diff --git a/scripts/base/frameworks/cluster/nodes/logger.zeek b/scripts/base/frameworks/cluster/nodes/logger.zeek
index 9d0d4121c8..1021cee100 100644
--- a/scripts/base/frameworks/cluster/nodes/logger.zeek
+++ b/scripts/base/frameworks/cluster/nodes/logger.zeek
@@ -36,8 +36,6 @@ function archiver_rotation_format_func(ri: Log::RotationFmtInfo): Log::RotationP
 
 @if ( Supervisor::is_supervised() )
 
-global supervisor_rotation_format_func = archiver_rotation_format_func &deprecated="Remove in v5.1.  Use 'archiver_rotation_format_func'.";
-
 redef Log::default_rotation_dir = "log-queue";
 
 redef Log::rotation_format_func = archiver_rotation_format_func;
diff --git a/src/Conn.h b/src/Conn.h
index bbd1d6c386..b13c7ab850 100644
--- a/src/Conn.h
+++ b/src/Conn.h
@@ -71,8 +71,6 @@ struct ConnTuple
 	TransportProto proto;
 	};
 
-using ConnID [[deprecated("Remove in v5.1. Use zeek::ConnTuple.")]] = ConnTuple;
-
 static inline int addr_port_canon_lt(const IPAddr& addr1, uint32_t p1, const IPAddr& addr2,
                                      uint32_t p2)
 	{
diff --git a/src/IPAddr.h b/src/IPAddr.h
index 3a18fd9a56..a5d37a0e45 100644
--- a/src/IPAddr.h
+++ b/src/IPAddr.h
@@ -54,8 +54,6 @@ private:
 	          TransportProto t, bool one_way);
 	};
 
-using ConnIDKey [[deprecated("Remove in v5.1. Use zeek::detail::ConnKey.")]] = ConnKey;
-
 	} // namespace detail
 
