diff --git a/hvsrpy/meta.py b/hvsrpy/meta.py
index 67632de..2c7404e 100644
--- a/hvsrpy/meta.py
+++ b/hvsrpy/meta.py
@@ -17,4 +17,4 @@
 
 """Metadata for hvsrpy."""
 
-__version__ = "1.0.0rc0"
+__version__ = "1.0.0"
diff --git a/requirements.txt b/requirements.txt
index 77869ff..42e53f4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-numpy
+numpy<=1.20
 scipy
 obspy
 sigpropy>=1.0.0
diff --git a/setup.py b/setup.py
index ed37af3..5b1af44 100644
--- a/setup.py
+++ b/setup.py
@@ -47,7 +47,7 @@ def parse_meta(path_to_meta):
     keywords='horizontal-to-vertical spectral ratio hv hvsr',
     packages=find_packages(),
     python_requires='>=3.6',
-    install_requires=['numpy', 'scipy', 'obspy', 'sigpropy>=1.0.0',
+    install_requires=['numpy<=1.20', 'scipy', 'obspy', 'sigpropy>=1.0.0',
                       'pandas', 'shapely', 'termcolor', 'matplotlib', 'click>8.0.0'],
     extras_require={
         'dev': ['coverage', 'sphinx-click'],
diff --git a/test/data/output/example_output_geopsy.hv b/test/data/output/example_output_geopsy.hv
index b57d90a..dadb17f 100644
--- a/test/data/output/example_output_geopsy.hv
+++ b/test/data/output/example_output_geopsy.hv
@@ -1,4 +1,4 @@
-# hvsrpy output version 1.0.0rc0
+# hvsrpy output version 1.0.0
 # Number of windows = 46
 # f0 from average	0.7651
 # Number of windows for f0 = 46
diff --git a/test/data/output/example_output_hvsrpy.hv b/test/data/output/example_output_hvsrpy.hv
index 17415b9..26df7b1 100644
--- a/test/data/output/example_output_hvsrpy.hv
+++ b/test/data/output/example_output_hvsrpy.hv
@@ -1,4 +1,4 @@
-# hvsrpy output version 1.0.0rc0
+# hvsrpy output version 1.0.0
 # File Name (),UT.STN11.A2_C150.miniseed
 # Method (),geometric-mean
 # Azimuth (),None
diff --git a/test/data/output/example_output_hvsrpy_az.hv b/test/data/output/example_output_hvsrpy_az.hv
index 7353751..8324d6e 100644
--- a/test/data/output/example_output_hvsrpy_az.hv
+++ b/test/data/output/example_output_hvsrpy_az.hv
@@ -1,4 +1,4 @@
-# hvsrpy output version 1.0.0rc0
+# hvsrpy output version 1.0.0
 # File Name (),UT.STN11.A2_C150.miniseed
 # Window Length (s),60.0
 # Total Number of Windows per Azimuth (),60