diff --git a/libs/xfce/Dockerfile b/libs/xfce/Dockerfile
index 15dd8dc9..550e3f81 100644
--- a/libs/xfce/Dockerfile
+++ b/libs/xfce/Dockerfile
@@ -123,8 +123,20 @@ RUN mkdir -p /home/cua/.cache && \
 # Install computer-server using Python 3.12 pip
 RUN python3.12 -m pip install cua-computer-server
 
-# Install PyQt6 and pywebview, used by cua-bench for web UIs
-RUN python3.12 -m pip install "pywebview[pyside6]"
+# Install GTK and WebKit dependencies for pywebview
+RUN apt-get update && apt-get install -y \
+    python3-gi \
+    python3-gi-cairo \
+    gir1.2-gtk-3.0 \
+    gir1.2-webkit2-4.1 \
+    libgirepository1.0-dev \
+    libcairo2-dev \
+    pkg-config \
+    gobject-introspection \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install pywebview with GTK backend, used by cua-bench for web UIs
+RUN python3.12 -m pip install "pywebview[gtk]"
 RUN python3.12 -m pip install cua-bench-ui>=0.7.0 --no-cache-dir
 
 # Install playwright and Firefox dependencies
diff --git a/libs/xfce/Dockerfile.dev b/libs/xfce/Dockerfile.dev
index f1dd7f02..f827c777 100644
--- a/libs/xfce/Dockerfile.dev
+++ b/libs/xfce/Dockerfile.dev
@@ -124,8 +124,20 @@ COPY python/computer-server /tmp/computer-server
 RUN python3.12 -m pip install /tmp/computer-server && \
     rm -rf /tmp/computer-server
 
-# Install PyQt6 and pywebview, used by cua-bench for web UIs
-RUN python3.12 -m pip install "pywebview[pyside6]"
+# Install GTK and WebKit dependencies for pywebview
+RUN apt-get update && apt-get install -y \
+    python3-gi \
+    python3-gi-cairo \
+    gir1.2-gtk-3.0 \
+    gir1.2-webkit2-4.1 \
+    libgirepository1.0-dev \
+    libcairo2-dev \
+    pkg-config \
+    gobject-introspection \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install pywebview with GTK backend, used by cua-bench for web UIs
+RUN python3.12 -m pip install "pywebview[gtk]"
 RUN python3.12 -m pip install cua-bench-ui>=0.7.0 --no-cache-dir
 
 # Install playwright and Firefox dependencies