diff --git a/configure b/configure
index 77aebbd..b2b0bb0 100644
--- a/configure
+++ b/configure
@@ -1816,12 +1816,12 @@ python3 -m venv .venv
 
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: installing dependencies..." >&5
 printf "%s\n" "$as_me: installing dependencies..." >&6;}
-.venv/bin/pip install requirements.txt
+.venv/bin/pip install --requirement requirements.txt
 
 # install dev dependencies seperately, for clarity
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: installing dev dependencies..." >&5
 printf "%s\n" "$as_me: installing dev dependencies..." >&6;}
-.venv/bin/pip install requirements-dev.txt
+.venv/bin/pip install --requirement requirements-dev.txt
 
 cat >confcache <<\_ACEOF
 # This file is a shell script that caches the results of configure
diff --git a/configure.ac b/configure.ac
index 0670954..73cd4aa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -10,10 +10,10 @@ AC_MSG_NOTICE([initializing python3 venv...])
 python3 -m venv .venv
 
 AC_MSG_NOTICE([installing dependencies...])
-.venv/bin/pip install requirements.txt
+.venv/bin/pip install --requirement requirements.txt
 
 # install dev dependencies seperately, for clarity
 AC_MSG_NOTICE([installing dev dependencies...])
-.venv/bin/pip install requirements-dev.txt
+.venv/bin/pip install --requirement requirements-dev.txt
 
 AC_OUTPUT