diff --git a/tests/requirements.lock b/tests/requirements.lock
new file mode 100644
index 0000000..fd95fdb
--- /dev/null
+++ b/tests/requirements.lock
@@ -0,0 +1,19 @@
+# Tests pass with these versions 2024-04-03
+# pip install --no-deps -r tests/requirements.lock
+hjson==3.1.0
+mo-collections==5.556.24070
+mo-dots==9.578.24081
+mo-files==6.556.24070
+mo-future==7.546.24057
+mo-imports==7.546.24057
+mo-json==6.556.24070
+mo-kwargs==7.551.24062
+mo-logs==8.556.24070
+mo-math==7.552.24062
+mo-parsing==8.581.24094
+mo-sql-parsing==10.581.24094
+mo-streams==1.556.24070
+mo-testing==7.559.24071
+mo-threads==6.556.24070
+mo-times==5.556.24070
+zstandard==0.22.0
\ No newline at end of file
diff --git a/tests/requirements.txt b/tests/requirements.txt
index 2868250..c9e22ea 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,5 +1,5 @@
-mo-testing
-mo-threads
-mo-files
-mo-streams
-zstandard
+mo-testing>=7.559.24071
+mo-threads>=6.556.24070
+mo-files>=6.556.24070
+mo-streams>=1.556.24070
+zstandard>=0.22.0
\ No newline at end of file