diff --git a/README.md b/README.md
index 1f291af..f2a1e7b 100644
--- a/README.md
+++ b/README.md
@@ -60,41 +60,44 @@ A collection of the official weather icons used by Google.
 [<img src="v2/tornado.png" width="64"/>](v2/tornado.png)
 
 ## v3
+In progress...
+
+## v4
 ### Day
-[<img src="v3/clear_day.svg" width="64"/>](v3/clear_day.svg)
-[<img src="v3/mostly_clear_day.svg" width="64"/>](v3/mostly_clear_day.svg)
-[<img src="v3/partly_cloudy_day.svg" width="64"/>](v3/partly_cloudy_day.svg)
-[<img src="v3/mostly_cloudy_day.svg" width="64"/>](v3/mostly_cloudy_day.svg)
-[<img src="v3/scattered_snow_showers_day.svg" width="64"/>](v3/scattered_snow_showers_day.svg)
-[<img src="v3/scattered_showers_day.svg" width="64"/>](v3/scattered_showers_day.svg)
-[<img src="v3/isolated_scattered_thunderstorms_day.svg" width="64"/>](v3/isolated_scattered_thunderstorms_day.svg)
-[<img src="v3/very_hot.svg" width="64"/>](v3/very_hot.svg)
+[<img src="v4/clear_day.svg" width="64"/>](v4/clear_day.svg)
+[<img src="v4/mostly_clear_day.svg" width="64"/>](v4/mostly_clear_day.svg)
+[<img src="v4/partly_cloudy_day.svg" width="64"/>](v4/partly_cloudy_day.svg)
+[<img src="v4/mostly_cloudy_day.svg" width="64"/>](v4/mostly_cloudy_day.svg)
+[<img src="v4/scattered_snow_showers_day.svg" width="64"/>](v4/scattered_snow_showers_day.svg)
+[<img src="v4/scattered_showers_day.svg" width="64"/>](v4/scattered_showers_day.svg)
+[<img src="v4/isolated_scattered_thunderstorms_day.svg" width="64"/>](v4/isolated_scattered_thunderstorms_day.svg)
+[<img src="v4/very_hot.svg" width="64"/>](v4/very_hot.svg)
 ### Night
-[<img src="v3/clear_night.svg" width="64"/>](v3/clear_night.svg)
-[<img src="v3/mostly_clear_night.svg" width="64"/>](v3/mostly_clear_night.svg)
-[<img src="v3/partly_cloudy_night.svg" width="64"/>](v3/partly_cloudy_night.svg)
-[<img src="v3/mostly_cloudy_night.svg" width="64"/>](v3/mostly_cloudy_night.svg)
-[<img src="v3/scattered_snow_showers_night.svg" width="64"/>](v3/scattered_snow_showers_night.svg)
-[<img src="v3/scattered_showers_night.svg" width="64"/>](v3/scattered_showers_night.svg)
-[<img src="v3/isolated_scattered_thunderstorms_night.svg" width="64"/>](v3/isolated_scattered_thunderstorms_night.svg)
+[<img src="v4/clear_night.svg" width="64"/>](v4/clear_night.svg)
+[<img src="v4/mostly_clear_night.svg" width="64"/>](v4/mostly_clear_night.svg)
+[<img src="v4/partly_cloudy_night.svg" width="64"/>](v4/partly_cloudy_night.svg)
+[<img src="v4/mostly_cloudy_night.svg" width="64"/>](v4/mostly_cloudy_night.svg)
+[<img src="v4/scattered_snow_showers_night.svg" width="64"/>](v4/scattered_snow_showers_night.svg)
+[<img src="v4/scattered_showers_night.svg" width="64"/>](v4/scattered_showers_night.svg)
+[<img src="v4/isolated_scattered_thunderstorms_night.svg" width="64"/>](v4/isolated_scattered_thunderstorms_night.svg)
 ### General
-[<img src="v3/cloudy.svg" width="64"/>](v3/cloudy.svg)
-[<img src="v3/drizzle.svg" width="64"/>](v3/drizzle.svg)
-[<img src="v3/showers_rain.svg" width="64"/>](v3/showers_rain.svg)
-[<img src="v3/heavy_rain.svg" width="64"/>](v3/heavy_rain.svg)
-[<img src="v3/flurries.svg" width="64"/>](v3/flurries.svg)
-[<img src="v3/showers_snow.svg" width="64"/>](v3/showers_snow.svg)
-[<img src="v3/heavy_snow.svg" width="64"/>](v3/heavy_snow.svg)
-[<img src="v3/mixed_rain_snow.svg" width="64"/>](v3/mixed_rain_snow.svg)
-[<img src="v3/mixed_rain_hail_sleet.svg" width="64"/>](v3/mixed_rain_hail_sleet.svg)
-[<img src="v3/sleet_hail.svg" width="64"/>](v3/sleet_hail.svg)
-[<img src="v3/strong_thunderstorms.svg" width="64"/>](v3/strong_thunderstorms.svg)
-[<img src="v3/isolated_thunderstorms.svg" width="64"/>](v3/isolated_thunderstorms.svg)
