diff --git a/dotnet-build-server/3.1/Dockerfile b/dotnet-build-server/3.1/Dockerfile
index 4ba54723dd7e9a42589013545fa1aeac944f0605..6a04de232654c101759919d890dcf7df09f7d970 100644
--- a/dotnet-build-server/3.1/Dockerfile
+++ b/dotnet-build-server/3.1/Dockerfile
@@ -13,8 +13,9 @@ LABEL org.label-schema.build-date=$BUILD_DATE \
       maintainer="Roger Feese <rfeese@nebraska.edu>"
 
 # Make sure that tools we need are installed
-RUN apt-get update \
-    && apt-get install git
+RUN apt-get update && apt-get install -y \
+    git \
+    && rm -rf /var/lib/apt/lists/*
 
 # sonarscanner (https://docs.sonarqube.org/latest/analysis/scan/sonarscanner-for-msbuild/)
 RUN dotnet tool install --global dotnet-sonarscanner
diff --git a/dotnet-build-server/5.0/Dockerfile b/dotnet-build-server/5.0/Dockerfile
index a4da455aaed870ebc924a5437581ff14d8a59bfb..8043c2d92090d1f40f0b3a596e34231afebd1876 100644
--- a/dotnet-build-server/5.0/Dockerfile
+++ b/dotnet-build-server/5.0/Dockerfile
@@ -13,8 +13,9 @@ LABEL org.label-schema.build-date=$BUILD_DATE \
       maintainer="Roger Feese <rfeese@nebraska.edu>"
 
 # Make sure that tools we need are installed
-RUN apt-get update \
-    && apt-get install git
+RUN apt-get update && apt-get install -y \
+    git \
+    && rm -rf /var/lib/apt/lists/*
 
 # sonarscanner (https://docs.sonarqube.org/latest/analysis/scan/sonarscanner-for-msbuild/)
 RUN dotnet tool install --global dotnet-sonarscanner