diff --git a/assets/release/Dockerfiles/Dockerfile.amd64.centos8 b/assets/release/Dockerfiles/Dockerfile.amd64.centos8
index 7ecb451e8..9f374b4dc 100644
--- a/assets/release/Dockerfiles/Dockerfile.amd64.centos8
+++ b/assets/release/Dockerfiles/Dockerfile.amd64.centos8
@@ -13,7 +13,7 @@ RUN sed -i 's/mirrorlist/#mirrorlist/g' /etc/yum.repos.d/CentOS-Linux-* && \
         libstdc++-devel \
         libatomic \
         perl \
-        python3 \
+        python39 \
         git \
         glib2-devel
 
diff --git a/assets/release/Dockerfiles/Dockerfile.amd64.ubuntu-18.04 b/assets/release/Dockerfiles/Dockerfile.amd64.ubuntu-18.04
index bfe8bb2f7..1d4cd01c4 100644
--- a/assets/release/Dockerfiles/Dockerfile.amd64.ubuntu-18.04
+++ b/assets/release/Dockerfiles/Dockerfile.amd64.ubuntu-18.04
@@ -26,6 +26,13 @@ RUN apt-get install -y --no-install-recommends \
         pip3 install scikit-build && \
         pip3 install cmake
 
+# Install Python 3.8 (required by V8's GN build system)
+RUN apt-get install -y software-properties-common && \
+    add-apt-repository -y ppa:deadsnakes/ppa && \
+    apt-get update && \
+    apt-get install -y python3.8 && \
+    alias python3=python3.8
+
 ENV RUSTUP_HOME=/usr/local/rustup CARGO_HOME=/usr/local/cargo
 ENV PATH $CARGO_HOME/bin:$PATH
 RUN mkdir -p "$CARGO_HOME" && mkdir -p "$RUSTUP_HOME" && \