diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index b55aa6c4..225d3369 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -25,12 +25,11 @@ jobs:
   strategy:
     matrix:
       Python27:
-        python.version: '>= 2.7'
+        python.version: '2.7.15'
       Python36:
-        python.version: '>= 3.6'
+        python.version: '3.6.8'
       Python37:
-        python.version: '>= 3.7'
-        python.architecture: x64
+        python.version: '3.7.2'
     maxParallel: 4
   steps:
   - template: .azure-pipelines/steps/run-tests.yml
@@ -49,13 +48,13 @@ jobs:
   strategy:
     matrix:
       Python27:
-        python.version: '>= 2.7'
+        python.version: '2.7'
         python.architecture: x64
       Python36:
-        python.version: '>= 3.6'
+        python.version: '3.6'
         python.architecture: x64
       Python37:
-        python.version: '>= 3.7'
+        python.version: '3.7'
         python.architecture: x64
     maxParallel: 4
   steps:
@@ -69,11 +68,11 @@ jobs:
   strategy:
     matrix:
       Python27:
-        python.version: '>= 2.7'
+        python.version: '2.7.15'
       Python36:
-        python.version: '>= 3.6'
+        python.version: '3.6.8'
       Python37:
-        python.version: '>= 3.7'
+        python.version: '3.7.2'
     maxParallel: 4
   steps:
   - template: .azure-pipelines/steps/run-tests.yml