diff --git a/.github/workflows/debian.yml b/.github/workflows/debian.yml
index 1185dfb..10dc192 100644
--- a/.github/workflows/debian.yml
+++ b/.github/workflows/debian.yml
@@ -9,7 +9,8 @@ on:
 env:
   CONTAINER_REGISTRY: ghcr.io
   BUILDKIT_PROGRESS: plain
-  CONAN_VERSION: 2.17.0
+  CONAN_VERSION: 2.18.0
+  GCOVR_VERSION: 8.3
   NONROOT_USER: ci
   FALLBACK_GCC: 12
   FALLBACK_CLANG: 16
@@ -98,9 +99,9 @@ jobs:
             BUILDKIT_DOCKERFILE_CHECK=skip=InvalidDefaultArgInFrom
             BUILDKIT_INLINE_CACHE=1
             CLANG_VERSION=${{ matrix.os.compiler_name == 'clang' && matrix.os.compiler_version || env.FALLBACK_CLANG }}
-            GCC_VERSION=${{ matrix.os.compiler_name == 'gcc' && matrix.os.compiler_version || env.FALLBACK_GCC }}
             CONAN_VERSION=${{ env.CONAN_VERSION }}
-            GITHUB_REPO=${{ github.repository }}
+            GCC_VERSION=${{ matrix.os.compiler_name == 'gcc' && matrix.os.compiler_version || env.FALLBACK_GCC }}
+            GCOVR_VERSION=${{ env.GCOVR_VERSION }}
             NONROOT_USER=${{ env.NONROOT_USER }}
             DEBIAN_VERSION=${{ matrix.os.release }}
           context: docker/debian
diff --git a/.github/workflows/rhel.yml b/.github/workflows/rhel.yml
index 98d4bc2..1d9e246 100644
--- a/.github/workflows/rhel.yml
+++ b/.github/workflows/rhel.yml
@@ -10,7 +10,8 @@ env:
   CONTAINER_REGISTRY: ghcr.io
   REDHAT_REGISTRY: registry.redhat.io
   BUILDKIT_PROGRESS: plain
-  CONAN_VERSION: 2.17.0
+  CONAN_VERSION: 2.18.0
+  GCOVR_VERSION: 8.3
   NONROOT_USER: ci
 
 jobs:
@@ -90,7 +91,7 @@ jobs:
             BUILDKIT_INLINE_CACHE=1
             CONAN_VERSION=${{ env.CONAN_VERSION }}
             GCC_VERSION=${{ matrix.os.compiler_version }}
-            GITHUB_REPO=${{ github.repository }}
+            GCOVR_VERSION=${{ env.GCOVR_VERSION }}
             NONROOT_USER=${{ env.NONROOT_USER }}
             RHEL_VERSION=${{ matrix.os.release }}
           context: docker/rhel
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index e41c865..cc5a868 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -9,7 +9,8 @@ on:
 env:
   CONTAINER_REGISTRY: ghcr.io
   BUILDKIT_PROGRESS: plain
-  CONAN_VERSION: 2.17.0
+  CONAN_VERSION: 2.18.0
+  GCOVR_VERSION: 8.3
   NONROOT_USER: ci
   FALLBACK_GCC: 12
   FALLBACK_CLANG: 16
@@ -96,9 +97,9 @@ jobs:
             BUILDKIT_DOCKERFILE_CHECK=skip=InvalidDefaultArgInFrom
             BUILDKIT_INLINE_CACHE=1
             CLANG_VERSION=${{ matrix.os.compiler_name == 'clang' && matrix.os.compiler_version || env.FALLBACK_CLANG }}
-            GCC_VERSION=${{ matrix.os.compiler_name == 'gcc' && matrix.os.compiler_version || env.FALLBACK_GCC }}
             CONAN_VERSION=${{ env.CONAN_VERSION }}
-            GITHUB_REPO=${{ github.repository }}
+            GCC_VERSION=${{ matrix.os.compiler_name == 'gcc' && matrix.os.compiler_version || env.FALLBACK_GCC }}
+            GCOVR_VERSION=${{ env.GCOVR_VERSION }}
             NONROOT_USER=${{ env.NONROOT_USER }}
             UBUNTU_VERSION=${{ matrix.os.release }}
           context: docker/ubuntu
diff --git a/docker/debian/Dockerfile b/docker/debian/Dockerfile
index aaa37d9..663a855 100644
--- a/docker/debian/Dockerfile
+++ b/docker/debian/Dockerfile
@@ -26,6 +26,8 @@ ln -fs /usr/share/zoneinfo/America/Los_Angeles /etc/localtime
 apt update
 apt upgrade -y
 apt install -y tzdata
+apt clean
+rm -rf /var/lib/apt/lists/*
 dpkg-reconfigure --frontend noninteractive tzdata
 EOF
 
