diff --git a/README.md b/README.md
index 330d1f9a5b5009848160551a06101a8ab63db819..ff0588e1f6561faec299f3d545434a50e3c5cf48 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ into a single extension.
 
 Inspired by [this StackOverflow discussion](https://stackoverflow.com/questions/30157363/collapse-multiple-submodules-to-one-cython-extension).
 
-Tested and works on Python 3.8 and Python 3.7, 
+Tested and works on CPython 3.8 and CPython 3.7, 
 both Windows and Linux.
 
 Usage
diff --git a/setup.cfg b/setup.cfg
index 07d2c715539853c17019f39abfd871f310245a7e..1f5aaef076cf0ff57ed8ec8727dc9ae6d92d7606 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -16,7 +16,6 @@ classifier =
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: Implementation :: CPython
-    Programming Language :: Python :: Implementation :: PyPy
     Operating System :: POSIX
     Operating System :: OS Independent
     Development Status :: 5 - Production/Stable