diff --git a/src/context_implementations.jl b/src/context_implementations.jl
index 462012676..51c7a1ed5 100644
--- a/src/context_implementations.jl
+++ b/src/context_implementations.jl
@@ -195,7 +195,7 @@ function tilde_observe!!(context, right, left, vi)
     return left, acclogp_observe!!(context, vi, logp)
 end
 
-function assume(rng, spl::Sampler, dist)
+function assume(rng::Random.AbstractRNG, spl::Sampler, dist)
     return error("DynamicPPL.assume: unmanaged inference algorithm: $(typeof(spl))")
 end
 
@@ -291,14 +291,18 @@ end
 function dot_tilde_assume(::IsLeaf, ::AbstractContext, right, left, vns, vi)
     return dot_assume(right, left, vns, vi)
 end
-function dot_tilde_assume(::IsLeaf, rng, ::AbstractContext, sampler, right, left, vns, vi)
+function dot_tilde_assume(
+    ::IsLeaf, rng::Random.AbstractRNG, ::AbstractContext, sampler, right, left, vns, vi
+)
     return dot_assume(rng, sampler, right, vns, left, vi)
 end
 
 function dot_tilde_assume(::IsParent, context::AbstractContext, args...)
     return dot_tilde_assume(childcontext(context), args...)
 end
-function dot_tilde_assume(::IsParent, rng, context::AbstractContext, args...)
+function dot_tilde_assume(
+    ::IsParent, rng::Random.AbstractRNG, context::AbstractContext, args...
+)
     return dot_tilde_assume(rng, childcontext(context), args...)
 end
 
@@ -371,7 +375,7 @@ function dot_assume(
 end
 
 function dot_assume(
-    rng,
+    rng::Random.AbstractRNG,
     spl::Union{SampleFromPrior,SampleFromUniform},
     dist::MultivariateDistribution,
     vns::AbstractVector{<:VarName},
@@ -404,7 +408,7 @@ function dot_assume(
 end
 
 function dot_assume(
-    rng,
+    rng::Random.AbstractRNG,
     spl::Union{SampleFromPrior,SampleFromUniform},
     dists::Union{Distribution,AbstractArray{<:Distribution}},
     vns::AbstractArray{<:VarName},
@@ -416,7 +420,9 @@ function dot_assume(
     lp = sum(Bijectors.logpdf_with_trans.(dists, r, istrans.((vi,), vns)))
     return r, lp, vi
 end
-function dot_assume(rng, spl::Sampler, ::Any, ::AbstractArray{<:VarName}, ::Any, ::Any)
+function dot_assume(
+    rng::Random.AbstractRNG, spl::Sampler, ::Any, ::AbstractArray{<:VarName}, ::Any, ::Any
+)
     return error(
         "[DynamicPPL] $(alg_str(spl)) doesn't support vectorizing assume statement"
     )
@@ -436,7 +442,7 @@ function _maybe_invlink_broadcast(vi, vn, dist)
 end
 
 function get_and_set_val!(
-    rng,
+    rng::Random.AbstractRNG,
     vi::VarInfoOrThreadSafeVarInfo,
     vns::AbstractVector{<:VarName},
     dist::MultivariateDistribution,
@@ -478,7 +484,7 @@ function get_and_set_val!(
 end
 
 function get_and_set_val!(
-    rng,
+    rng::Random.AbstractRNG,
     vi::VarInfoOrThreadSafeVarInfo,
     vns::AbstractArray{<:VarName},
     dists::Union{Distribution,AbstractArray{<:Distribution}},