diff --git a/Dockerfile b/Dockerfile
index 202fb1a..dfaf039 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # python 3
-FROM continuumio/miniconda3
+FROM continuumio/miniconda3:4.5
 
 MAINTAINER K. Shankari (shankari@eecs.berkeley.edu)
 # set working directory
diff --git a/Dockerfile.dev.server-only b/Dockerfile.dev.server-only
index d056cd1..7a9aecb 100644
--- a/Dockerfile.dev.server-only
+++ b/Dockerfile.dev.server-only
@@ -1,5 +1,5 @@
 # python 3
-FROM continuumio/miniconda3
+FROM continuumio/miniconda3:4.5
 
 MAINTAINER K. Shankari (shankari@eecs.berkeley.edu)
 
diff --git a/Dockerfile.nomkl b/Dockerfile.nomkl
index fd8b69f..c5e2d2f 100644
--- a/Dockerfile.nomkl
+++ b/Dockerfile.nomkl
@@ -1,5 +1,5 @@
 # python 3
-FROM continuumio/miniconda3
+FROM continuumio/miniconda3:4.5
 
 MAINTAINER K. Shankari (shankari@eecs.berkeley.edu)
 # set working directory