diff --git a/docker/base/Dockerfile b/docker/base/Dockerfile
index bd564d971b..87d6aa9d80 100644
--- a/docker/base/Dockerfile
+++ b/docker/base/Dockerfile
@@ -87,14 +87,16 @@ RUN curl -sS https://releases.nixos.org/patchelf/patchelf-0.9/patchelf-0.9.tar.b
     rm -rf /tmp/patchelf-*
 
 # Install Ruby, for Ruby fuzzing.
-RUN apt-get install -y binutils xz-utils libyaml-dev libffi-dev zlib1g-dev && \
+RUN apt-get update && apt-get install -y binutils xz-utils libyaml-dev libffi-dev zlib1g-dev && \
     RUBY_VERSION=3.3.1 && \
     curl -O https://cache.ruby-lang.org/pub/ruby/3.3/ruby-$RUBY_VERSION.tar.gz && \
     tar -xvf ruby-$RUBY_VERSION.tar.gz && \
     cd ruby-$RUBY_VERSION && \
     ./configure && \
     make -j$(nproc) && \
-    make install
+    make install && \
+    cd - && \
+    rm -rf ruby-$RUBY_VERSION ruby-$RUBY_VERSION.tar.gz
 
 # Install OpenJDK 17 for Jazzer (Java fuzzer).
 # Copied from gcr.io/oss-fuzz-base/base-runner.
diff --git a/docker/base/ubuntu-20-04.Dockerfile b/docker/base/ubuntu-20-04.Dockerfile
index f44b239108..51e625a97a 100644
--- a/docker/base/ubuntu-20-04.Dockerfile
+++ b/docker/base/ubuntu-20-04.Dockerfile
@@ -87,14 +87,16 @@ RUN curl -sS https://releases.nixos.org/patchelf/patchelf-0.9/patchelf-0.9.tar.b
     rm -rf /tmp/patchelf-*
 
 # Install Ruby, for Ruby fuzzing.
-RUN apt-get install -y binutils xz-utils libyaml-dev libffi-dev zlib1g-dev && \
+RUN apt-get update && apt-get install -y binutils xz-utils libyaml-dev libffi-dev zlib1g-dev && \
     RUBY_VERSION=3.3.1 && \
     curl -O https://cache.ruby-lang.org/pub/ruby/3.3/ruby-$RUBY_VERSION.tar.gz && \
     tar -xvf ruby-$RUBY_VERSION.tar.gz && \
     cd ruby-$RUBY_VERSION && \
     ./configure && \
     make -j$(nproc) && \
-    make install
+    make install && \
+    cd - && \
+    rm -rf ruby-$RUBY_VERSION ruby-$RUBY_VERSION.tar.gz
 
 # Install OpenJDK 17 for Jazzer (Java fuzzer).
 # Copied from gcr.io/oss-fuzz-base/base-runner.
diff --git a/docker/base/ubuntu-24-04.Dockerfile b/docker/base/ubuntu-24-04.Dockerfile
index 7a63f5648e..f3487373bd 100644
--- a/docker/base/ubuntu-24-04.Dockerfile
+++ b/docker/base/ubuntu-24-04.Dockerfile
@@ -64,14 +64,16 @@ RUN curl -sS https://releases.nixos.org/patchelf/patchelf-0.9/patchelf-0.9.tar.b
     rm -rf /tmp/patchelf-*
 
 # Install Ruby, for Ruby fuzzing.
-RUN apt-get install -y binutils xz-utils libyaml-dev libffi-dev zlib1g-dev && \
+RUN apt-get update && apt-get install -y binutils xz-utils libyaml-dev libffi-dev zlib1g-dev && \
     RUBY_VERSION=3.3.1 && \
     curl -O https://cache.ruby-lang.org/pub/ruby/3.3/ruby-$RUBY_VERSION.tar.gz && \
     tar -xvf ruby-$RUBY_VERSION.tar.gz && \
     cd ruby-$RUBY_VERSION && \
     ./configure && \
     make -j$(nproc) && \
-    make install
+    make install && \
+    cd - && \
+    rm -rf ruby-$RUBY_VERSION ruby-$RUBY_VERSION.tar.gz
 
 # Install OpenJDK 17 for Jazzer (Java fuzzer).
 # Copied from gcr.io/oss-fuzz-base/base-runner.
diff --git a/docker/chromium/base/ubuntu-24-04.Dockerfile b/docker/chromium/base/ubuntu-24-04.Dockerfile
index 9175f27410..a19ccff5f2 100644
--- a/docker/chromium/base/ubuntu-24-04.Dockerfile
+++ b/docker/chromium/base/ubuntu-24-04.Dockerfile
@@ -12,7 +12,7 @@ ENV UPDATE_WEB_TESTS True
 
 # Note: snapcraft installation seems to always fail.
 RUN ln -s /usr/local/bin/python3.11 /usr/local/bin/python3
-RUN echo ttf-mscorefonts-installer msttcorefonts/accepted-mscorefonts-eula select true | debconf-set-selections &&     curl 'https://chromium.googlesource.com/chromium/src/+/main/build/install-build-deps.py?format=TEXT' | base64 -d > /tmp/install-build-deps.py &&     sed -i s/snapcraft/doesnotexist/ /tmp/install-build-deps.py &&     sed -i "s/if requires_pinned_linux_libc():/if False:/" /tmp/install-build-deps.py &&     chmod u+x /tmp/install-build-deps.py &&     /tmp/install-build-deps.py --backwards-compatible --no-prompt --no-chromeos-fonts --syms --lib32
+RUN apt-get update && echo ttf-mscorefonts-installer msttcorefonts/accepted-mscorefonts-eula select true | debconf-set-selections &&     curl 'https://chromium.googlesource.com/chromium/src/+/main/build/install-build-deps.py?format=TEXT' | base64 -d > /tmp/install-build-deps.py &&     sed -i s/snapcraft/doesnotexist/ /tmp/install-build-deps.py &&     sed -i "s/if requires_pinned_linux_libc():/if False:/" /tmp/install-build-deps.py &&     chmod u+x /tmp/install-build-deps.py &&     /tmp/install-build-deps.py --backwards-compatible --no-prompt --no-chromeos-fonts --syms --lib32
 
 
 RUN dpkg --add-architecture i386 && \