diff --git a/ch03/requirements.txt b/ch03/requirements.txt
index 4476e5b..684c5b4 100644
--- a/ch03/requirements.txt
+++ b/ch03/requirements.txt
@@ -2,4 +2,4 @@ keras==2.1.6
 tensorflow==1.8.0
 h5py==2.7.1
 Pillow==4.3.0
-opencv-python==3.3.1.11
+opencv-python==4.2.0.32
diff --git a/ch03/requirements_gpu.txt b/ch03/requirements_gpu.txt
index 9eb1fae..4844560 100644
--- a/ch03/requirements_gpu.txt
+++ b/ch03/requirements_gpu.txt
@@ -2,4 +2,4 @@ keras==2.1.6
 tensorflow-gpu==1.8.0
 h5py==2.7.1
 Pillow==4.3.0
-opencv-python==3.3.1.11
+opencv-python==4.2.0.32