diff --git a/backup/requirements-dev.txt b/backup/requirements-dev.txt
new file mode 100644
index 0000000..d2548c4
--- /dev/null
+++ b/backup/requirements-dev.txt
@@ -0,0 +1 @@
+pyln-testing ~= 0.9.2
diff --git a/backup/requirements.txt b/backup/requirements.txt
index 80e941d..9c00eb1 100644
--- a/backup/requirements.txt
+++ b/backup/requirements.txt
@@ -2,3 +2,4 @@ Click==7.0
 flaky>=3.6.1
 tqdm>=4.45
 psutil>=5
+pyln-client ~= 0.9.2
diff --git a/donations/requirements-dev.txt b/donations/requirements-dev.txt
new file mode 100644
index 0000000..d2548c4
--- /dev/null
+++ b/donations/requirements-dev.txt
@@ -0,0 +1 @@
+pyln-testing ~= 0.9.2
diff --git a/drain/requirements-dev.txt b/drain/requirements-dev.txt
new file mode 100644
index 0000000..40f8284
--- /dev/null
+++ b/drain/requirements-dev.txt
@@ -0,0 +1 @@
+flaky==3.7.0
diff --git a/helpme/requirements-dev.txt b/helpme/requirements-dev.txt
new file mode 100644
index 0000000..d2548c4
--- /dev/null
+++ b/helpme/requirements-dev.txt
@@ -0,0 +1 @@
+pyln-testing ~= 0.9.2
diff --git a/noise/requirements-dev.txt b/noise/requirements-dev.txt
new file mode 100644
index 0000000..dd26539
--- /dev/null
+++ b/noise/requirements-dev.txt
@@ -0,0 +1 @@
+flaky ~= 3.7.0
diff --git a/request-invoice/requirements.txt b/request-invoice/requirements.txt
index 03da153..1b0b2ce 100644
--- a/request-invoice/requirements.txt
+++ b/request-invoice/requirements.txt
@@ -1,5 +1,5 @@
 python-dotenv>=0.13.0
-flask
+flask==1.1.1
 flask-limiter
 tornado
 pyln-client