diff --git a/README.md b/README.md
index 9ac78cd88d..b732272d8a 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,9 @@ Flightmare can be used for various applications, including path-planning, reinfo
 ## Installation
 Installation instructions can be found in our [Wiki](https://github.com/uzh-rpg/flightmare/wiki).
   
+## Updates
+ *  04.09.2020 Release Flightmare
+
 ## Publication
 
 If you use this code in a publication, please cite the following paper **[PDF](https://arxiv.org/abs/2009.00563)**
diff --git a/flightlib/setup.py b/flightlib/setup.py
index 7fa372eaf7..419cab6259 100644
--- a/flightlib/setup.py
+++ b/flightlib/setup.py
@@ -30,7 +30,19 @@ def run(self):
                 print("Removing some cache file: ", p)
         except:
             pass
+        FLIGHTLIB_BUILD_FILES = os.environ["FLIGHTMARE_PATH"] + \
+            "/flightlib/build/"
         # --------------------------------
+        # remove cached build files
+        # a hack to solve some cmake error when using "pip install ."
+        try:
+            for i, p in enumerate(glob.glob(os.path.join(FLIGHTLIB_EXTERNAL_FILES, "*"))):
+                shutil.rmtree(p)
+                print("Removing some cache file: ", p)
+        except:
+            pass
+        # --------------------------------
+
         try:
             out = subprocess.check_output(['cmake', '--version'])
         except OSError:
diff --git a/flightrl/examples/view_reward.py b/flightrl/examples/view_reward.py
index f77ce470cc..b5b4192802 100644
--- a/flightrl/examples/view_reward.py
+++ b/flightrl/examples/view_reward.py
@@ -18,7 +18,7 @@ def plot_reward(save_dir, varname, ylabel, save_fig=False):
 
 
 if __name__ == "__main__":
-    logger_dir = "./saved/2020-08-28-14-59-38/"
+    logger_dir = "./saved/2020-09-22-13-46-21/"
     ppo_var_names = ["ep_reward_mean", "ep_len_mean", "policy_entropy"]
     ppo_y_labels = ["Reward", "Episode Length", "Policy Entropy"]
     #
diff --git a/requirements.txt b/requirements.txt
index 352084b523..5cca70d19b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,2 @@
-tensorflow == 1.8.0
\ No newline at end of file
+tensorflow-gpu==1.8.0
+scikit-build