diff --git a/Gemfile.lock b/Gemfile.lock
index 0a86c296..c9e469c8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -17,10 +17,10 @@ GEM
     hirb (0.3.4)
     mysql (2.8.1)
     prawn (0.6.3)
-      prawn-core (< 0.7, >= 0.6.3)
-      prawn-format (< 0.3, >= 0.2.3)
-      prawn-layout (< 0.4, >= 0.3.2)
-      prawn-security (< 0.2, >= 0.1.1)
+      prawn-core (>= 0.6.3, < 0.7)
+      prawn-format (>= 0.2.3, < 0.3)
+      prawn-layout (>= 0.3.2, < 0.4)
+      prawn-security (>= 0.1.1, < 0.2)
     prawn-core (0.6.3)
     prawn-format (0.2.3)
       prawn-core