diff --git a/Project.toml b/Project.toml
index 1ab5e89..2e945cf 100644
--- a/Project.toml
+++ b/Project.toml
@@ -10,9 +10,9 @@ Primes = "27ebfcd6-29c5-5fa9-bf4b-fb8fc14df3ae"
 LRUCache = "8ac3fa9e-de4c-5943-b1dc-09c6b5f20637"
 
 [compat]
-RationalRoots = "0.1 - 1"
+RationalRoots = "0.1 - 0.9"
 HalfIntegers = "1"
-Primes = "0.4 - 1"
+Primes = "0.4 - 0.9"
 LRUCache = "1.3"
 julia = "1.5"
 
diff --git a/README.md b/README.md
index 2f5326e..b6de15e 100644
--- a/README.md
+++ b/README.md
@@ -19,9 +19,9 @@ may be added in the future).
 WignerSymbols.jl does no longer store the Wigner 3j and 6j symbols in a `Dict` cache, but
 rather in an `LRU` cache from [LRUCache.jl](https://github.com/JuliaCollections/
 LRUCache.jl). Hence, it no longer stores all Wigner symbols ever computed, but only the
-most recent ones. By default, it stores the $10^6$ most recent ones, which is probably
-equivalent to storing all of them in most use cases. This number can be changed via the
-interface
+most recent ones, and it that sense this is a (softly) breaking release. By default, it
+stores the $10^6$ most recent ones, which is probably equivalent to storing all of them in
+most use cases. This number can be changed via the interface
 ```julia
 WignerSymbols.set_buffer3j_size(; maxsize = ...)
 WignerSymbols.set_buffer6j_size(; maxsize = ...)