I am getting the following error when I try to do pod update. once it failed, I am not even able to do pod install anymore.
Installing FBSDKCoreKit (4.36.0)
[!] Error installing FBSDKCoreKit [!] /usr/bin/git clone https://github.com/facebook/facebook-ios-sdk.git /var/folders/tq/jky5s5j1589c5nqhs3n7j3d00000gn/T/d20180831-29436-tmqja3 --template= --single-branch --depth 1 --branch sdk-version-4.36.0
Cloning into '/var/folders/tq/jky5s5j1589c5nqhs3n7j3d00000gn/T/d20180831-29436-tmqja3'... warning: Could not find remote branch sdk-version-4.36.0 to clone. fatal: Remote branch sdk-version-4.36.0 not found in upstream origin
According to the change log, version 4.36.0 was released yesterday (30th August). It looks like they've forgotten to create a release tag for it yet in their Github repository hosting the Facebook iOS SDK.
In the meantime you can set your pod to:
pod 'FBSDKCoreKit', '4.35' pod 'FBSDKLoginKit', '4.35' pod 'FBSDKShareKit', '4.35'`
then pod update.