@@ -38,6 +40,8 @@ pkgs+=(bison)           # Required build tool.
 pkgs+=(ca-certificates) # Enable TLS verification for HTTPS connections by providing trusted root certificates.
 pkgs+=(cmake)           # Required build tool.
 pkgs+=(curl)            # Dependency for tools requiring downloading data.
+pkgs+=(dpkg-dev)        # Required packaging tool.
+pkgs+=(file)            # Required packaging tool.
 pkgs+=(flex)            # Required build tool.
 pkgs+=(git)             # Required build tool.
 pkgs+=(gpg)             # Dependency for tools requiring signing or encrypting/decrypting.
@@ -47,15 +51,19 @@ pkgs+=(ninja-build)     # Required build tool.
 pkgs+=(pipx)            # Package manager for Python applications.
 pkgs+=(wget)            # Required build tool.
 apt update
-apt install -y "${pkgs[@]}"
+apt install -y --no-install-recommends "${pkgs[@]}"
+apt clean
+rm -rf /var/lib/apt/lists/*
 EOF
 
-# Install Conan.
+# Install Python-based tools.
 ARG CONAN_VERSION
-RUN PIPX_HOME=/opt/pipx \
+ARG GCOVR_VERSION
+ENV PIPX_HOME=/opt/pipx \
     PIPX_BIN_DIR=/usr/bin \
-    PIPX_MAN_DIR=/usr/share/man \
-    pipx install conan==${CONAN_VERSION}
+    PIPX_MAN_DIR=/usr/share/man
+RUN pipx install --pip-args='--no-cache' conan==${CONAN_VERSION} && \
+    pipx install --pip-args='--no-cache' gcovr==${GCOVR_VERSION}
 
 # Create the user to switch to, once all packages have been installed.
 ARG NONROOT_USER
@@ -91,9 +99,6 @@ EOF
 ENV CC=/usr/bin/gcc
 ENV CXX=/usr/bin/g++
 
-# Clean up unnecessary files to reduce image size.
-RUN rm -rf /var/lib/apt/lists/* && apt clean
-
 # Switch to the non-root user.
 USER ${NONROOT_USER}
 WORKDIR /home/${NONROOT_USER}
@@ -128,13 +133,12 @@ printf "%s\n%s\n" \
   | tee /etc/apt/sources.list.d/llvm.list
 apt update
 apt install -t llvm-toolchain-${DEBIAN_VERSION}-${CLANG_VERSION} -y --no-install-recommends clang-${CLANG_VERSION} llvm-${CLANG_VERSION}
+apt clean
+rm -rf /var/lib/apt/lists/*
 EOF
 ENV CC=/usr/bin/clang-${CLANG_VERSION}
 ENV CXX=/usr/bin/clang++-${CLANG_VERSION}
 
-# Clean up unnecessary files to reduce image size.
-RUN rm -rf /var/lib/apt/lists/* && apt clean
-
 # Switch to the non-root user.
 USER ${NONROOT_USER}
 WORKDIR /home/${NONROOT_USER}
diff --git a/docker/debian/README.md b/docker/debian/README.md
index 02bb8bc..3404230 100644
--- a/docker/debian/README.md
+++ b/docker/debian/README.md
@@ -40,7 +40,8 @@ registry.
 NONROOT_USER=${USER}
 DEBIAN_VERSION=bookworm
 GCC_VERSION=12
-CONAN_VERSION=2.17.0
+CONAN_VERSION=2.18.0
+GCOVR_VERSION=8.3
 CONTAINER_IMAGE=xrplf/ci/debian-${DEBIAN_VERSION}:gcc-${GCC_VERSION}
 
