diff --git a/science/robotics/opencv/actions.py b/science/robotics/opencv/actions.py
index 8236990664..5049feffa1 100644
--- a/science/robotics/opencv/actions.py
+++ b/science/robotics/opencv/actions.py
@@ -72,7 +72,7 @@ def setup():
 def build():
     shelltools.cd("build")
     #cmaketools.make()
-    shelltools.system("ninja -j2")
+    shelltools.system("ninja")
 
 def install():
     shelltools.cd("build")
diff --git a/science/robotics/opencv/pspec.xml b/science/robotics/opencv/pspec.xml
index c6832203bf..a01d92f091 100644
--- a/science/robotics/opencv/pspec.xml
+++ b/science/robotics/opencv/pspec.xml
@@ -12,8 +12,8 @@
         <IsA>library</IsA>
         <Summary>Computer vision library</Summary>
         <Description>opencv is a programming library mainly aimed at the real time computer vision. Example applications are human-computer interaction, object identification, face recognition, motion tracking, mobile robotics.</Description>
-        <Archive sha1sum="71b8139c13b44438633f9ae8f12e58c43b0f76bf" type="targz" name="opencv-4.8.1.tar.gz">https://github.com/opencv/opencv/archive/refs/tags/4.8.1.tar.gz</Archive>
-        <Archive sha1sum="111cca75f8f3dd7d840755d6fc3c488c2fe980ed" type="targz" target="opencv-4.8.1" name="opencv_contrib-4.8.1.tar.gz">https://github.com/opencv/opencv_contrib/archive/refs/tags/4.8.1.tar.gz</Archive>
+        <Archive sha1sum="dda4c8f904f54733133b0d3df7058b304721c8a3" type="targz" name="opencv-4.12.0.tar.gz">https://github.com/opencv/opencv/archive/refs/tags/4.12.0.tar.gz</Archive>
+        <Archive sha1sum="2bcf20557c5019119c2307cb879e47b09bd1a4e5" type="targz" target="opencv-4.12.0" name="opencv_contrib-4.12.0.tar.gz">https://github.com/opencv/opencv_contrib/archive/refs/tags/4.12.0.tar.gz</Archive>
         <BuildDependencies>
             <Dependency>cmake</Dependency>
             <Dependency>hdf5-devel</Dependency>
@@ -119,6 +119,13 @@
     </Package>
 
     <History>
+        <Update release="19">
+            <Date>2025-07-20</Date>
+            <Version>4.12.0</Version>
+            <Comment>Version bump.</Comment>
+            <Name>Pisi Linux Community</Name>
+            <Email>admin@pisilinux.org</Email>
+        </Update>
         <Update release="18">
             <Date>2023-10-22</Date>
             <Version>4.8.1</Version>