diff --git a/cachecontrol/adapter.py b/cachecontrol/adapter.py
index 4f4c185..3f9386c 100644
--- a/cachecontrol/adapter.py
+++ b/cachecontrol/adapter.py
@@ -24,7 +24,7 @@
 
 
 class CacheControlAdapter(HTTPAdapter):
-    invalidating_methods = {"PUT", "PATCH", "DELETE"}
+    invalidating_methods = {"POST", "PUT", "PATCH", "DELETE"}
 
     def __init__(
         self,
diff --git a/tests/test_adapter.py b/tests/test_adapter.py
index 8a4f38e..cb4e754 100644
--- a/tests/test_adapter.py
+++ b/tests/test_adapter.py
@@ -62,6 +62,11 @@ def test_delete_invalidates_cache(self, url, sess):
         sess.get(url)
         assert not r2.from_cache
 
+    def test_post_invalidates_cache(self, url, sess):
+        sess.get(url)
+        sess.post(url, data={"foo": "bar"})
+        assert not sess.get(url).from_cache
+
     def test_close(self):
         cache = mock.Mock(spec=DictCache)
         sess = Session()