 docker buildx build . \
@@ -50,6 +51,7 @@ docker buildx build . \
   --build-arg CONAN_VERSION=${CONAN_VERSION} \
   --build-arg DEBIAN_VERSION=${DEBIAN_VERSION} \
   --build-arg GCC_VERSION=${GCC_VERSION} \
+  --build-arg GCOVR_VERSION=${GCOVR_VERSION} \
   --build-arg NONROOT_USER=${NONROOT_USER} \
   --tag ${CONTAINER_REGISTRY}/${CONTAINER_IMAGE}
 ```
@@ -63,7 +65,8 @@ registry.
 NONROOT_USER=${USER}
 DEBIAN_VERSION=bookworm
 CLANG_VERSION=17
-CONAN_VERSION=2.17.0
+CONAN_VERSION=2.18.0
+GCOVR_VERSION=8.3
 CONTAINER_IMAGE=xrplf/ci/debian-${DEBIAN_VERSION}:clang-${CLANG_VERSION}
 
 docker buildx build . \
@@ -73,6 +76,7 @@ docker buildx build . \
   --build-arg CLANG_VERSION=${CLANG_VERSION} \
   --build-arg CONAN_VERSION=${CONAN_VERSION} \
   --build-arg DEBIAN_VERSION=${DEBIAN_VERSION} \
+  --build-arg GCOVR_VERSION=${GCOVR_VERSION} \
   --build-arg NONROOT_USER=${NONROOT_USER} \
   --tag ${CONTAINER_REGISTRY}/${CONTAINER_IMAGE}
 ```
diff --git a/docker/rhel/Dockerfile b/docker/rhel/Dockerfile
index 5ea5e8b..6fe6278 100644
--- a/docker/rhel/Dockerfile
+++ b/docker/rhel/Dockerfile
@@ -22,6 +22,7 @@ RUN <<EOF
 pkgs=()
 pkgs+=(ca-certificates)  # Enable TLS verification for HTTPS connections by providing trusted root certificates.
 pkgs+=(cmake)            # Required build tool.
+pkgs+=(file)             # Required packaging tool.
 pkgs+=(git)              # Required build tool.
 pkgs+=(gpg)              # Dependency for tools requiring signing or encrypting/decrypting.
 pkgs+=(jq)               # Pretty printing.
@@ -29,17 +30,22 @@ pkgs+=(libstdc++-static) # Required to statically link libraries into rippled.
 pkgs+=(ninja-build)      # Required build tool.
 pkgs+=(perl-FindBin)     # Required to compile OpenSSL.
 pkgs+=(python3-pip)      # Package manager for Python applications.
+pkgs+=(rpm-build)        # Required packaging tool.
+pkgs+=(rpmdevtools)      # Required packaging tool.
 pkgs+=(wget)             # Required build tool.
 dnf install -y --setopt=tsflags=nodocs "${pkgs[@]}"
+dnf -y clean all
+rm -rf /var/cache/dnf/*
 EOF
 
 # Copy Bison and Flex from the Rocky Linux image.
 COPY --from=rocky /usr/bin/bison /usr/bin/bison
 COPY --from=rocky /usr/bin/flex /usr/bin/flex
 
-# Install Conan.
+# Install Python-based tools.
 ARG CONAN_VERSION
-RUN pip install conan==${CONAN_VERSION}
+ARG GCOVR_VERSION
+RUN pip install --no-cache conan==${CONAN_VERSION} gcovr==${GCOVR_VERSION}
 
 # Create the user to switch to, once all packages have been installed.
 ARG NONROOT_USER
@@ -50,13 +56,14 @@ FROM base AS gcc
 
 # Install GCC.
 ARG GCC_VERSION
-RUN dnf install -y --setopt=tsflags=nodocs gcc-toolset-${GCC_VERSION}-gcc gcc-toolset-${GCC_VERSION}-gcc-c++
+RUN <<EOF
+dnf install -y --setopt=tsflags=nodocs gcc-toolset-${GCC_VERSION}-gcc gcc-toolset-${GCC_VERSION}-gcc-c++
+dnf -y clean all
+rm -rf /var/cache/dnf/*
+EOF
 ENV CC=/usr/bin/gcc
 ENV CXX=/usr/bin/g++
 
-# Clean up unnecessary files to reduce image size.
-RUN dnf -y clean all
-
 # Switch to the non-root user.
 USER ${NONROOT_USER}
 WORKDIR /home/${NONROOT_USER}
@@ -84,13 +91,14 @@ FROM base AS clang
 
 # Install Clang. Note that in the RHEL UBIs, we cannot choose the Clang version
 # to install and we get what is available.
-RUN dnf install -y --setopt=tsflags=nodocs clang llvm
+RUN <<EOF
+dnf install -y --setopt=tsflags=nodocs clang llvm
+dnf -y clean all
+rm -rf /var/cache/dnf/*
+EOF
 ENV CC=/usr/bin/clang
 ENV CXX=/usr/bin/clang++
 
