diff --git a/10.0/base_requirements.txt b/10.0/base_requirements.txt
index 834ae5f4..59d63f72 100644
--- a/10.0/base_requirements.txt
+++ b/10.0/base_requirements.txt
@@ -63,6 +63,7 @@ urllib3==1.24.2
 
 # Migration tools
 ruamel.yaml==0.16.13
+ruamel.yaml.clib==0.2.2
 marabunta==0.10.5
 anthem==0.13.0
 
@@ -73,9 +74,9 @@ flake8
 pytest==4.6
 pluggy
 pytest-odoo
-coverage
+coverage==5.5
 watchdog==0.10.6
-pytest-cov
+pytest-cov==2.12.1
 
 # Library dependency
 argh==0.26.2
diff --git a/7.0/base_requirements.txt b/7.0/base_requirements.txt
index 80fb2662..49312aec 100644
--- a/7.0/base_requirements.txt
+++ b/7.0/base_requirements.txt
@@ -47,6 +47,7 @@ xlwt==0.7.5
 
 # Migration tools
 ruamel.yaml==0.16.13
+ruamel.yaml.clib==0.2.2
 marabunta==0.10.5
 ERPpeek==1.7.1
 
@@ -56,9 +57,9 @@ ERPpeek==1.7.1
 flake8
 pytest==4.6
 pytest-odoo
-coverage
+coverage==5.5
 watchdog==0.10.6
-pytest-cov
+pytest-cov==2.12.1
 
 # Library dependency
 argh==0.26.2
diff --git a/8.0/base_requirements.txt b/8.0/base_requirements.txt
index 77b69732..452ceaa0 100644
--- a/8.0/base_requirements.txt
+++ b/8.0/base_requirements.txt
@@ -47,6 +47,7 @@ xlwt==0.7.5
 
 # Migration tools
 ruamel.yaml==0.16.13
+ruamel.yaml.clib==0.2.2
 marabunta==0.10.5
 ERPpeek==1.7.1
 
@@ -56,9 +57,9 @@ ERPpeek==1.7.1
 flake8
 pytest==4.6
 pytest-odoo
-coverage
+coverage==5.5
 watchdog==0.10.6
-pytest-cov
+pytest-cov==2.12.1
 
 # Library dependency
 argh==0.26.2
diff --git a/9.0/base_requirements.txt b/9.0/base_requirements.txt
index 0da79201..ce4b10f8 100644
--- a/9.0/base_requirements.txt
+++ b/9.0/base_requirements.txt
@@ -54,6 +54,7 @@ suds-jurko==0.6
 
 # Migration tools
 ruamel.yaml==0.16.13
+ruamel.yaml.clib==0.2.2
 marabunta==0.10.5
 anthem==0.13.0
 
@@ -63,9 +64,9 @@ anthem==0.13.0
 flake8
 pytest==4.6
 pytest-odoo
-coverage
+coverage==5.5
 watchdog==0.10.6
-pytest-cov
+pytest-cov==2.12.1
 
 # Library dependency
 argh==0.26.2
diff --git a/HISTORY.rst b/HISTORY.rst
index 0fa39542..f97e7c81 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -37,6 +37,7 @@ Unreleased
 * [11.0-15.0] Fix setuptools for compat with 2to3 still in used in pinned dependencies
 * [12.0-15.0] Get proper wkhtml version for >= buster releases (includes bullseye)
 * [15.0] zeep replaces suds-jurko
+* [9.0,10.0] pin libraries that dropped python2.7 support (pytest-cov, watchdog and ruamel.yaml.clib)
 
 **Build**