-[<img src="v3/icy.svg" width="64"/>](v3/icy.svg)
-[<img src="v3/tropical_storm_hurricane.svg" width="64"/>](v3/tropical_storm_hurricane.svg)
-[<img src="v3/haze_fog_dust_smoke.svg" width="64"/>](v3/haze_fog_dust_smoke.svg)
-[<img src="v3/windy.svg" width="64"/>](v3/windy.svg)
-[<img src="v3/blowing_snow.svg" width="64"/>](v3/blowing_snow.svg)
-[<img src="v3/blizzard.svg" alt="drawing" width="64"/>](v3/blizzard.svg)
-[<img src="v3/tornado.svg" width="64"/>](v3/tornado.svg)
-[<img src="v3/very_cold.svg" width="64"/>](v3/very_cold.svg)
+[<img src="v4/cloudy.svg" width="64"/>](v4/cloudy.svg)
+[<img src="v4/drizzle.svg" width="64"/>](v4/drizzle.svg)
+[<img src="v4/showers_rain.svg" width="64"/>](v4/showers_rain.svg)
+[<img src="v4/heavy_rain.svg" width="64"/>](v4/heavy_rain.svg)
+[<img src="v4/flurries.svg" width="64"/>](v4/flurries.svg)
+[<img src="v4/showers_snow.svg" width="64"/>](v4/showers_snow.svg)
+[<img src="v4/heavy_snow.svg" width="64"/>](v4/heavy_snow.svg)
+[<img src="v4/mixed_rain_snow.svg" width="64"/>](v4/mixed_rain_snow.svg)
+[<img src="v4/mixed_rain_hail_sleet.svg" width="64"/>](v4/mixed_rain_hail_sleet.svg)
+[<img src="v4/sleet_hail.svg" width="64"/>](v4/sleet_hail.svg)
+[<img src="v4/strong_thunderstorms.svg" width="64"/>](v4/strong_thunderstorms.svg)
+[<img src="v4/isolated_thunderstorms.svg" width="64"/>](v4/isolated_thunderstorms.svg)
+[<img src="v4/icy.svg" width="64"/>](v4/icy.svg)
+[<img src="v4/tropical_storm_hurricane.svg" width="64"/>](v4/tropical_storm_hurricane.svg)
+[<img src="v4/haze_fog_dust_smoke.svg" width="64"/>](v4/haze_fog_dust_smoke.svg)
+[<img src="v4/windy.svg" width="64"/>](v4/windy.svg)
+[<img src="v4/blowing_snow.svg" width="64"/>](v4/blowing_snow.svg)
+[<img src="v4/blizzard.svg" alt="drawing" width="64"/>](v4/blizzard.svg)
+[<img src="v4/tornado.svg" width="64"/>](v4/tornado.svg)
+[<img src="v4/very_cold.svg" width="64"/>](v4/very_cold.svg)
diff --git a/v3/blizzard.svg b/v4/blizzard.svg
similarity index 100%
rename from v3/blizzard.svg
rename to v4/blizzard.svg
diff --git a/v3/blowing_snow.svg b/v4/blowing_snow.svg
similarity index 100%
rename from v3/blowing_snow.svg
rename to v4/blowing_snow.svg
diff --git a/v3/clear_day.svg b/v4/clear_day.svg
similarity index 100%
rename from v3/clear_day.svg
rename to v4/clear_day.svg
diff --git a/v3/clear_night.svg b/v4/clear_night.svg
similarity index 100%
rename from v3/clear_night.svg
rename to v4/clear_night.svg
diff --git a/v3/cloudy.svg b/v4/cloudy.svg
similarity index 100%
rename from v3/cloudy.svg
rename to v4/cloudy.svg
diff --git a/v3/drizzle.svg b/v4/drizzle.svg
similarity index 100%
rename from v3/drizzle.svg
rename to v4/drizzle.svg
diff --git a/v3/flurries.svg b/v4/flurries.svg
similarity index 100%
rename from v3/flurries.svg
rename to v4/flurries.svg
diff --git a/v3/haze_fog_dust_smoke.svg b/v4/haze_fog_dust_smoke.svg
similarity index 100%
rename from v3/haze_fog_dust_smoke.svg
rename to v4/haze_fog_dust_smoke.svg
diff --git a/v3/heavy_rain.svg b/v4/heavy_rain.svg
similarity index 100%
rename from v3/heavy_rain.svg
rename to v4/heavy_rain.svg
diff --git a/v3/heavy_snow.svg b/v4/heavy_snow.svg
similarity index 100%
rename from v3/heavy_snow.svg
rename to v4/heavy_snow.svg
diff --git a/v3/icy.svg b/v4/icy.svg
similarity index 100%
rename from v3/icy.svg
rename to v4/icy.svg
diff --git a/v3/isolated_scattered_thunderstorms_day.svg b/v4/isolated_scattered_thunderstorms_day.svg
similarity index 100%
rename from v3/isolated_scattered_thunderstorms_day.svg
rename to v4/isolated_scattered_thunderstorms_day.svg
diff --git a/v3/isolated_scattered_thunderstorms_night.svg b/v4/isolated_scattered_thunderstorms_night.svg