 /**
diff --git a/src/Queue.h b/src/Queue.h
deleted file mode 100644
index 7600aacce4..0000000000
--- a/src/Queue.h
+++ /dev/null
@@ -1,202 +0,0 @@
-// See the file "COPYING" in the main distribution directory for copyright.
-
-#pragma once
-
-#include <cstring>
-#include <iterator>
-
-// Queue.h --
-//	Interface for class Queue, current implementation is as an
-//	array of ent's.  This implementation was chosen to optimize
-//	getting to the ent's rather than inserting and deleting.
-//	Also push's and pop's from the front or the end of the queue
-//	are very efficient.  The only really expensive operation
-//	is resizing the list, which involves getting new space
-//	and moving the data.  Resizing occurs automatically when inserting
-//	more elements than the list can currently hold.  Automatic
-//	resizing is done one "chunk_size" of elements at a time and
-//	always increases the size of the list.  Resizing to zero
-//	(or to less than the current value of num_entries)
-//	will decrease the size of the list to the current number of
-//	elements.  Resize returns the new max_entries.
-//
-//	Entries must be either a pointer to the data or nonzero data with
-//	sizeof(data) <= sizeof(void*).
-
-namespace zeek
-	{
-
-template <typename T>
-class [[deprecated("Remove in v5.1. This class is deprecated (and is likely broken, see #1528). "
-                   "Use std::vector<T>.")]] Queue
-	{
-public:
-	explicit Queue(int size = 0)
-		{
-		constexpr int DEFAULT_CHUNK_SIZE = 10;
-		chunk_size = DEFAULT_CHUNK_SIZE;
-
-		head = tail = num_entries = 0;
-
-		if ( size < 0 )
-			{
-			entries = new T[1];
-			max_entries = 0;
-			}
-		else
-			{
-			if ( (entries = new T[chunk_size + 1]) )
-				max_entries = chunk_size;
-			else
-				{
-				entries = new T[1];
-				max_entries = 0;
-				}
-			}
-		}
-
-	~Queue() { delete[] entries; }
-
-	int length() const { return num_entries; }
-	int capacity() const { return max_entries; }
-	int resize(int new_size = 0) // 0 => size to fit current number of entries
-		{
-		if ( new_size < num_entries )
-			new_size = num_entries; // do not lose any entries
-
-		if ( new_size != max_entries )
-			{
-			// Note, allocate extra space, so that we can always
-			// use the [max_entries] element.
-			// ### Yin, why not use realloc()?
-			T* new_entries = new T[new_size + 1];
-
-			if ( new_entries )
-				{
-				if ( head <= tail )
-					memcpy(new_entries, entries + head, sizeof(T) * num_entries);
-				else
-					{
-					int len = num_entries - tail;
-					memcpy(new_entries, entries + head, sizeof(T) * len);
-					memcpy(new_entries + len, entries, sizeof(T) * tail);
-					}
-				delete[] entries;
-				entries = new_entries;
-				max_entries = new_size;
-				head = 0;
-				tail = num_entries;
-				}
-			else
-				{ // out of memory
-				}
-			}
-
-		return max_entries;
-		}
-
-	// remove all entries without delete[] entry
-	void clear() { head = tail = num_entries = 0; }
-
-	// helper functions for iterating over queue
-	T& front() { return entries[head]; }
-	T& back() { return entries[tail]; }
-	const T& front() const { return entries[head]; }
-	const T& back() const { return entries[tail]; }
-
-	void push_front(const T& a) // add in front of queue
-		{
-		if ( num_entries == max_entries )
-			{
-			resize(max_entries + chunk_size); // make more room
-			chunk_size *= 2;
-			}
-
-		++num_entries;
-		if ( head )
-			entries[--head] = a;
-		else
-			{
-			head = max_entries;
-			entries[head] = a;
-			}
-		}
-
-	void push_back(const T& a) // add at end of queue
-		{
-		if ( num_entries == max_entries )
-			{
-			resize(max_entries + chunk_size); // make more room
-			chunk_size *= 2;
-			}
-
-		++num_entries;
-		if ( tail < max_entries )
-			entries[tail++] = a;
-		else
-			{
-			entries[tail] = a;
-			tail = 0;
-			}
-		}
-
-	void pop_front()
-		{
-		--num_entries;
-		if ( head < max_entries )
-			head++;
-		else
-			head = 0;
-		}
-
-	void pop_back()
-		{
-		--num_entries;
-		if ( tail )
-			--tail;
-		else
-			tail = max_entries;
-		}
-
-	// return nth *PHYSICAL* entry of queue (do not remove)
-	T& operator[](int i) const { return entries[i]; }
-
-	// Type traits needed for some of the std algorithms to work
-	using value_type = T;
-	using pointer = T*;
-	using const_pointer = const T*;
-
-	// Iterator support
-	using iterator = pointer;
-	using const_iterator = const_pointer;
-	using reverse_iterator = std::reverse_iterator<iterator>;
-	using const_reverse_iterator = std::reverse_iterator<const_iterator>;
-
-	iterator begin() { return entries; }
-	iterator end() { return entries + num_entries; }
-	const_iterator begin() const { return entries; }
-	const_iterator end() const { return entries + num_entries; }
-	const_iterator cbegin() const { return entries; }
-	const_iterator cend() const { return entries + num_entries; }
-
-	reverse_iterator rbegin() { return reverse_iterator{end()}; }
-	reverse_iterator rend() { return reverse_iterator{begin()}; }
-	const_reverse_iterator rbegin() const { return const_reverse_iterator{end()}; }
-	const_reverse_iterator rend() const { return const_reverse_iterator{begin()}; }
-	const_reverse_iterator crbegin() const { return rbegin(); }
-	const_reverse_iterator crend() const { return rend(); }
-
-protected:
-	T* entries;
-	int chunk_size; // increase size by this amount when necessary
-	int max_entries; // entry's index range: 0 .. max_entries
-	int num_entries;
-	int head; // beginning of the queue in the ring
-	int tail; // just beyond the end of the queue in the ring
-	};
-
-template <typename T>
-using PQueue [[deprecated("Remove in v5.1. This class is deprecated (and is likely broken, see "
-                          "#1528). Use std::vector<T*>.")]] = Queue<T*>;
-
-	} // namespace zeek
diff --git a/src/RunState.cc b/src/RunState.cc
index 052a9ae39c..315ddcd24d 100644
--- a/src/RunState.cc
+++ b/src/RunState.cc
@@ -227,10 +227,7 @@ void dispatch_packet(Packet* pkt, iosource::PktSrc* pkt_src)
 		}
 
 	current_iosrc = pkt_src;
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 	current_pktsrc = pkt_src;
-#pragma GCC diagnostic pop
 
 	// network_time never goes back.
 	update_network_time(zeek::detail::timer_mgr->Time() < t ? t : zeek::detail::timer_mgr->Time());
@@ -273,10 +270,7 @@ void dispatch_packet(Packet* pkt, iosource::PktSrc* pkt_src)
 		first_wallclock = util::current_time(true);
 
 	current_iosrc = nullptr;
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 	current_pktsrc = nullptr;
-#pragma GCC diagnostic pop
 	}
 
 void run_loop()
diff --git a/src/Sessions.h b/src/Sessions.h
deleted file mode 100644
index 1720ff967a..0000000000
--- a/src/Sessions.h
+++ /dev/null
@@ -1,2 +0,0 @@
-#warning "This file is deprecated and will be removed in v5.1. Use session/Manager.h instead."
-#include "zeek/session/Manager.h"
diff --git a/src/Trigger.h b/src/Trigger.h
index 99e1bf3433..351377494e 100644
--- a/src/Trigger.h
+++ b/src/Trigger.h
@@ -89,19 +89,6 @@ public:
 	bool Cache(const void* obj, Val* val);
 	Val* Lookup(const void* obj);
 
