diff --git a/ext/bigdecimal/lib/bigdecimal/jacobian.rb b/ext/bigdecimal/lib/bigdecimal/jacobian.rb
index a416e06832..eb9b1c9fc5 100644
--- a/ext/bigdecimal/lib/bigdecimal/jacobian.rb
+++ b/ext/bigdecimal/lib/bigdecimal/jacobian.rb
@@ -51,7 +51,6 @@ module Jacobian
     dx = fx[i].abs/ratio if isEqual(dx,f.zero,f.zero,f.eps)
     dx = f.one/f.ten     if isEqual(dx,f.zero,f.zero,f.eps)
     until ok>0 do
-      s = f.zero
       deriv = []
       nRetry += 1
       if nRetry > 100
diff --git a/ext/bigdecimal/lib/bigdecimal/math.rb b/ext/bigdecimal/lib/bigdecimal/math.rb
index 16cf9c8731..7289661fc2 100644
--- a/ext/bigdecimal/lib/bigdecimal/math.rb
+++ b/ext/bigdecimal/lib/bigdecimal/math.rb
@@ -159,7 +159,6 @@ module BigMath
 
     d = one
     k = one
-    w = one
     t = BigDecimal("-80")
     while d.nonzero? && ((m = n - (pi.exponent - d.exponent).abs) > 0)
       m = BigDecimal.double_fig if m < BigDecimal.double_fig
@@ -171,7 +170,6 @@ module BigMath
 
     d = one
     k = one
-    w = one
     t = BigDecimal("956")
     while d.nonzero? && ((m = n - (pi.exponent - d.exponent).abs) > 0)
       m = BigDecimal.double_fig if m < BigDecimal.double_fig
diff --git a/lib/cgi/core.rb b/lib/cgi/core.rb
index 27137a2032..323a6a5361 100644
--- a/lib/cgi/core.rb
+++ b/lib/cgi/core.rb
@@ -238,7 +238,7 @@ class CGI
         arr.each {|c| buf << "Set-Cookie: #{c}#{EOL}" }
       when Hash
         hash = cookie
-        hash.each {|name, c| buf << "Set-Cookie: #{c}#{EOL}" }
+        hash.each_value {|c| buf << "Set-Cookie: #{c}#{EOL}" }
       end
     end
     if @output_cookies