["~> 1.0.1"])
@@ -44,7 +44,7 @@ Gem::Specification.new do |s|
     end
   else
     s.add_dependency(%q<pdf-reader>, ["< 2.0", ">= 0.9.0"])
-    s.add_dependency(%q<ttfunk>, ["~> 1.0.3"])
+    s.add_dependency(%q<ttfunk>, ["< 1.2", ">= 1.0.3"])
     s.add_dependency(%q<ruby-rc4>, [">= 0"])
     s.add_dependency(%q<afm>, [">= 0"])
     s.add_dependency(%q<pdf-inspector>, ["~> 1.0.1"])