similarity index 100%
rename from v3/isolated_scattered_thunderstorms_night.svg
rename to v4/isolated_scattered_thunderstorms_night.svg
diff --git a/v3/isolated_thunderstorms.svg b/v4/isolated_thunderstorms.svg
similarity index 100%
rename from v3/isolated_thunderstorms.svg
rename to v4/isolated_thunderstorms.svg
diff --git a/v3/mixed_rain_hail_sleet.svg b/v4/mixed_rain_hail_sleet.svg
similarity index 100%
rename from v3/mixed_rain_hail_sleet.svg
rename to v4/mixed_rain_hail_sleet.svg
diff --git a/v3/mixed_rain_snow.svg b/v4/mixed_rain_snow.svg
similarity index 100%
rename from v3/mixed_rain_snow.svg
rename to v4/mixed_rain_snow.svg
diff --git a/v3/mostly_clear_day.svg b/v4/mostly_clear_day.svg
similarity index 100%
rename from v3/mostly_clear_day.svg
rename to v4/mostly_clear_day.svg
diff --git a/v3/mostly_clear_night.svg b/v4/mostly_clear_night.svg
similarity index 100%
rename from v3/mostly_clear_night.svg
rename to v4/mostly_clear_night.svg
diff --git a/v3/mostly_cloudy_day.svg b/v4/mostly_cloudy_day.svg
similarity index 100%
rename from v3/mostly_cloudy_day.svg
rename to v4/mostly_cloudy_day.svg
diff --git a/v3/mostly_cloudy_night.svg b/v4/mostly_cloudy_night.svg
similarity index 100%
rename from v3/mostly_cloudy_night.svg
rename to v4/mostly_cloudy_night.svg
diff --git a/v3/partly_cloudy_day.svg b/v4/partly_cloudy_day.svg
similarity index 100%
rename from v3/partly_cloudy_day.svg
rename to v4/partly_cloudy_day.svg
diff --git a/v3/partly_cloudy_night.svg b/v4/partly_cloudy_night.svg
similarity index 100%
rename from v3/partly_cloudy_night.svg
rename to v4/partly_cloudy_night.svg
diff --git a/v3/scattered_showers_day.svg b/v4/scattered_showers_day.svg
similarity index 100%
rename from v3/scattered_showers_day.svg
rename to v4/scattered_showers_day.svg
diff --git a/v3/scattered_showers_night.svg b/v4/scattered_showers_night.svg
similarity index 100%
rename from v3/scattered_showers_night.svg
rename to v4/scattered_showers_night.svg
diff --git a/v3/scattered_snow_showers_day.svg b/v4/scattered_snow_showers_day.svg
similarity index 100%
rename from v3/scattered_snow_showers_day.svg
rename to v4/scattered_snow_showers_day.svg
diff --git a/v3/scattered_snow_showers_night.svg b/v4/scattered_snow_showers_night.svg
similarity index 100%
rename from v3/scattered_snow_showers_night.svg
rename to v4/scattered_snow_showers_night.svg
diff --git a/v3/showers_rain.svg b/v4/showers_rain.svg
similarity index 100%
rename from v3/showers_rain.svg
rename to v4/showers_rain.svg
diff --git a/v3/showers_snow.svg b/v4/showers_snow.svg
similarity index 100%
rename from v3/showers_snow.svg
rename to v4/showers_snow.svg
diff --git a/v3/sleet_hail.svg b/v4/sleet_hail.svg
similarity index 100%
rename from v3/sleet_hail.svg
rename to v4/sleet_hail.svg
diff --git a/v3/strong_thunderstorms.svg b/v4/strong_thunderstorms.svg
similarity index 100%
rename from v3/strong_thunderstorms.svg
rename to v4/strong_thunderstorms.svg
diff --git a/v3/tornado.svg b/v4/tornado.svg
similarity index 100%
rename from v3/tornado.svg
rename to v4/tornado.svg
diff --git a/v3/tropical_storm_hurricane.svg b/v4/tropical_storm_hurricane.svg
similarity index 100%
rename from v3/tropical_storm_hurricane.svg
rename to v4/tropical_storm_hurricane.svg
diff --git a/v3/very_cold.svg b/v4/very_cold.svg
similarity index 100%
rename from v3/very_cold.svg
rename to v4/very_cold.svg
diff --git a/v3/very_hot.svg b/v4/very_hot.svg
similarity index 100%
rename from v3/very_hot.svg
rename to v4/very_hot.svg
diff --git a/v3/windy.svg b/v4/windy.svg
similarity index 100%
rename from v3/windy.svg
rename to v4/windy.svg