rw-core and ro-core build fails

The following error is produced when building rw-core and ro-core:

Step 2/29 : RUN apk add --no-cache wget=1.20.3-r0 git=2.20.1-r0 make=4.2.1-r2 build-base=0.5-r1 protobuf=3.6.1-r1 protobuf-dev=3.6.1-r1
---> Running in f04650129d3f
fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/community/x86_64/APKINDEX.tar.gz
ERROR: unsatisfiable constraints:
 git-2.20.2-r0:
breaks: world[git=2.20.1-r0]
The command '/bin/sh -c apk add --no-cache wget=1.20.3-r0 git=2.20.1-r0 make=4.2.1-r2 build-base=0.5-r1 protobuf=3.6.1-r1 protobuf-dev=3.6.1-r1' returned a non-zero code: 1
Makefile:140: recipe for target 'rw_core' failed