-# Clean up unnecessary files to reduce image size.
-RUN dnf -y clean all
-
 # Switch to the non-root user.
 USER ${NONROOT_USER}
 WORKDIR /home/${NONROOT_USER}
diff --git a/docker/rhel/README.md b/docker/rhel/README.md
index a6a9dc4..596680a 100644
--- a/docker/rhel/README.md
+++ b/docker/rhel/README.md
@@ -59,7 +59,8 @@ registry.
 NONROOT_USER=${USER}
 RHEL_VERSION=9.6
 GCC_VERSION=13
-CONAN_VERSION=2.17.0
+CONAN_VERSION=2.18.0
+GCOVR_VERSION=8.3
 CONTAINER_IMAGE=xrplf/ci/rhel-${RHEL_VERSION}:gcc-${GCC_VERSION}
 
 docker buildx build . \
@@ -68,6 +69,7 @@ docker buildx build . \
   --build-arg BUILDKIT_INLINE_CACHE=1 \
   --build-arg CONAN_VERSION=${CONAN_VERSION} \
   --build-arg GCC_VERSION=${GCC_VERSION} \
+  --build-arg GCOVR_VERSION=${GCOVR_VERSION} \
   --build-arg NONROOT_USER=${NONROOT_USER} \
   --build-arg RHEL_VERSION=${RHEL_VERSION} \
   --tag ${CONTAINER_REGISTRY}/${CONTAINER_IMAGE}
@@ -81,7 +83,8 @@ registry.
 ```shell
 NONROOT_USER=${USER}
 RHEL_VERSION=9.6
-CONAN_VERSION=2.17.0
+CONAN_VERSION=2.18.0
+GCOVR_VERSION=8.3
 CONTAINER_IMAGE=xrplf/ci/rhel-${RHEL_VERSION}:clang-${CLANG_VERSION}
 
 docker buildx build . \
@@ -89,6 +92,7 @@ docker buildx build . \
   --build-arg BUILDKIT_DOCKERFILE_CHECK=skip=InvalidDefaultArgInFrom \
   --build-arg BUILDKIT_INLINE_CACHE=1 \
   --build-arg CONAN_VERSION=${CONAN_VERSION} \
+  --build-arg GCOVR_VERSION=${GCOVR_VERSION} \
   --build-arg NONROOT_USER=${NONROOT_USER} \
   --build-arg RHEL_VERSION=${RHEL_VERSION} \
   --tag ${CONTAINER_REGISTRY}/${CONTAINER_IMAGE}
diff --git a/docker/ubuntu/Dockerfile b/docker/ubuntu/Dockerfile
index 4ad1370..5f21eb4 100644
--- a/docker/ubuntu/Dockerfile
+++ b/docker/ubuntu/Dockerfile
@@ -15,6 +15,8 @@ ln -fs /usr/share/zoneinfo/America/Los_Angeles /etc/localtime
 apt update
 apt upgrade -y
 apt install -y tzdata
+apt clean
+rm -rf /var/lib/apt/lists/*
 dpkg-reconfigure --frontend noninteractive tzdata
 EOF
 
@@ -27,6 +29,8 @@ pkgs+=(bison)           # Required build tool.
 pkgs+=(ca-certificates) # Enable TLS verification for HTTPS connections by providing trusted root certificates.
 pkgs+=(cmake)           # Required build tool.
 pkgs+=(curl)            # Dependency for tools requiring downloading data.
+pkgs+=(dpkg-dev)        # Required packaging tool.
+pkgs+=(file)            # Required packaging tool.
 pkgs+=(flex)            # Required build tool.
 pkgs+=(git)             # Required build tool.
 pkgs+=(gpg)             # Dependency for tools requiring signing or encrypting/decrypting.
@@ -36,15 +40,19 @@ pkgs+=(ninja-build)     # Required build tool.
 pkgs+=(pipx)            # Package manager for Python applications.
 pkgs+=(wget)            # Required build tool.
 apt update
-apt install -y "${pkgs[@]}"
+apt install -y --no-install-recommends "${pkgs[@]}"
+apt clean
+rm -rf /var/lib/apt/lists/*
 EOF
 
-# Install Conan.
+# Install Python-based tools.
