According to http://www.debian.org/doc/debian-policy/ch-relationships…

….html#s-depsyntax (= version) is valid and also that is sematically more correct than (>= version) and (<< version+1) because your +1 guess is just that, a guess.

lib/fpm/package/deb.rb

@@ -254,20 +254,7 @@ def fix_dependency(dep)
 
     # Convert gem ~> X.Y.Z to '>= X.Y.Z' and << X.Y+1.0
     if dep =~ /\(~>/
-      name, version = dep.gsub(/[()~>]/, "").split(/ +/)[0..1]
-      nextversion = version.split(".").collect { |v| v.to_i }
-      l = nextversion.length
-      nextversion[l-2] += 1
-      nextversion[l-1] = 0
-      nextversion = nextversion.join(".")
-      return ["#{name} (>= #{version})", "#{name} (<< #{nextversion})"]
-    elsif (m = dep.match(/(\S+)\s+\(= (.+)\)/))
-      # Convert 'foo (= x)' to 'foo (>= x)' and 'foo (<< x+1)'
-      name, version = m[1..2]
-      nextversion = version.split('.').collect { |v| v.to_i }
-      nextversion[-1] += 1
-      nextversion = nextversion.join(".")
-      return ["#{name} (>= #{version})", "#{name} (<< #{nextversion})"]
+      return "#{name} (= #{version})"
     else
       # otherwise the dep is probably fine
       return dep