diff --git a/install.sh b/install.sh
index 4f2f259e64158737777cb45fb539d3e7cf578354..5ce4ec4da5cd69eda27282a15e79b60c1646cd32 100644
--- a/install.sh
+++ b/install.sh
@@ -1,2 +1,4 @@
-python setup.py develop
+conda install numpy==1.26.4
+conda install cython==3.0.6
+conda install mpi4py==3.1.6
 pip install -e .
diff --git a/setup.py b/setup.py
index bc274825d1afb045a9aef630bebf5722548eabba..d9abea14c19b5ebc0c923df69b8b409bd75732b4 100644
--- a/setup.py
+++ b/setup.py
@@ -53,10 +53,12 @@ setup(
     license_files="LICENSE",
     packages=["SpecDisperser", "SpecDisperser/disperse_c"],
     install_requires=[
-        # 'galsim',
+        'galsim',
         # 'numpy',
-        # 'scipy',
-        # 'astropy',
+        'scipy',
+        'astropy',
+        'matplotlib',
+        'photutils'
     ],
-    ext_modules=cythonize(extensions),
+    ext_modules=cythonize(extensions, language_level="3"),
 )