diff --git a/setup.py b/setup.py
index 98bbc5d..371d6cd 100644
--- a/setup.py
+++ b/setup.py
@@ -24,7 +24,7 @@ requires = [
     "tabulate>=0.8.9",
 ]
 
-base_requires = ["ghostscript>=0.7", "opencv-python>=3.4.2.17", "pdftopng>=0.1.1"]
+base_requires = ["ghostscript>=0.7", "opencv-python>=3.4.2.17", "pdftopng>=0.2.3"]
 
 plot_requires = [
     "matplotlib>=2.2.3",