diff --git a/run_tests.sh b/run_tests.sh
index 2cbcab6..e0a6ef0 100755
--- a/run_tests.sh
+++ b/run_tests.sh
@@ -3,12 +3,29 @@
 
 cd "$(dirname "$0")"
 
-# Default to Hermes python (has pytest), fall back to system python
-if [ -f "/opt/hermes/tools/python-3.14.9+202****1021-linux-x64/bin/python" ]; then
-    PYTHON="/opt/hermes/tools/python-3.14.9+202****1021-linux-x64/bin/python"
-elif command -v python3 &>/dev/null && python3 -c "import pytest" 2>/dev/null; then
-    PYTHON="python3"
-else
+# Find python with pytest support (Hermes environment or system)
+PYTHON=""
+
+# Try Hermes python first
+for p in /opt/hermes/tools/python-*/bin/python; do
+    if [ -f "$p" ] && "$p" -c "import pytest" 2>/dev/null; then
+        PYTHON="$p"
+        break
+    fi
+done
+
+# Fall back to system python3 with pytest
+if [ -z "$PYTHON" ]; then
+    for cmd in python3 python; do
+        if command -v $cmd &>/dev/null && $cmd -c "import pytest" 2>/dev/null; then
+            PYTHON="$cmd"
+            break
+        fi
+    done
+fi
+
+# Error if no suitable python found
+if [ -z "$PYTHON" ]; then
     echo "Error: pytest not found. Try:"
     echo "  pip install pytest numpy psutil Pillow"
     exit 1