Found potential issue

.github/workflows/python-app.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Python setup #removed conda setup
         uses: actions/setup-python@v4
         with:
-          python-version: 3.9
+          python-version: 3.7
       - name: Installing dependencies
         run: pip install -e .[harl]
       - name: Test human_aware_rl with unittest

.github/workflows/pythonlint.yml

@@ -8,10 +8,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - name: Set up Python 3.9
+    - name: Set up Python 3.7
       uses: actions/setup-python@v4
       with:
-        python-version: '3.9' 
+        python-version: '3.7' 
         architecture: 'x64'
     - name: Install dependencies
       run: |

.github/workflows/pythontests.yml

@@ -21,10 +21,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - name: Set up Python 3.9
+    - name: Set up Python 3.7
       uses: actions/setup-python@v4
       with:
-        python-version: '3.9'
+        python-version: '3.7'
         architecture: 'x64'
     - name: Install dependencies
       run: |

setup.py

@@ -39,7 +39,7 @@
     },
     install_requires=[
         "dill",
-        "numpy==1.18",
+        "numpy",
         "scipy",
         "tqdm",
         "gym",