 ARG CONAN_VERSION
-RUN PIPX_HOME=/opt/pipx \
+ARG GCOVR_VERSION
+ENV PIPX_HOME=/opt/pipx \
     PIPX_BIN_DIR=/usr/bin \
-    PIPX_MAN_DIR=/usr/share/man \
-    pipx install conan==${CONAN_VERSION}
+    PIPX_MAN_DIR=/usr/share/man
+RUN pipx install --pip-args='--no-cache' conan==${CONAN_VERSION} && \
+    pipx install --pip-args='--no-cache' gcovr==${GCOVR_VERSION}
 
 # Create the user to switch to, once all packages have been installed.
 ARG NONROOT_USER
@@ -55,13 +63,14 @@ FROM base AS gcc
 
 # Install GCC.
 ARG GCC_VERSION
-RUN apt install -y gcc-${GCC_VERSION} g++-${GCC_VERSION}
+RUN <<EOF
+apt install -y gcc-${GCC_VERSION} g++-${GCC_VERSION}
+apt clean
+rm -rf /var/lib/apt/lists/*
+EOF
 ENV CC=/usr/bin/gcc-${GCC_VERSION}
 ENV CXX=/usr/bin/g++-${GCC_VERSION}
 
-# Clean up unnecessary files to reduce image size.
-RUN rm -rf /var/lib/apt/lists/* && apt clean
-
 # Switch to the non-root user.
 USER ${NONROOT_USER}
 WORKDIR /home/${NONROOT_USER}
@@ -85,13 +94,14 @@ FROM base AS clang
 
 # Install Clang.
 ARG CLANG_VERSION
-RUN apt install -y clang-${CLANG_VERSION} llvm-${CLANG_VERSION}
+RUN <<EOF
+apt install -y clang-${CLANG_VERSION} llvm-${CLANG_VERSION}
+apt clean
+rm -rf /var/lib/apt/lists/*
+EOF
 ENV CC=/usr/bin/clang-${CLANG_VERSION}
 ENV CXX=/usr/bin/clang++-${CLANG_VERSION}
 
-# Clean up unnecessary files to reduce image size.
-RUN rm -rf /var/lib/apt/lists/* && apt clean
-
 # Switch to the non-root user.
 USER ${NONROOT_USER}
 WORKDIR /home/${NONROOT_USER}
diff --git a/docker/ubuntu/README.md b/docker/ubuntu/README.md
index 8e95cfc..62a7b3e 100644
--- a/docker/ubuntu/README.md
+++ b/docker/ubuntu/README.md
@@ -40,7 +40,8 @@ registry.
 NONROOT_USER=${USER}
 UBUNTU_VERSION=noble
 GCC_VERSION=14
-CONAN_VERSION=2.17.0
+CONAN_VERSION=2.18.0
+GCOVR_VERSION=8.3
 CONTAINER_IMAGE=xrplf/ci/ubuntu-${UBUNTU_VERSION}:gcc-${GCC_VERSION}
 
 docker buildx build . \
@@ -49,6 +50,7 @@ docker buildx build . \
   --build-arg BUILDKIT_INLINE_CACHE=1 \
   --build-arg CONAN_VERSION=${CONAN_VERSION} \
   --build-arg GCC_VERSION=${GCC_VERSION} \
+  --build-arg GCOVR_VERSION=${GCOVR_VERSION} \
   --build-arg NONROOT_USER=${NONROOT_USER} \
   --build-arg UBUNTU_VERSION=${UBUNTU_VERSION} \
   --tag ${CONTAINER_REGISTRY}/${CONTAINER_IMAGE}
@@ -63,7 +65,8 @@ registry.
 NONROOT_USER=${USER}
 UBUNTU_VERSION=noble
 CLANG_VERSION=18
-CONAN_VERSION=2.17.0
+CONAN_VERSION=2.18.0
+GCOVR_VERSION=8.3
 CONTAINER_IMAGE=xrplf/ci/ubuntu-${UBUNTU_VERSION}:clang-${CLANG_VERSION}
 
 docker buildx build . \
@@ -72,6 +75,7 @@ docker buildx build . \
   --build-arg BUILDKIT_INLINE_CACHE=1 \
   --build-arg CLANG_VERSION=${CLANG_VERSION} \
   --build-arg CONAN_VERSION=${CONAN_VERSION} \
+  --build-arg GCOVR_VERSION=${GCOVR_VERSION} \
   --build-arg NONROOT_USER=${NONROOT_USER} \
   --build-arg UBUNTU_VERSION=${UBUNTU_VERSION} \
   --tag ${CONTAINER_REGISTRY}/${CONTAINER_IMAGE}