diff --git a/builder/package.centos-7 b/builder/package.centos-7
index 76b2ee2..203bd55 100644
--- a/builder/package.centos-7
+++ b/builder/package.centos-7
@@ -15,6 +15,12 @@ if [ -d /opt/R/${R_VERSION} ]; then
 fi
 EOF
 
+# Preserve the default HTTP user agent for R 3.6+
+cat <<'EOF' >> /opt/R/${R_VERSION}/lib/R/etc/Rprofile.site
+# Add OS version info to the HTTP user agent
+options(HTTPUserAgent = paste(c(utils::sessionInfo()$running, getOption("HTTPUserAgent")), collapse = "; "))
+EOF
+
 fpm \
   -s dir \
   -t rpm \
diff --git a/builder/package.debian-9 b/builder/package.debian-9
index 6780327..f6ee032 100644
--- a/builder/package.debian-9
+++ b/builder/package.debian-9
@@ -2,6 +2,12 @@ if [[ ! -d /tmp/output/debian-9 ]]; then
   mkdir -p /tmp/output/debian-9
 fi
 
+# Preserve the default HTTP user agent for R 3.6+
+cat <<'EOF' >> /opt/R/${R_VERSION}/lib/R/etc/Rprofile.site
+# Add OS version info to the HTTP user agent
+options(HTTPUserAgent = paste(c(utils::sessionInfo()$running, getOption("HTTPUserAgent")), collapse = "; "))
+EOF
+
 fpm \
   -s dir \
   -t deb \
diff --git a/builder/package.opensuse-15 b/builder/package.opensuse-15
index 58e14ff..bb0e244 100644
--- a/builder/package.opensuse-15
+++ b/builder/package.opensuse-15
@@ -15,6 +15,12 @@ if [ -d /opt/R/${R_VERSION} ]; then
 fi
 EOF
 
+# Preserve the default HTTP user agent for R 3.6+
+cat <<'EOF' >> /opt/R/${R_VERSION}/lib/R/etc/Rprofile.site
+# Add OS version info to the HTTP user agent
+options(HTTPUserAgent = paste(c(utils::sessionInfo()$running, getOption("HTTPUserAgent")), collapse = "; "))
+EOF
+
 fpm \
   -s dir \
   -t rpm \
diff --git a/builder/package.opensuse-42 b/builder/package.opensuse-42
index 4cc1837..88e1c85 100644
--- a/builder/package.opensuse-42
+++ b/builder/package.opensuse-42
@@ -15,6 +15,12 @@ if [ -d /opt/R/${R_VERSION} ]; then
 fi
 EOF
 
+# Preserve the default HTTP user agent for R 3.6+
+cat <<'EOF' >> /opt/R/${R_VERSION}/lib/R/etc/Rprofile.site
+# Add OS version info to the HTTP user agent
+options(HTTPUserAgent = paste(c(utils::sessionInfo()$running, getOption("HTTPUserAgent")), collapse = "; "))
+EOF
+
 fpm \
   -s dir \
   -t rpm \
diff --git a/builder/package.ubuntu-1604 b/builder/package.ubuntu-1604
index 33aa081..4761d06 100644
--- a/builder/package.ubuntu-1604
+++ b/builder/package.ubuntu-1604
@@ -2,6 +2,12 @@ if [[ ! -d /tmp/output/ubuntu-1604 ]]; then
   mkdir -p /tmp/output/ubuntu-1604
 fi
 
+# Preserve the default HTTP user agent for R 3.6+
+cat <<'EOF' >> /opt/R/${R_VERSION}/lib/R/etc/Rprofile.site
+# Add OS version info to the HTTP user agent
+options(HTTPUserAgent = paste(c(utils::sessionInfo()$running, getOption("HTTPUserAgent")), collapse = "; "))
+EOF
+
 fpm \
   -s dir \
   -t deb \
diff --git a/builder/package.ubuntu-1804 b/builder/package.ubuntu-1804
index 2b3f7c4..dac01d8 100644
--- a/builder/package.ubuntu-1804
+++ b/builder/package.ubuntu-1804
@@ -2,6 +2,12 @@ if [[ ! -d /tmp/output/ubuntu-1804 ]]; then
   mkdir -p /tmp/output/ubuntu-1804
 fi
 
+# Preserve the default HTTP user agent for R 3.6+
+cat <<'EOF' >> /opt/R/${R_VERSION}/lib/R/etc/Rprofile.site
+# Add OS version info to the HTTP user agent
+options(HTTPUserAgent = paste(c(utils::sessionInfo()$running, getOption("HTTPUserAgent")), collapse = "; "))
+EOF
+
 fpm \
   -s dir \
   -t deb \