diff --git a/letsencrypt-auto-source/letsencrypt-auto b/letsencrypt-auto-source/letsencrypt-auto
index a3fc58801..d1d80d500 100755
--- a/letsencrypt-auto-source/letsencrypt-auto
+++ b/letsencrypt-auto-source/letsencrypt-auto
@@ -792,7 +792,7 @@ UNLIKELY_EOF
     # Set PATH so pipstrap upgrades the right (v)env:
     PATH="$VENV_BIN:$PATH" "$VENV_BIN/python" "$TEMP_DIR/pipstrap.py"
     set +e
-    PIP_OUT=`"$VENV_BIN/pip" install --require-hashes -r "$TEMP_DIR/letsencrypt-auto-requirements.txt" 2>&1`
+    PIP_OUT=`"$VENV_BIN/pip" install --no-cache-dir --require-hashes -r "$TEMP_DIR/letsencrypt-auto-requirements.txt" 2>&1`
     PIP_STATUS=$?
     set -e
     rm -rf "$TEMP_DIR"
diff --git a/letsencrypt-auto-source/letsencrypt-auto.template b/letsencrypt-auto-source/letsencrypt-auto.template
index f0bb89215..40edca7fe 100755
--- a/letsencrypt-auto-source/letsencrypt-auto.template
+++ b/letsencrypt-auto-source/letsencrypt-auto.template
@@ -205,7 +205,7 @@ UNLIKELY_EOF
     # Set PATH so pipstrap upgrades the right (v)env:
     PATH="$VENV_BIN:$PATH" "$VENV_BIN/python" "$TEMP_DIR/pipstrap.py"
     set +e
-    PIP_OUT=`"$VENV_BIN/pip" install --require-hashes -r "$TEMP_DIR/letsencrypt-auto-requirements.txt" 2>&1`
+    PIP_OUT=`"$VENV_BIN/pip" install --no-cache-dir --require-hashes -r "$TEMP_DIR/letsencrypt-auto-requirements.txt" 2>&1`
     PIP_STATUS=$?
     set -e
     rm -rf "$TEMP_DIR"