diff --git a/.containerversion b/.containerversion
index d81cc0710..920a13966 100644
--- a/.containerversion
+++ b/.containerversion
@@ -1 +1 @@
-42
+43
diff --git a/Dockerfile b/Dockerfile
index 7a69124fd..1269ee2e3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -117,9 +117,6 @@ RUN if [ "${TARGETPLATFORM}" = "linux/arm64" ]; then \
     rm /tmp/protoc-21.2.zip
 ENV PATH /opt/protoc/bin:$PATH
 
-# Make Python3 the default
-RUN update-alternatives --install /usr/bin/python python /usr/bin/python3 1
-
 # Developer tools
 RUN apt-get update && apt-get install -y \
     bash-completion
diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
index f2d3cfa88..178b4927c 100644
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@@ -52,6 +52,7 @@ ExternalProject_Add(libwally-core
   COMMAND         ${CMAKE_COMMAND} -E env
                   "CFLAGS=${LIBWALLY_CFLAGS}"
                   "LDFLAGS=${LIBWALLY_LDFLAGS}"
+                  PYTHON_VERSION=3
                   ${CMAKE_CURRENT_SOURCE_DIR}/libwally-core/configure
                   ${CONFIGURE_FLAGS}
                   ${LIBWALLY_CONFIGURE_FLAGS}
diff --git a/scripts/expand_template b/scripts/expand_template
index ec17524a7..e8fb133b0 100755
--- a/scripts/expand_template
+++ b/scripts/expand_template
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """Expand python templates"""
 
 from string import Template
diff --git a/scripts/get_version b/scripts/get_version
index fe8b88975..a407eb0e6 100755
--- a/scripts/get_version
+++ b/scripts/get_version
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 """
 Parse the tags and strip the prefix
 First argument should be prefix to match against