-	[[deprecated(
-		"Remove in v5.1. Use Frame::GetTriggerAssoc() / const void* interface instead.")]] bool
-	Cache(const CallExpr* call, Val* val)
-		{
-		return Cache((const void*)call, val);
-		}
-	[[deprecated(
-		"Remove in v5.1. Use Frame::GetTriggerAssoc() / const void* interface instead.")]] Val*
-	Lookup(const CallExpr* call)
-		{
-		return Lookup((const void*)call);
-		}
-
 	// Disable this trigger completely. Needed because Unref'ing the trigger
 	// may not immediately delete it as other references may still exist.
 	void Disable();
diff --git a/src/Val.cc b/src/Val.cc
index 71f60e58c5..83dd413c08 100644
--- a/src/Val.cc
+++ b/src/Val.cc
@@ -3629,26 +3629,14 @@ void VectorVal::ValDescribe(ODesc* d) const
 	d->Add("]");
 	}
 
-ValPtr check_and_promote(ValPtr v, const TypePtr& t, bool is_init,
+ValPtr check_and_promote(ValPtr v, const TypePtr& new_type, bool is_init,
                          const detail::Location* expr_location)
-	{
-		// Once 5.0 comes out, this function can merge with the deprecated one below it, and this
-		// pragma block can go away.
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-	return check_and_promote(v, t.get(), is_init, expr_location);
-#pragma GCC diagnostic pop
-	}
-
-[[deprecated("Remove in v5.1. Use version that takes TypePtr instead.")]] ValPtr
-check_and_promote(ValPtr v, const Type* t, bool is_init, const detail::Location* expr_location)
 	{
 	if ( ! v )
 		return nullptr;
 
 	Type* vt = flatten_type(v->GetType().get());
-	t = flatten_type(t);
-
+	Type* t = flatten_type(new_type.get());
 	TypeTag t_tag = t->Tag();
 	TypeTag v_tag = vt->Tag();
 
diff --git a/src/Val.h b/src/Val.h
index 080278b045..9ad33c5a6b 100644
--- a/src/Val.h
+++ b/src/Val.h
@@ -1706,11 +1706,8 @@ UNDERLYING_ACCESSOR_DEF(TypeVal, zeek::Type*, AsType)
 // exact match, returns it.  If promotable, returns the promoted version.
 // If not a match, generates an error message and return nil.  If is_init is
 // true, then the checking is done in the context of an initialization.
-extern ValPtr check_and_promote(ValPtr v, const TypePtr& t, bool is_init,
+extern ValPtr check_and_promote(ValPtr v, const TypePtr& new_type, bool is_init,
                                 const detail::Location* expr_location = nullptr);
-[[deprecated("Remove in v5.1. Use version that takes TypePtr instead.")]] extern ValPtr
-check_and_promote(ValPtr v, const Type* t, bool is_init,
-                  const detail::Location* expr_location = nullptr);
 
 extern bool same_val(const Val* v1, const Val* v2);
 extern bool same_atomic_val(const Val* v1, const Val* v2);
diff --git a/src/session/Manager.cc b/src/session/Manager.cc
index 1316fdbcfd..565d1eb49f 100644
--- a/src/session/Manager.cc
+++ b/src/session/Manager.cc
@@ -25,7 +25,6 @@
 #include "zeek/telemetry/Manager.h"
 
 zeek::session::Manager* zeek::session_mgr = nullptr;
-zeek::session::Manager*& zeek::sessions = zeek::session_mgr;
 
 namespace zeek::session
 	{
@@ -287,9 +286,4 @@ void Manager::InsertSession(detail::Key key, Session* session)
 		}
 	}
 
-zeek::detail::PacketFilter* Manager::GetPacketFilter(bool init)
-	{
-	return packet_mgr->GetPacketFilter(init);
-	}
-
 	} // namespace zeek::session
diff --git a/src/session/Manager.h b/src/session/Manager.h
index 1160e2794a..624e816c1e 100644
--- a/src/session/Manager.h
+++ b/src/session/Manager.h
@@ -89,9 +89,6 @@ public:
 	void Weird(const char* name, const Packet* pkt, const char* addl = "", const char* source = "");
 	void Weird(const char* name, const IP_Hdr* ip, const char* addl = "");
 
-	[[deprecated("Remove in v5.1. Use packet_mgr->GetPacketFilter().")]] zeek::detail::PacketFilter*
-	GetPacketFilter(bool init = true);
-
 	unsigned int CurrentSessions() { return session_map.size(); }
 
 private:
@@ -113,8 +110,4 @@ private:
 // Manager for the currently active sessions.
 extern session::Manager* session_mgr;
 
