diff --git a/requirements.in b/requirements.in
index 4a95844a..08094354 100644
--- a/requirements.in
+++ b/requirements.in
@@ -1,6 +1,6 @@
-scipy>=0.17.0
-numpy>=1.16.1
+scipy
+numpy
 matplotlib>=1.3.1
-attrs==18.1.0
-tqdm==4.24.0
-future==0.16.0
+attrs
+tqdm
+future
diff --git a/requirements.txt b/requirements.txt
index 95d9296b..49c4942b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,4 +9,3 @@ python-dateutil==2.7.5
 scipy==1.2.0
 six==1.12.0
 tqdm==4.24.0
-pyyaml==3.13