diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index 6ad9b52d0..000000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,17 +0,0 @@
-version: 2.1
-
-jobs:
-#  build:
-#    docker:
-#      - image: cimg/base:stable
-#    steps:
-#      - checkout
-#      - run: echo "This job is configured but will never run because it's commented out."
-
-workflows:
-#  version: 2
-#  build_and_test:
-#    jobs:
-#      - build
-
-# This config file is a placeholder and does not define any active jobs or workflows.
diff --git a/16-master/Dockerfile b/16-master/Dockerfile
index 8f322d6a1..9001fb652 100644
--- a/16-master/Dockerfile
+++ b/16-master/Dockerfile
@@ -88,13 +88,12 @@ RUN set -ex \
 
 ARG DOCKER_CMAKE_BUILD_TYPE
 ENV DOCKER_CMAKE_BUILD_TYPE=${DOCKER_CMAKE_BUILD_TYPE}
+ENV NLOHMANN_JSON_VERSION=3.12.0
 
 # nlohmann/json - header-only library for SFCGAL (with CMake support)
 RUN set -ex \
     && mkdir -p /usr/src \
     && cd /usr/src \
-    # Get the latest release version dynamically
-    && NLOHMANN_JSON_VERSION=$(curl -s https://api.github.com/repos/nlohmann/json/releases/latest | grep '"tag_name":' | sed -E 's/.*"v([^"]+)".*/\1/') \
     && echo "Installing nlohmann/json version: ${NLOHMANN_JSON_VERSION}" \
     # Download and extract the full source with CMake support
     && curl -L "https://github.com/nlohmann/json/archive/refs/tags/v${NLOHMANN_JSON_VERSION}.tar.gz" -o nlohmann-json.tar.gz \
diff --git a/17-master/Dockerfile b/17-master/Dockerfile
index 185c8854b..549b5d28b 100644
--- a/17-master/Dockerfile
+++ b/17-master/Dockerfile
@@ -88,13 +88,12 @@ RUN set -ex \
 
 ARG DOCKER_CMAKE_BUILD_TYPE
 ENV DOCKER_CMAKE_BUILD_TYPE=${DOCKER_CMAKE_BUILD_TYPE}
+ENV NLOHMANN_JSON_VERSION=3.12.0
 
 # nlohmann/json - header-only library for SFCGAL (with CMake support)
 RUN set -ex \
     && mkdir -p /usr/src \
     && cd /usr/src \
-    # Get the latest release version dynamically
-    && NLOHMANN_JSON_VERSION=$(curl -s https://api.github.com/repos/nlohmann/json/releases/latest | grep '"tag_name":' | sed -E 's/.*"v([^"]+)".*/\1/') \
     && echo "Installing nlohmann/json version: ${NLOHMANN_JSON_VERSION}" \
     # Download and extract the full source with CMake support
     && curl -L "https://github.com/nlohmann/json/archive/refs/tags/v${NLOHMANN_JSON_VERSION}.tar.gz" -o nlohmann-json.tar.gz \
diff --git a/18-master/Dockerfile b/18-master/Dockerfile
index 4a41fb88a..02d810952 100644
--- a/18-master/Dockerfile
+++ b/18-master/Dockerfile
@@ -88,13 +88,12 @@ RUN set -ex \
 
 ARG DOCKER_CMAKE_BUILD_TYPE
 ENV DOCKER_CMAKE_BUILD_TYPE=${DOCKER_CMAKE_BUILD_TYPE}
+ENV NLOHMANN_JSON_VERSION=3.12.0
 
 # nlohmann/json - header-only library for SFCGAL (with CMake support)
 RUN set -ex \
     && mkdir -p /usr/src \
     && cd /usr/src \
-    # Get the latest release version dynamically
-    && NLOHMANN_JSON_VERSION=$(curl -s https://api.github.com/repos/nlohmann/json/releases/latest | grep '"tag_name":' | sed -E 's/.*"v([^"]+)".*/\1/') \
     && echo "Installing nlohmann/json version: ${NLOHMANN_JSON_VERSION}" \
     # Download and extract the full source with CMake support
     && curl -L "https://github.com/nlohmann/json/archive/refs/tags/v${NLOHMANN_JSON_VERSION}.tar.gz" -o nlohmann-json.tar.gz \
diff --git a/Dockerfile.master.template b/Dockerfile.master.template
index 6a8e64bcd..fa2b60a3a 100644
--- a/Dockerfile.master.template
+++ b/Dockerfile.master.template
@@ -88,13 +88,12 @@ RUN set -ex \
 
 ARG DOCKER_CMAKE_BUILD_TYPE
 ENV DOCKER_CMAKE_BUILD_TYPE=${DOCKER_CMAKE_BUILD_TYPE}
+ENV NLOHMANN_JSON_VERSION=3.12.0
 
 # nlohmann/json - header-only library for SFCGAL (with CMake support)
 RUN set -ex \
     && mkdir -p /usr/src \
     && cd /usr/src \
-    # Get the latest release version dynamically
-    && NLOHMANN_JSON_VERSION=$(curl -s https://api.github.com/repos/nlohmann/json/releases/latest | grep '"tag_name":' | sed -E 's/.*"v([^"]+)".*/\1/') \
     && echo "Installing nlohmann/json version: ${NLOHMANN_JSON_VERSION}" \
     # Download and extract the full source with CMake support
     && curl -L "https://github.com/nlohmann/json/archive/refs/tags/v${NLOHMANN_JSON_VERSION}.tar.gz" -o nlohmann-json.tar.gz \