diff --git a/libsass-build/ast.cpp b/libsass-build/ast.cpp
index e1eb078..0b6248d 100644
--- a/libsass-build/ast.cpp
+++ b/libsass-build/ast.cpp
@@ -2030,14 +2030,6 @@ namespace Sass {
     return to_string({ NESTED, 5 });
   }
 
-  // helper function for serializing colors
-  template <size_t range>
-  static double cap_channel(double c) {
-    if      (c > range) return range;
-    else if (c < 0)     return 0;
-    else                return c;
-  }
-
   std::string String_Quoted::inspect() const
   {
     return quote(value_, '*');
@@ -2064,4 +2056,3 @@ namespace Sass {
   }
 
 }
-
diff --git a/libsass-build/include/sass/version.h b/libsass-build/include/sass/version.h
index 4343c2d..24023b2 100644
--- a/libsass-build/include/sass/version.h
+++ b/libsass-build/include/sass/version.h
@@ -2,7 +2,7 @@
 #define SASS_VERSION_H
 
 #ifndef LIBSASS_VERSION
-#define LIBSASS_VERSION "3.3.3-4-g01e0d"
+#define LIBSASS_VERSION "3.3.3-5-g15b8"
 #endif
 
 #endif
diff --git a/libsass-src b/libsass-src
index 01e0d84..15b88d3 160000
--- a/libsass-src
+++ b/libsass-src
@@ -1 +1 @@
-Subproject commit 01e0d843a6c66f5231c2fcd013de23b1c92beaeb
+Subproject commit 15b88d31f12dfba660320eaf8a38764cebe88620