diff --git a/homeassistant/components/forecast_solar/manifest.json b/homeassistant/components/forecast_solar/manifest.json
index f5dd79281e6..6f34d791857 100644
--- a/homeassistant/components/forecast_solar/manifest.json
+++ b/homeassistant/components/forecast_solar/manifest.json
@@ -7,5 +7,5 @@
   "integration_type": "service",
   "iot_class": "cloud_polling",
   "quality_scale": "platinum",
-  "requirements": ["forecast-solar==3.1.0"]
+  "requirements": ["forecast-solar==4.0.0"]
 }
diff --git a/requirements_all.txt b/requirements_all.txt
index fe4786562b6..14d350fcfbc 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -931,7 +931,7 @@ fnv-hash-fast==1.0.2
 foobot_async==1.0.0
 
 # homeassistant.components.forecast_solar
-forecast-solar==3.1.0
+forecast-solar==4.0.0
 
 # homeassistant.components.fortios
 fortiosapi==1.0.5
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index 063eedd7a95..ab925cdb883 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -790,7 +790,7 @@ fnv-hash-fast==1.0.2
 foobot_async==1.0.0
 
 # homeassistant.components.forecast_solar
-forecast-solar==3.1.0
+forecast-solar==4.0.0
 
 # homeassistant.components.freebox
 freebox-api==1.1.0