diff --git a/dev_requirements.txt b/dev_requirements.txt
index ff43f4b126a17069d548440a35f61b1a032d1a46..0c497390497e75680475272faef62d8a87fe9c4d 100644
--- a/dev_requirements.txt
+++ b/dev_requirements.txt
@@ -1,4 +1,4 @@
-pyldap>=3.0.0  # here instead of requirements.txt so rtfd can build
-Sphinx>=1.5.5
+python-ldap==3.2.0  # here instead of requirements.txt so rtfd can build
+Sphinx==2.1.2
 
 -r requirements.txt
diff --git a/requirements.txt b/requirements.txt
index dd513e009161f362ff4f77e98fb950b64649571d..88522a19cea56db4923c1b520071e24113327383 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-Flask>=0.12.4
-mock>=2.0.0  # for ci
+Flask==1.1.1
+mock==3.0.5  # for ci