-extern session::Manager*& sessions
-	[[deprecated("Remove in v5.1. Use zeek::sessions::session_mgr.")]];
-using NetSessions [[deprecated("Remove in v5.1. Use zeek::session::Manager.")]] = session::Manager;
-
 	} // namespace zeek
diff --git a/src/util.cc b/src/util.cc
index 02c4b0dbbe..8e8cce8fda 100644
--- a/src/util.cc
+++ b/src/util.cc
@@ -2523,11 +2523,6 @@ void zeek_strerror_r(int zeek_errno, char* buf, size_t buflen)
 	strerror_r_helper(res, buf, buflen);
 	}
 
-char* zeekenv(const char* name)
-	{
-	return getenv(name);
-	}
-
 static string json_escape_byte(char c)
 	{
 	char hex[2] = {'0', '0'};
diff --git a/src/util.h b/src/util.h
index af1fa3646c..13c502583c 100644
--- a/src/util.h
+++ b/src/util.h
@@ -547,12 +547,6 @@ std::string canonify_name(const std::string& name);
  */
 void zeek_strerror_r(int zeek_errno, char* buf, size_t buflen);
 
-/**
- * A wrapper function for getenv().  Helps check for existence of
- * legacy environment variable names that map to the latest \a name.
- */
-[[deprecated("Remove in v5.1.  Use getenv() directly.")]] char* zeekenv(const char* name);
-
 /**
  * Escapes bytes in a string that are not valid UTF8 characters with \xYY format. Used
  * by the JSON writer and BIF methods.
diff --git a/testing/btest/plugins/packet-protocol-plugin/src/LLCDemo.cc b/testing/btest/plugins/packet-protocol-plugin/src/LLCDemo.cc
index ad3da0c561..3259e0ea34 100644
--- a/testing/btest/plugins/packet-protocol-plugin/src/LLCDemo.cc
+++ b/testing/btest/plugins/packet-protocol-plugin/src/LLCDemo.cc
@@ -16,7 +16,7 @@ bool LLCDemo::AnalyzePacket(size_t len, const uint8_t* data, Packet* packet)
 	// Rudimentary parsing of 802.2 LLC
 	if ( 17 >= len )
 		{
-		sessions->Weird("truncated_llc_header", packet);
+		session_mgr->Weird("truncated_llc_header", packet);
 		return false;
 		}
 
diff --git a/testing/btest/plugins/packet-protocol-plugin/src/RawLayer.cc b/testing/btest/plugins/packet-protocol-plugin/src/RawLayer.cc
index 36c3b253e4..014177910f 100644
--- a/testing/btest/plugins/packet-protocol-plugin/src/RawLayer.cc
+++ b/testing/btest/plugins/packet-protocol-plugin/src/RawLayer.cc
@@ -17,7 +17,7 @@ bool RawLayer::AnalyzePacket(size_t len, const uint8_t* data, Packet* packet)
 	constexpr auto layer_size = 21;
 	if ( layer_size >= len )
 		{
-		sessions->Weird("truncated_raw_layer", packet);
+		session_mgr->Weird("truncated_raw_layer", packet);
 		return false;
 		}
 
diff --git a/zeek-config.in b/zeek-config.in
index a25449ff04..e6ac279c3b 100755
--- a/zeek-config.in
+++ b/zeek-config.in
@@ -4,7 +4,6 @@ binpac_root=@ZEEK_CONFIG_BINPAC_ROOT_DIR@
 broker_root=@ZEEK_CONFIG_BROKER_ROOT_DIR@
 btest_tools_dir=@ZEEK_CONFIG_BTEST_TOOLS_DIR@
 build_type=@CMAKE_BUILD_TYPE_LOWER@
-caf_root=@ZEEK_CONFIG_CAF_ROOT_DIR@
 cmake_dir=@CMAKE_INSTALL_PREFIX@/share/zeek/cmake
 config_dir=@ZEEK_ETC_INSTALL_DIR@
 include_dir=@CMAKE_INSTALL_PREFIX@/include
@@ -65,7 +64,6 @@ Toplevel installation directories for third-party components:
 
   --binpac_root         BinPAC compiler
   --broker_root         Broker communication framework
-  --caf_root            C++ Actor Framework (deprecated, will be removed in 5.1)
 "
 }
 
@@ -99,9 +97,6 @@ while [ $# -ne 0 ]; do
         --build_type)
             echo $build_type
             ;;
-        --caf_root)
-            echo "The caf_root option is deprecated and will be removed in 5.1. The Broker API has been updated to no longer require access to CAF to build against Broker."
-            ;;
         --cmake_dir)
             echo $cmake_dir
             ;;